42 kHz oscillator (CB21805E)

This circuit was used as an eraser for old tape recorders. The circuit is from a 1960 Mullard transistor manual.

10 W amplifier TDA2003 (CB17619E)
The 10 W power is obtained with a load of 2 ohms. The integrated circuit must be mounted on a good...
Binary Demonstrator (CB24244E)
This TTL circuit was found in the February 1973 issue of Radio Electronics magazine. The power...
Crystal Tester (CB24174E)
This circuit was originally designed for testing crystals used in color televisions, but it works...