20 MHz Oscillator (CB17506E)

This crystal oscillator generates a 20 MHz signal. Equivalent transistors such as BF494 and 2N2222 can be used. The stabilizing diodes can be 1N4148.

| Clique na imagem para ampliar |

Voltage to Frequency Converter LM331 (CB14339E)
The circuit shown is from National Semiconductor, having been found in the 1994 Linear Application...
Digitally controlled amplifier and attenuator (CB9030E)
We found this circuit in a 70s American documentation. The integrated circuits are from that time....
Triangular Signal Generator (CB10770E)
This circuit is from a 1978 French magazine Electronique Pratique. The magazine no longer exists, but...