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Warnings:
Before we go any further, I want to warn you about a couple things you may buy this electronics. Electrostatic loudspeakers use high voltages to operate. They need a DC bias of up to 5000 V and use AC voltages up to 5000 V. The DC bias is usually supplied by a power supply running off 120VAC electrical circuits which can be dangerous. The AC voltages used to drive the ESL are usually produced by connecting your stereo amp to a vacuum tube amplifier type output transformer. The voltages produced by the transformer are dangerous! Don't screw around! If you have little kids in the house or if anyone might for any reason touch the speakers while they are operating, design your speakers so that it is not possible to come into contact with the drivers. If you don't know how to handle high voltage circuits, enlist the help of someone who does, or buy one of the commercially available ESLs.
Section I: Making the speakers
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!
What you need:
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 buying electronics and 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...
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