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My home-brew touch keyer uses several kits:
The CWTouchKeyer P3W circuit card
The N0XAS PicoKeyer
The Jackson Harbor sine wave - shaped CPO kit
CanaKit 10 watt audio amplifier
5V Digikey Reed Relays # 306-1020-ND, with internal diode.
The paddle is made from cap of a marking pen
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