[sdiy] Try again, 100k was off in the diagram... RE: Circuit purpose?

David Ingebretsen dingebre at 3dphysics.net
Tue Mar 18 03:00:10 CET 2014


Well, the 100k should have been further to the right, dang font...

Try again.

>> 
>>                          +              680R             +
>> OP-AMP  >--------| |------/\/\/\/------| |--------------->output
>>
|
>>
\
>>
/
>>
\    100k
>>
/
>>
|
>>
|
>>
----
>>
--    GND







David

>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>> bounces at dropmix.xs4all.nl] On Behalf Of David Ingebretsen
>> Sent: Monday, March 17, 2014 7:23 PM
>> To: Synth-diy at dropmix.xs4all.nl
>> Subject: [sdiy] Circuit purpose?
>> 
>> I've run across a circuit bit a couple of times now that follows the
output of
>> an op-amp, and I don't understand its purpose. It consists of two 10uF
>> electrolytic capacitors connected negative to negative with a 680 ohm
>> resistor between the two negative sides of the capacitors. There is then
a
>> 100k resistor on the positive side of the output capacitor to ground.
>> 
>>                          +              680R             +
>> OP-AMP  >--------| |------/\/\/\/------| |--------------->output
>>                                                                  |
>>                                                                   \
>>                                                                   /
>>                                                                   \
100k
>>                                                                   /
>>                                                                  |
>>                                                                  |
>>                                                                ----
>>                                                                 --    GND
>> 
>> Why have this? What is it doing for the circuit?
>> 
>> David
>> 
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