[sdiy] VCAs from outer space

[xamboldt]

Ray himself wrote this last November:
________________
Hi All

Just getting back to those who wrote as to whether this VCA circuit  
was OK on +/-15V.
Its good to go. Tested it this morning and it worked with no  
modifications.

http://www.musicfromouterspace.com/analogsynth/DLLVCA001/DLLVCA001.html

Cheers All

Ray
______________

-Chris


On Jan 24, 2006, at 12:32 AM, harrybissell wrote:

> Off the top...
>
> Make R14, R34 = 150K
>
> R5, R12, R27, R36 = 125K (124K 1%)
>
> R8, R30 = 25K  (24.9K 1%)
>
> That should do it. In general these need to be changed because they
> set voltages or currents. The values around the opamps are usualy ok
> because they work by ratio, not absolute values.
>
> The resistors arounf the LM13700 are probably OK.
>
> You really might not ~need~ to change anything, but this will make the
> circuit work exactly like it would on +/-12V
>
> H^) harry
>
> dustin sedlacek wrote:
>>
>> I have been looking at Ray Wilson's dual log/lin VCA,  I use a blacet
>> power supply. On the music from outerspace site it states "If you are
>> using +/-15 volt supplies you will probably need to mess with some
>> values to get this to work for you." what values would need to be
>> changed ? can someone offer some help ? Thanks in advance
>> -Dustin