AW: Ringmod transformers

[Haible Juergen]

	>	I am about to attempt the ringmod circuit that Kevin
Lightner has 
	>posted on his site.. (Starting with the tough ones..=)) Anyway,
it 
	>requires 2 driver transformers, and the part listed (Stancor
A-4713) 
	>apparently does not exist anymore.(?) The schematic states that
"many 
	>small driver transformers will work", but neglects to mention
anything 
	>about specs, etc. For those of you who have built this/know
what I mean, 
	>does "many" mean "any" small driver transformer, or is there a
certain 
	>type (EI-19/24?) or spec concerning resistance/impedance/mW
output which 
	>I need to match?

Honestly, if you don't have the transformers unused in some drawer
already, I would not build this ringmod at all.
If you want a cheap ringmod, build one from one single ota:

http://www.national.com/ds/LM/LM13700.pdf

Page 9, figure 6

JH.