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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2 transistor radio (CB22272E)
We found this circuit in an American documentation from the 60's. The transistors are made of...
Digital Capacimeter (CB4312E)
The accuracy of this circuit depends on adjustments made with capacitors of small tolerances of known...
OR function with Relay (CB19773E)
The figure shows how to implement an OR function with two inputs, using a relay. The relay...