This crystal tester was found on a 90s Ham Radio. Transistors are commonly used. The circuit is for testing crystals from 2 to 20 MHz.
This circuit was found in an Electronic Design. It makes use of a relaxation oscillator to trigger...
This circuit controls a heating element using a triac. Triac must be fitted with a heat sink. We...
This circuit consists of a bass filter that can be used as a subwoofer in a sound system. The...