Siren Oscillator (CB8449E)

This circuit was found in a 90s European documentation. The circuit already includes a powerful amplification stage. The MOSFET can be of any type.

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Fluorescent SCR Inverter (CB12328E)
This circuit is from a 1967 publication. It is possible to power a fluorescent lamp from a 12 V...
Modified Hartley Oscillator (CB21138E)
This circuit was found in old American documentation. Transistor is general purpose and coil rated...
Schmitt Trigger LM3900 (CB5049E)
With a strong positive feedback (via a 10 M resistor) we can get the trigger setting for the...