Voltage to frequency converter (CB9449E)

This circuit was obtained from a 90s Radio Electronics. The components used are from that time. The FET admits equivalent.

| Clique na imagem para ampliar |

Stereo FM Transmitter (CB16996E)
This circuit is from 1995 documentation, with Q1 and Q2 of type 2N2218 or higher power. L1 has 3 + 3...
Two-tone oscillator (CB9071E)
This circuit was found in a 1965 Radio Shack documentation. The transistors are from that time....
Half-Wave Rectifier LM741 (CB25218E)
This instrumentation circuit was found in the September 1989 issue of Radio Electronics magazine....