Phone Call Amplifier (CB21271E)

This circuit was found in an old Electronics Now. The transistors are general- purpose and the circuit is powered by an external source.

| Clique na imagem para ampliar |

Single-Channel Radio Control Transmitter (CB3817E)
This single-channel remote control transmitter operating in the FM range uses common components and...
Pulse width discriminator (CB9690E)
This circuit was obtained in a 70s American documentation. The integrated circuits of the time are...
Limiter for Nicad discharge (CB8382E)
This voltage sensor limits the discharge of a Nicad battery. We found it in an American...