Photodiode amplifier (CB20691E)

This high-gain circuit was found in American documentation from the 1990s. The operational amplifier supports a modern equivalent.

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Voltage Controlled Oscillator RC4558 (CB19784E)
This VCO makes use of an RC4558 which is an operational amplifier with characteristics close to...
Symmetrical power supply (CB21691E)
In the figure we have a symmetrical power supply stabilized by a zener diode. Transformer and...
Colpitts Crystal Oscillator (CB19355E)
The crystal used in this oscillator can have frequencies up to 30 MHz or more, depending on the...