Ringmod transformers

[Solenoid]

On Thu, 21 Aug 1997, [22Hz] Productions wrote:

> 	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?

I got stuck at this point also, though I didn't determine that the Stancor
A-4713 transformer (I'm lost as to how to derive the specs or where to
look for them for this) was no longer made, I just gave up trying to find
them.

I built a PAIA-kit ring mod and tried to understand the two-diode thing
that seems to be what produces the product/sum frequencies after plugging
my sh101 into it and getting some great sounds: I want to just build a
switchable (routable later) ring-mod into the sh101 and other synths.
Kevin's circuit is the most elegant to start with I guess...

Let me know the answer to this as well, 'k?

                                             solenoid at europa.com <------+