Schmitt Trigger 7400 (CB22419E)

This low hysteresis circuit was obtained from old documentation. The circuit must be powered by a voltage of 5 V.

1-Transistor Amplifier Stage II (CB19570E)
Unlike the previous one, this circuit uses only one resistor in the base polarization. The...
Mechanical reverb (CB22208E)
We found this circuit in an English documentation from the 80's. Transistors can be modern...
Temperature Relay (CB24076E)
Found in the August 1970 Radio Electronics magazine, this circuit uses a CA3018 with the trigger...