D
default
Guest
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
--
sine wave when a pulse is applied? to emulate a bell sound
--
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J
Jamie
Guest
default wrote:
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
D
default
Guest
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
--
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
--
K
krw@att.bizzzzzzzzzzzz
Guest
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net> wrote:
If you've got a PIC, why not use it?On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
D
default
Guest
On Sat, 05 Jun 2010 10:55:09 -0500, "krw@att.bizzzzzzzzzzzz"
<krw@att.bizzzzzzzzzzzz> wrote:
the chip expanded to 12) to operate solenoids to strike chimes. Pics
don't make sine waves very well without a lot of extra effort. The
end goal is a mechanical chime system that can be programmed for
different melodies.
I have a goal in mind, I'm not interested in changing the goal, and
this is just a little side excursion to aid in testing.
--
<krw@att.bizzzzzzzzzzzz> wrote:
The pic is just putting out de multiplexed pulses (only 4 outputs onOn Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net> wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
If you've got a PIC, why not use it?
the chip expanded to 12) to operate solenoids to strike chimes. Pics
don't make sine waves very well without a lot of extra effort. The
end goal is a mechanical chime system that can be programmed for
different melodies.
I have a goal in mind, I'm not interested in changing the goal, and
this is just a little side excursion to aid in testing.
--
J
John Larkin
Guest
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net>
wrote:
damped-ringing LC resonators. A single one didn't sound very
bell-like. Turns out that bells have a number of nearby resonant
modes, each with not-quite harmonics. Complex.
The thing I did drove loudspeakers in the bow of a ship to go
bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have
to stand there all night whacking a bell.
Why not use the PIC and a dac? The code would be interesting.
John
wrote:
I did a bell simulator once, but I used several, three or four,On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
damped-ringing LC resonators. A single one didn't sound very
bell-like. Turns out that bells have a number of nearby resonant
modes, each with not-quite harmonics. Complex.
The thing I did drove loudspeakers in the bow of a ship to go
bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have
to stand there all night whacking a bell.
Why not use the PIC and a dac? The code would be interesting.
John
K
krw@att.bizzzzzzzzzzzz
Guest
On Sat, 05 Jun 2010 12:59:28 -0400, default <default@defaulter.net> wrote:
chimes. Even a PIC oughta be able to handle that.
building hardware, to be thrown away.
If all you're doing is debugging (getting the timing right), just PWM theOn Sat, 05 Jun 2010 10:55:09 -0500, "krw@att.bizzzzzzzzzzzz"
krw@att.bizzzzzzzzzzzz> wrote:
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net> wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
If you've got a PIC, why not use it?
The pic is just putting out de multiplexed pulses (only 4 outputs on
the chip expanded to 12) to operate solenoids to strike chimes. Pics
don't make sine waves very well without a lot of extra effort. The
end goal is a mechanical chime system that can be programmed for
different melodies.
chimes. Even a PIC oughta be able to handle that.
Right, so use the PIC, then throw away the code. It's often easier thanI have a goal in mind, I'm not interested in changing the goal, and
this is just a little side excursion to aid in testing.
building hardware, to be thrown away.
W
whit3rd
Guest
On Jun 5, 5:42 am, default <defa...@defaulter.net> wrote:
sine waves), with damping times of 1, 1/3, 1/5 respectively.
It can be done with three LC sections and some buffer amplification,
for the speaker drive.
A good bell sound takes the first, third, and fifth harmonics (threeCan someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
sine waves), with damping times of 1, 1/3, 1/5 respectively.
It can be done with three LC sections and some buffer amplification,
for the speaker drive.
D
David Eather
Guest
On 5/06/2010 11:54 PM, Jamie wrote:
get what you want
If you reduce the gain of the amplifier portion of the circuit you willdefault wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how ever,
that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
get what you want
J
Jasen Betts
Guest
On 2010-06-05, default <default@defaulter.net> wrote:
from a 1000uF capacitor. it made a gong-like sound if you charged the
capacitor and then used the capacitor to power the circuit.
--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
I once powered a CD4047 based oscilator driving a 50 ohm speakerCan someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
from a 1000uF capacitor. it made a gong-like sound if you charged the
capacitor and then used the capacitor to power the circuit.
--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
D
default
Guest
On Sat, 05 Jun 2010 12:17:03 -0500, "krw@att.bizzzzzzzzzzzz"
<krw@att.bizzzzzzzzzzzz> wrote:
three). frequency constant (although the harmonic mix may change as
it rings) with the amplitude decreasing.
Sine wave is necessary for a good (clean) sound.
figure I might just keep the test set and use it as a unique doorbell.
