[sdiy] TomG's 9v diode ladder VCF

[Plutonique9]

Hey there people,
I'm going to build the 9v diode ladder from the Cookbook as my 
introduction in VCF construction. I have a couple of Q's regarding it 
though.

Diode matching:: I'll be using 1n4148's for the diode ladder, I'm 
pretty sure these need to be well matched. On my multimeter, it has 
some sought of diode testing inbuilt, this is a radioshack digital 
multimeter BTW. Is this suffiecient to match diodes, or should i 
build a dedicated "diode matching" circuit, which runs a 9volt 
battery through the diode via a resistor, no difference?

Also, using a LM394 should yield better results than two 2n3904's, 
right, $4.00 here, hope its worth it.

Also, I'm not sure where that "BIAS" circuit is supposed to link up 
to? At the input, it has a symbol, there are 4 other positions on the 
schematic which also has these symbols, does the "BIAS" go to all of 
these?
For example, what does the 100k resistor going into the non-inverting 
input of the TL071 connect to?

Hmmm, I think that covers all the shady areas, thank you for any 
insight.


-- Plutonique9, Plutonique9 at symbiocom.com

http://www.mp3.com/Plutonique9