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 |

Mixer with unit gain (CB8758E)
This circuit was found in a 90s Radio Electronics. The integrated circuit admits an equivalent. The...
Intelligent battery charger (CB7130E)
Suggested by Radio Electronics from the 90s, this circuit is suitable for NiCAd batteries with a...
Key Touch Switch (CB16269E)
To control direct current loads, under voltages between 12 and 200 V, and currents up to 3 A, we...