Who wants to listen to boring Westminster chimes when you can have
something like "Pictures at an Exhibition?" or something different
each time it is used?
The ultimate goal is not to make noise - but to drive actual chime
bars mechanically. I'm finding home-made strikers more of a challenge
than I thought they would be.
--
<krw@att.bizzzzzzzzzzzz> wrote:
It'll do pwm easily. A bell is a decaying sine wave (or two orOn Sat, 05 Jun 2010 12:59:28 -0400, default <default@defaulter.net> wrote:
On Sat, 05 Jun 2010 10:55:09 -0500, "krw@att.bizzzzzzzzzzzz"
krw@att.bizzzzzzzzzzzz> wrote:
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net> wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
If you've got a PIC, why not use it?
The pic is just putting out de multiplexed pulses (only 4 outputs on
the chip expanded to 12) to operate solenoids to strike chimes. Pics
don't make sine waves very well without a lot of extra effort. The
end goal is a mechanical chime system that can be programmed for
different melodies.
If all you're doing is debugging (getting the timing right), just PWM the
chimes. Even a PIC oughta be able to handle that.
three). frequency constant (although the harmonic mix may change as
it rings) with the amplitude decreasing.
Sine wave is necessary for a good (clean) sound.
Yeah I guess. The project is intended for a specific purpose, but II have a goal in mind, I'm not interested in changing the goal, and
this is just a little side excursion to aid in testing.
Right, so use the PIC, then throw away the code. It's often easier than
building hardware, to be thrown away.
figure I might just keep the test set and use it as a unique doorbell.
Who wants to listen to boring Westminster chimes when you can have
something like "Pictures at an Exhibition?" or something different
each time it is used?
The ultimate goal is not to make noise - but to drive actual chime
bars mechanically. I'm finding home-made strikers more of a challenge
than I thought they would be.
--
D
default
Guest
On Sat, 05 Jun 2010 10:06:01 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
strike one while another is still ringing down)
To get the timing for the music I thought a little excursion into
electronic bells would be helpful, because the mechanical parts are
unwieldy, and I haven't committed to a mechanical design I'm satisfied
with - then I thought this might also make a killer doorbell . . . a
bit of "mission creep" is setting in.
--
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
bells (twelve, with the ability to strike 2-4 at the same time, orOn Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net
wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
I did a bell simulator once, but I used several, three or four,
damped-ringing LC resonators. A single one didn't sound very
bell-like. Turns out that bells have a number of nearby resonant
modes, each with not-quite harmonics. Complex.
The thing I did drove loudspeakers in the bow of a ship to go
bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have
to stand there all night whacking a bell.
Why not use the PIC and a dac? The code would be interesting.
John
I want the finished product to have mechanical chimes, the electronic
strike one while another is still ringing down)
To get the timing for the music I thought a little excursion into
electronic bells would be helpful, because the mechanical parts are
unwieldy, and I haven't committed to a mechanical design I'm satisfied
with - then I thought this might also make a killer doorbell . . . a
bit of "mission creep" is setting in.
--
D
default
Guest
On Sun, 06 Jun 2010 07:04:50 +1000, David Eather <eather@tpg.com.au>
wrote:
a little L-C massaging on the output it doesn't sound bad, but it is
too much hardware. Seems to me, back in the day, they used single
twin T oscillators to get the sounds of drums, base drum and tom-tom,
as well as bells from fairly simple one transistor circuits.
--
wrote:
Yeah. I tried that with a square wave and fet amplitude control, withOn 5/06/2010 11:54 PM, Jamie wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how ever,
that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
If you reduce the gain of the amplifier portion of the circuit you will
get what you want
a little L-C massaging on the output it doesn't sound bad, but it is
too much hardware. Seems to me, back in the day, they used single
twin T oscillators to get the sounds of drums, base drum and tom-tom,
as well as bells from fairly simple one transistor circuits.
--
D
default
Guest
On Sat, 5 Jun 2010 10:09:05 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:
--
wrote:
A good bell sound is made with large heavy pieces of metal.On Jun 5, 5:42 am, default <defa...@defaulter.net> wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
A good bell sound takes the first, third, and fifth harmonics (three
sine waves), with damping times of 1, 1/3, 1/5 respectively.
It can be done with three LC sections and some buffer amplification,
for the speaker drive.
--
K
krw@att.bizzzzzzzzzzzz
Guest
On Sun, 06 Jun 2010 08:19:20 -0400, default <default@defaulter.net> wrote:
If the PWM frequency is high enough... Store the waveform, if need be.
