Simple Preamp Circuit Needed

D

Dave.H

Guest
I've been looking for a simple (preferably 1 or 2 transistors or IC
based) preamp to go between the LM380 amp I mentioned in an earlier
post, and a regen radio. I've searched Google and only came up with
circuits that are too complicated for me (only have basic electronic
skills). I found one at Jaycar electronics, but would prefer to roll
my own. Any help on this is appreciated.

Thanks
Dave
Australia
 
On Jun 8, 5:16 am, "Richard Seriani" <richard_s...@cox.net> wrote:
"Dave.H" <the19...@googlemail.com> wrote in message

news:d09de802-06f9-4eda-95e9-2da9a7535969@z24g2000prf.googlegroups.com...

I've been looking for a simple (preferably 1 or 2 transistors or IC
based) preamp to go between the LM380 amp I mentioned in an earlier
post, and a regen radio. I've searched Google and only came up with
circuits that are too complicated for me (only have basic electronic
skills). I found one at Jaycar electronics, but would prefer to roll
my own. Any help on this is appreciated.

Thanks
Dave
Australia

First hit on google search for transistor preamp. Appears to be pretty basic
and would likely rank as beginner material.http://www.uoguelph.ca/~antoon/circ/amp1.htm

One that explains the design of another one (I haven't read this, so I can't
vouch for accuracy):http://www.rason.org/Projects/bipolamp/bipolamp.htm

Many, many, many more.

Good luck,
Richard
Click to expand...
I came across the first one, but as it uses an electret microphone, I
passed it by. Would it be OK to connect my regen radio and crystal
radio to it instead of the electret microphone?

Thanks
Dave
Australia
 
On Jun 8, 4:42 am, "Dave.H" <the19...@googlemail.com> wrote:
On Jun 8, 5:16 am, "Richard Seriani" <richard_s...@cox.net> wrote:





"Dave.H" <the19...@googlemail.com> wrote in message

news:d09de802-06f9-4eda-95e9-2da9a7535969@z24g2000prf.googlegroups.com...

I've been looking for a simple (preferably 1 or 2 transistors or IC
based) preamp to go between the LM380 amp I mentioned in an earlier
post, and a regen radio.  I've searched Google and only came up with
circuits that are too complicated for me (only have basic electronic
skills).  I found one at Jaycar electronics, but would prefer to roll
my own. Any help on this is appreciated.

Thanks
Dave
Australia

First hit on google search for transistor preamp. Appears to be pretty basic
and would likely rank as beginner material.http://www.uoguelph.ca/~antoon/circ/amp1.htm

One that explains the design of another one (I haven't read this, so I can't
vouch for accuracy):http://www.rason.org/Projects/bipolamp/bipolamp.htm

Many, many, many more.

Good luck,
Richard

I came across the first one, but as it uses an electret microphone, I
passed it by.  Would it be OK to connect my regen radio and crystal
radio to it instead of the electret microphone?

Thanks
Dave
Australia- Hide quoted text -

- Show quoted text -
Click to expand...
May be the audio section of this web site is helpful:
http://www.zen22142.zen.co.uk/Circuits/Audio/audio.html

It has an ECM mic preamp, headphone preamp, HiFi preamp and a low
voltage preamp. Just take your own pick and see which is suitable for
you.

cheers,

Allen
 
On Jun 8, 7:19 pm, Allen Bong <allenbsf6...@gmail.com> wrote:
On Jun 8, 4:42 am, "Dave.H" <the19...@googlemail.com> wrote:



On Jun 8, 5:16 am, "Richard Seriani" <richard_s...@cox.net> wrote:

"Dave.H" <the19...@googlemail.com> wrote in message

news:d09de802-06f9-4eda-95e9-2da9a7535969@z24g2000prf.googlegroups.com...

I've been looking for a simple (preferably 1 or 2 transistors or IC
based) preamp to go between the LM380 amp I mentioned in an earlier
post, and a regen radio. I've searched Google and only came up with
circuits that are too complicated for me (only have basic electronic
skills). I found one at Jaycar electronics, but would prefer to roll
my own. Any help on this is appreciated.

Thanks
Dave
Australia

First hit on google search for transistor preamp. Appears to be pretty basic
and would likely rank as beginner material.http://www.uoguelph.ca/~antoon/circ/amp1.htm

One that explains the design of another one (I haven't read this, so I can't
vouch for accuracy):http://www.rason.org/Projects/bipolamp/bipolamp.htm

Many, many, many more.

Good luck,
Richard

I came across the first one, but as it uses an electret microphone, I
passed it by. Would it be OK to connect my regen radio and crystal
radio to it instead of the electret microphone?

