With an 18 V input, this regulator was found in Philips documentation from the 60's. The transistors are from that time. The power transistor must have a heatsink.
This circuit was obtained in a Motorola manual, but it applies to almost any operational...
Found in a 1990s Motorola documentation, this circuit aims to protect a triac that drives an...
Found in a 1968 documentation, this small amplifier was very popular at the time being used in...