Electrostatic Loudspeakers project

Building ESLs involves the use of tools and materials that if handled improperly can be hazardous. Please make sure you know how to use these things before you begin. By all means, use safety glasses at all times. If would be foolish to trade your vision for the pursuit of audio ecstasy!
Electrostatic Loudspeakers project - schematic

1) Transformers, one or two per speaker - use tube amp output transformers, 4 ohm:8K -20K ohm. I have used Tango CRD-8 ( 4:8KCT) transformers that I bought in Japan. You can use transformers by Triad, Stancor, etc. Just get units that are good for about 15-20 W at 30 Hz and give a large impedance (i.e. voltage) transformation. Expect to pay about $50 each for transformers. Tube amp output transformers are available from Antique Electronic Supply, 602-820-5411, and other sources. 2) Plastic film for speaker diaphragms- Mylar or other polyester, thin (5-6 microns), and large enough to make the size of driver you want to build. This can be obtained from companies that make plastics for industry- this film is commonly used to make capacitors (don't get metalized film!). I bought a roll that is 1200 m long by 1 m wide for about $85 in Japan a few years ago. I have used about 15 m of it so far. I have heard of people using Saran-wrap, but I have never heard a driver built using it. If you're making small drivers, or experimenting, try it! It certainly won't cost much... 3) Powdered graphite, dish soap, or antistatic solution to coat diaphragm. Powdered graphite is available from K-mart or your local hardware store for lubricating locks. It will cost no more than $2 for enough to make about 50 speakers. Graphite has to be rubbed into the film using cotton balls. Dish detergent and antistatic solution will work also, and are...

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