P86 Audio Oscillator

Bengali · 11th November 2007, 07:13 AM

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 · 7th January 2008, 07:47 PM

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 · 7th January 2008, 08:10 PM

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!

11th November 2007, 07:13 AM	#1
Bengali diyAudio Member Join Date: Oct 2006	P86 Audio Oscillator 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.

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7th January 2008, 07:47 PM	#2
redrabbit diyAudio Member Join Date: Oct 2004	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=

7th January 2008, 08:10 PM	#3
Bengali diyAudio Member Join Date: Oct 2006	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!

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