CLICK HERE if this site has been useful to you Useful Circuit Ideas Browse through the unsorted titles below to see if what you need is there. Click on the title to see the full-size schematic. Save the image to disk, then use your favorite graphics program to scale it to your needs and print it out. The files can be pretty big, but the print-out quality is worth the wait. You can contribute curcuits by emailing me a CLEAR black and white GIF image of the schematic, and brief description of operation. If its not clear, out it goes.  Since some of these are from other sources, I DO NOT assume any responsibility for their use or for results thereof. If you like to create your own circuit schematics, I highly recommend  455khz crystal Oscillator - useful testing tool Simple Microphone and Coax Tester Variable Power Kit - works with most radios  Polarity Checker   Simple VOX circuit  Power Isolation Circuit  Automatic Message Transmitter - Updated version, accurate and tested Roger Beep Schematic  Another Roger beep, Simpler design D-104 Desk Mic Amplifier Schematic D-104 JFET-based hand-held mic Schematic JFET Crystal Oscillator Old-Fashioned Siren Toy - you can safely play with part values for unique sounds Laser-Sound toy Square-wave tone generator Receive Amplifier Circuit Simple Antenna Matcher Here are a couple pics of the one I threw together
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