The sensors in this circuit that triggers when the temperature goes out of a certain range are common diodes. The circuit is from the 1991 Reista Electronics Experimenter's Handbook.
This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency...
With this circuit you can produce the sound effect passing from one channel to another. The...
This amplifier makes use of a simple 12 to 30 W source, having been found in the SGS manual of...