Code Sidetone Generator (CB26323E)

This code practice circuit was found in a 1990s issue of Radio Amaterur Today magazine. It produces an audio tone with the 555.

| Clique na imagem para ampliar |

Wien Bridge Oscillator (CB14117E)
The configuration presented below was obtained in the Linear Application Handbook of the National...
Motor Control (CB24778E)
This circuit was found in December 1983 Radio Electronics magazine. The maximum output current is 1 A...
Field strength meter (CB7356E)
This untuned circuit uses one of the world's first commercial transistors, the CK722, having been...