VCO without varicap (CB9435E)

This circuit was found in a 90s RF Design. It is an oscillator that can reach 800 MHz, with the frequency controlled by an input voltage.

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20 V adjustable power supply (CB8167E)
Found in a 90s Silicon Chip documentation, this circuit provides a current of 3 A and the voltages...
15W Amplifier (CB18434E)
We found this circuit in a Japanese publication in 1967. The circuit consists of a 15 W audio...
Resistance Bridge (CB3911E)
This is a bridge for the measurement of low value resistances and high values too. The circuit...