How to pick a transformer for a ring modulator?

[soggybag]

I want experiment with a transformer based ring mod. How do you pick a transformer? I figure I will run it off 9v.

Looks like the Ring Stinger uses a 20K:1K. Does anyone know what's used in the Ringtone?

[DougH]

http://www.asciipr0n.com/4096/ringmod/index.html

This shows the "simple ring modulator" circuit and quotes a Mouser part number for the transformer. Maybe try looking up the specs on that transformer?

[cloudscapes]

I've used both the 42TL016 and 42TL218 with success

[soggybag]

Thanks for the reply. Looks like these are all the usual suspects. I think I even have a few of these in the parts bin.

What's the difference between using a 10K:10K vs a 20K:1K? The Ring Stinger seems to break the rule of using a transformer with equal coils. Does this help get over the diode drop. Or does it make a difference with your input buffer?