This simple timer for incandescent lamps or other non-electronic charges uses a triac as a control element. The triac must be mounted on a heatsink and the time obtained depends on capacitor C2.
This circuit is from a 1997 publication. In it, the circuit uses a light emitter that points to a...
The integrated circuit of this amplifier is not very common today. The output transistors can be...
This circuit for measuring bridges was found in American documentation from the 60's. Transistors are...