This circuit was found in a 1965 Electronic Design. Transistor Q2 must be load dependent. The circuit can be adjusted for currents from 1 to 10 A. The voltage drop is 3 V and the maximum voltage is 35 V.
A frequency divider for digital signals can be constructed based on a single 4018 integrated...
This switched power supply was found in a 70s documentation. The basic components are from that...
This circuit was found in an English magazine from 1977. The critical component is the gas sensor....