Thanks
Dave
Australia- Hide quoted text -

- Show quoted text -

May be the audio section of this web site is helpful:http://www.zen22142.zen.co.uk/Circuits/Audio/audio.html

It has an ECM mic preamp, headphone preamp, HiFi preamp and a low
voltage preamp. Just take your own pick and see which is suitable for
you.

cheers,

Allen
Click to expand...
Think I might go with this one, http://www.zen22142.zen.co.uk/Circuits/Audio/lvpreamp.htm
with two BC549 transistors.
Since it has no input/output labels, I'm assuming the input connection
is the 1.0 uF connected to the 1k resistor, and the output the 10 uF
connected to the emitter of T1. Looks like my soldering iron will be
warming up again soon.

Thanks
Dave
 
On Jun 7, 2:42 pm, "Dave.H" <the19...@googlemail.com> wrote:
On Jun 8, 5:16 am, "Richard Seriani" <richard_s...@cox.net> wrote:



"Dave.H" <the19...@googlemail.com> wrote in message

news:d09de802-06f9-4eda-95e9-2da9a7535969@z24g2000prf.googlegroups.com...

I've been looking for a simple (preferably 1 or 2 transistors or IC
based) preamp to go between the LM380 amp I mentioned in an earlier
post, and a regen radio. I've searched Google and only came up with
circuits that are too complicated for me (only have basic electronic
skills). I found one at Jaycar electronics, but would prefer to roll
my own. Any help on this is appreciated.

Thanks
Dave
Australia

First hit on google search for transistor preamp. Appears to be pretty basic
and would likely rank as beginner material.http://www.uoguelph.ca/~antoon/circ/amp1.htm

One that explains the design of another one (I haven't read this, so I can't
vouch for accuracy):http://www.rason.org/Projects/bipolamp/bipolamp.htm

Many, many, many more.

Good luck,
Richard

I came across the first one, but as it uses an electret microphone, I
passed it by. Would it be OK to connect my regen radio and crystal
radio to it instead of the electret microphone?

Thanks
Dave
Australia
Click to expand...
Just remove the electret from the circuit, as well as the leftmost 10k
resistor (it is just there to power the electret mic). Then your input
will be between ground and the cap that goes to the base of the
transistor.

Sri Bodhi Prana
 
On Jun 8, 8:44 pm, "Dave.H" <the19...@googlemail.com> wrote:
On Jun 8, 7:19 pm, Allen Bong <allenbsf6...@gmail.com> wrote:





On Jun 8, 4:42 am, "Dave.H" <the19...@googlemail.com> wrote:

On Jun 8, 5:16 am, "Richard Seriani" <richard_s...@cox.net> wrote:

"Dave.H" <the19...@googlemail.com> wrote in message

news:d09de802-06f9-4eda-95e9-2da9a7535969@z24g2000prf.googlegroups.com...

I've been looking for a simple (preferably 1 or 2 transistors or IC
based) preamp to go between the LM380 amp I mentioned in an earlier
post, and a regen radio.  I've searched Google and only came up with
circuits that are too complicated for me (only have basic electronic
skills).  I found one at Jaycar electronics, but would prefer to roll
my own. Any help on this is appreciated.

Thanks
Dave
Australia

First hit on google search for transistor preamp. Appears to be pretty basic
and would likely rank as beginner material.http://www.uoguelph.ca/~antoon/circ/amp1.htm

One that explains the design of another one (I haven't read this, so I can't
vouch for accuracy):http://www.rason.org/Projects/bipolamp/bipolamp.htm

Many, many, many more.

Good luck,
Richard

I came across the first one, but as it uses an electret microphone, I
passed it by.  Would it be OK to connect my regen radio and crystal
radio to it instead of the electret microphone?

Thanks
Dave
Australia- Hide quoted text -

- Show quoted text -

May be the audio section of this web site is helpful:http://www.zen22142..zen.co.uk/Circuits/Audio/audio.html

It has an ECM mic preamp, headphone preamp, HiFi preamp and a low
voltage preamp.  Just take your own pick and see which is suitable for
you.

cheers,

Allen

Think I might go with this one,http://www.zen22142.zen.co.uk/Circuits/Audio/lvpreamp.htm
with two BC549 transistors.
Since it has no input/output labels, I'm assuming the input connection
is the 1.0 uF connected to the 1k resistor, and the output the 10 uF
connected to the emitter of T1. Looks like my soldering iron will be
warming up again soon.

Thanks
Dave- Hide quoted text -

- Show quoted text -
Click to expand...
That should be right. I remember when I started electronics in high
school, we couldn't afford and don't know how to make a PCB, so we
ended up getting some bronze wood screws and screwed them onto a piece
of plywood. The transistors and transformers were soldered directly
onto the screws. I remember the transistors were 2SB54 and 2SB56
germinium. That's how we started with out first 3-transistor audio
amplifier. Never heard of LED that time !!

Allen
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top