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To the fellow I was just talking to on skip (6-17-2010 5:08PM EST) , I'll post that three-beep deal you liked as
soon as I can.
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
- Random Redneck ID Toy - Generates three fast, random beeps on key-up, and three more when unkeyed. Note: this chip requires special programming, the text of which I have posted here. If you are familiar with the PICAXE microcontrollers, and have some programming experience, then you will be able to come up with your own sounds and actions using this circuit. You can download the actual PICAXE code file here
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