P86 Audio Oscillator

[Bengali]

Hi,

I built the P86 circuit:

http://sound.westhost.com/project86.htm

I would like to extend the range from 20hz to 20KHz.

with the suggested values changes for C8 and C9 to 0.15uF
and R8,R9 to 2K, I get the following:

Low Range 20Hz - 531Hz

Hi Range 785- 20415Hz

I need help on how to get the low frequencies to overlap.
Since I'm missing frequencies between 513Hz and 785Hz.

Thanks.

 

[redrabbit]

You may have to alter the 2.2k resistors going to the dual 50k pot.
I left the caps as in the schematic, but put 2k trim pots in place of the 2.2k resistors.

See my post...
http://sound.westhost.com/phpBB2/viewtopic.php?t=1801

=RR=

 

[Bengali]

thanks RR,

I got it working and testing with a small amp and speaker.
I don't have a scope yet to see how it looks.

neat little circuit. Thanks to Rod! 🙂