Nonsense. You said you needed this for debug. It doesn't need to be perfect.On Sat, 05 Jun 2010 12:17:03 -0500, "krw@att.bizzzzzzzzzzzz"
krw@att.bizzzzzzzzzzzz> wrote:
On Sat, 05 Jun 2010 12:59:28 -0400, default <default@defaulter.net> wrote:
On Sat, 05 Jun 2010 10:55:09 -0500, "krw@att.bizzzzzzzzzzzz"
krw@att.bizzzzzzzzzzzz> wrote:
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net> wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
If you've got a PIC, why not use it?
The pic is just putting out de multiplexed pulses (only 4 outputs on
the chip expanded to 12) to operate solenoids to strike chimes. Pics
don't make sine waves very well without a lot of extra effort. The
end goal is a mechanical chime system that can be programmed for
different melodies.
If all you're doing is debugging (getting the timing right), just PWM the
chimes. Even a PIC oughta be able to handle that.
It'll do pwm easily. A bell is a decaying sine wave (or two or
three). frequency constant (although the harmonic mix may change as
it rings) with the amplitude decreasing.
Sine wave is necessary for a good (clean) sound.
If the PWM frequency is high enough... Store the waveform, if need be.
I'd rather hear nothing, but a simple "bong" beats them all.I have a goal in mind, I'm not interested in changing the goal, and
this is just a little side excursion to aid in testing.
Right, so use the PIC, then throw away the code. It's often easier than
building hardware, to be thrown away.
Yeah I guess. The project is intended for a specific purpose, but I
figure I might just keep the test set and use it as a unique doorbell.
Who wants to listen to boring Westminster chimes when you can have
something like "Pictures at an Exhibition?" or something different
each time it is used?
The ultimate goal is not to make noise - but to drive actual chime
bars mechanically. I'm finding home-made strikers more of a challenge
than I thought they would be.
J
john jardine
Guest
"default" <default@defaulter.net> wrote in message
news:9dhk06dltvk703cdpri3dt91bvjnbjr6cf@4ax.com...
| |5V
.-. -
| | ---
| |4k7 |
'-' ===
| GND
,-----------------------------o-----o
| | | Damped Sine
| .-.1M o-------o Out
| | | | -> ~1Vpp
| | | |
| 10k 10k '-' |
| ___ ___ || | |/
o---|___|---o--|___|--o--||---o---| BC547
| | | || |>
| --- | 10u |
| ---100n | o------
| | | | |
| === | | ---
| || || | | --- 10u
'----||-----o----||---' | |
|| | || .-. |
10n .-. 10n | | .-."Q"Pot
| | | | | |<-.
| | '-' | | |220
'-'1k 1k | '-' |
-> | | | |
PIC o------------' === === ===
Narrow Pulse GND GND GND
to Ring
(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
news:9dhk06dltvk703cdpri3dt91bvjnbjr6cf@4ax.com...
,---------,Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
--
| |5V
.-. -
| | ---
| |4k7 |
'-' ===
| GND
,-----------------------------o-----o
| | | Damped Sine
| .-.1M o-------o Out
| | | | -> ~1Vpp
| | | |
| 10k 10k '-' |
| ___ ___ || | |/
o---|___|---o--|___|--o--||---o---| BC547
| | | || |>
| --- | 10u |
| ---100n | o------
| | | | |
| === | | ---
| || || | | --- 10u
'----||-----o----||---' | |
|| | || .-. |
10n .-. 10n | | .-."Q"Pot
| | | | | |<-.
| | '-' | | |220
'-'1k 1k | '-' |
-> | | | |
PIC o------------' === === ===
Narrow Pulse GND GND GND
to Ring
(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
J
John Larkin
Guest
On Sun, 06 Jun 2010 08:41:19 -0400, default <default@defaulter.net>
wrote:
tons of suitable software around.
John
wrote:
To simulate the chimes, why not a PC with a sound card? There must beOn Sat, 05 Jun 2010 10:06:01 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net
wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
I did a bell simulator once, but I used several, three or four,
damped-ringing LC resonators. A single one didn't sound very
bell-like. Turns out that bells have a number of nearby resonant
modes, each with not-quite harmonics. Complex.
The thing I did drove loudspeakers in the bow of a ship to go
bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have
to stand there all night whacking a bell.
Why not use the PIC and a dac? The code would be interesting.
John
I want the finished product to have mechanical chimes, the electronic
bells (twelve, with the ability to strike 2-4 at the same time, or
strike one while another is still ringing down)
To get the timing for the music I thought a little excursion into
electronic bells would be helpful, because the mechanical parts are
unwieldy, and I haven't committed to a mechanical design I'm satisfied
with - then I thought this might also make a killer doorbell . . . a
bit of "mission creep" is setting in.
tons of suitable software around.
