Ringmod transformers

[Ken Stone]

About 20 years ago I made a pair of such ring mods, literally just grabbing
a few unknown transformers I had lying about from old transistor radios. The
ring mods worked fine. Of note, if the transformers are mismatched, you will
get different harmonic distribution depending which of the two inputs you
use as the modulating signal.  I'd pick transformers with at least 1k
impedance for their coils. In other words, don't use 8ohm speaker transformers.

Ken.

>	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?
>
>	Jason
>
>
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                Ken Stone  sasami at blaze.net.au
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