Author Topic: Reducing Gain of Circuit  (Read 4623 times)

eddie_bowers

Reducing Gain of Circuit
« on: March 15, 2010, 05:07:07 PM »
I have built this a few times and it works well, but I was needing to build something based on it with less gain, so I started trying to understand how it works.
Now i'm a bit confused about the whole bootstrapping part of the circuit.
Normally there is a voltage devider for bias on the base, but instead of that we have a 100k and 47k devider and then 10k to the base.  And that is also connected to the emmiter via the 22mf cap.
Is that serving as a feedback loop similar to the way an op-am works?

-Eddie

aron

Re: Reducing Gain of Circuit
« Reply #1 on: March 15, 2010, 06:11:29 PM »
Here's what I have on this. Now, the easiest way to reduce the gain is to simply replace the 100K from signal to ground with a voltage divider (or pot).

http://www.diystompboxes.com/smfforum/index.php?topic=2540.0

aron

Re: Reducing Gain of Circuit
« Reply #2 on: March 15, 2010, 07:05:28 PM »
Here's a tutorial just to have around:

http://www.electronics-tutorials.ws/amplifier/amp_2.html

eddie_bowers

Re: Reducing Gain of Circuit
« Reply #3 on: March 15, 2010, 07:42:37 PM »
Thats what I needed (especially the bootstrap info)
Thanks,
-Eddie