John
K
krw@att.bizzzzzzzzzzzz
Guest
On Sun, 06 Jun 2010 10:14:04 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
MP3 player.On Sun, 06 Jun 2010 08:41:19 -0400, default <default@defaulter.net
wrote:
On Sat, 05 Jun 2010 10:06:01 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net
wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
I did a bell simulator once, but I used several, three or four,
damped-ringing LC resonators. A single one didn't sound very
bell-like. Turns out that bells have a number of nearby resonant
modes, each with not-quite harmonics. Complex.
The thing I did drove loudspeakers in the bow of a ship to go
bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have
to stand there all night whacking a bell.
Why not use the PIC and a dac? The code would be interesting.
John
I want the finished product to have mechanical chimes, the electronic
bells (twelve, with the ability to strike 2-4 at the same time, or
strike one while another is still ringing down)
To get the timing for the music I thought a little excursion into
electronic bells would be helpful, because the mechanical parts are
unwieldy, and I haven't committed to a mechanical design I'm satisfied
with - then I thought this might also make a killer doorbell . . . a
bit of "mission creep" is setting in.
To simulate the chimes, why not a PC with a sound card? There must be
tons of suitable software around.
D
default
Guest
On Sun, 06 Jun 2010 10:14:04 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
A PC for a door bell is overkill - and the real thing will be
mechanical that is a design goal.
--
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
On Sun, 06 Jun 2010 08:41:19 -0400, default <default@defaulter.net
wrote:
On Sat, 05 Jun 2010 10:06:01 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
On Sat, 05 Jun 2010 10:49:18 -0400, default <default@defaulter.net
wrote:
On Sat, 05 Jun 2010 09:54:04 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
default wrote:
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
Damped? Do you mean compressed to a sequare wave?
You can do a 180 degree phase shift in a double T RC network how
ever, that produces a sine wave. etc..
Feed back --||---+---||----+---||-----Base of tranny..
| |
| |
R R
| |
com com
ect.
Damped as in decaying, just like a bell.
Seems to me John Larkin or Jim Thompson posted something like this a
long time ago. Searching didn't find exactly what I want. I'm
building a set of mechanical chimes but wanted something to use until
I work out the kinks - and test the pic timing.
I did a bell simulator once, but I used several, three or four,
damped-ringing LC resonators. A single one didn't sound very
bell-like. Turns out that bells have a number of nearby resonant
modes, each with not-quite harmonics. Complex.
The thing I did drove loudspeakers in the bow of a ship to go
bong-bong-bong every 30 seconds in the fog, so a crew guy didn't have
to stand there all night whacking a bell.
Why not use the PIC and a dac? The code would be interesting.
John
I want the finished product to have mechanical chimes, the electronic
bells (twelve, with the ability to strike 2-4 at the same time, or
strike one while another is still ringing down)
To get the timing for the music I thought a little excursion into
electronic bells would be helpful, because the mechanical parts are
unwieldy, and I haven't committed to a mechanical design I'm satisfied
with - then I thought this might also make a killer doorbell . . . a
bit of "mission creep" is setting in.
To simulate the chimes, why not a PC with a sound card? There must be
tons of suitable software around.
John
I don't want to simulate, I want hardware making sound.
A PC for a door bell is overkill - and the real thing will be
mechanical that is a design goal.
--
D
default
Guest
On Sun, 6 Jun 2010 18:05:57 +0100, "john jardine"
<zen177928@zen.co.uk> wrote:
I'll give it a try
--
<zen177928@zen.co.uk> wrote:
"default" <default@defaulter.net> wrote in message
news:9dhk06dltvk703cdpri3dt91bvjnbjr6cf@4ax.com...
Can someone supply a single transistor circuit that will give a damped
sine wave when a pulse is applied? to emulate a bell sound
--
,---------,
| |5V
.-. -
| | ---
| |4k7 |
'-' ===
| GND
,-----------------------------o-----o
| | | Damped Sine
| .-.1M o-------o Out
| | | | -> ~1Vpp
| | | |
| 10k 10k '-' |
| ___ ___ || | |/
o---|___|---o--|___|--o--||---o---| BC547
| | | || |
| --- | 10u |
| ---100n | o------
| | | | |
| === | | ---
| || || | | --- 10u
'----||-----o----||---' | |
|| | || .-. |
10n .-. 10n | | .-."Q"Pot
| | | | | |<-.
| | '-' | | |220
'-'1k 1k | '-' |
-> | | | |
PIC o------------' === === ===
Narrow Pulse GND GND GND
to Ring
(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
Thanks
I'll give it a try
--