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Sorry. I thought you wanted to electronically simulate the soundsOn Sun, 06 Jun 2010 10:14:04 -0700, John Larkin
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..
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R R
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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.
Don't use the amplitude control. set it with a pot and then leave it alone.On Sun, 06 Jun 2010 07:04:50 +1000, David Eather<eather@tpg.com.au
wrote:
On 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
Yeah. I tried that with a square wave and fet amplitude control, with
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.
write a simulator that produces ABC or MIDI format(etc) and renderI 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)
Point away from the bit you want to see and zoom out. (or use theI use spice as a sanity check. Sometimes it even finds some.
LTSpice is also nice for making a schematic to email to someone.
It is just about the only portable schematic format the industry has
ever seen. Not a bad editor, but the circuits seem to wander all over
the screen as you zoom. I have to keep selecting my whole circuit and
dragging it back into sight.