10nF, use film caps.
I would have also connected the feedback resistor after the totem pole inst=
ead of before it to correct for some of the distortion in the final stage.

Cheers,
Robert

----------------------------------------
> From: bobblick@ftml.net
> To: piclist@mit.edu
> Subject: Re: [EE] simple opamp amplifier problems
> Date: Tue, 17 Mar 2015 22:01:18 -0700
>
> Actually I take back that thing about the third diode, just the pulldown
> resistor should fix things.
>
> Bob
>
> On Tue, Mar 17, 2015, at 09:46 PM, Bob Blick wrote:
>> Hi Ryan,
>>
>> The LM358 will require a pulldown resistor on its output, otherwise it
>> runs class B and will distort real bad.
>>
>> Also you will need to get the bases of your transistors a little further
>> than 2 diodes apart. Put a third diode in there, and it should sound
>> great but use too much current. Make that third diode a Schottky and you
>> should be golden.
>>
>> Cheerful regards, Bob
>>
>> On Tue, Mar 17, 2015, at 09:36 PM, Ryan O'Connor wrote:
>>> Hi guys, I've bread-boarded the following circuit, but its not playing
>>> audio. I get only DC current at the base of the 2N4401. I've had it
>>> playing audio briefly while screwing around. For example if I remove
>>> the 0.01uF cap from the non-inverting input of the left-most opamp and
>>> plug it back in, I hear a distorted version of the song I am playing
>>> as input for about half a second (actually the cap value is polar
>>> 47uF). Then silence, DC voltage. Could it be because I am using
>>> electrolytics for these two caps? I can't find any "103" bipolar lying
>>> around, or even close to it. I tried a 0.47uF bipolar but I only hear
>>> about 0.05 seconds of audio when I plug/unplug that one. Have double
>>> checked all the wiring twice.
>>>
>>> Circuit below:
>>>
>>> http://www.techlib.com/electronics/graphics/audioa14.gif
>>>
>>> Cheers,
>>> Ryan
>
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