Found in documentation from the 1990s, this circuit converts 12 V to 9 V from a car's power output. The 100mA current eliminates the need for a heatsink on the transistor.
I found this circuit in an old English magazine from 1979, but it can be easily assembled with...
This positive pulse extender or stretcher was found in a Popular Electronics from the 90s. The...
This circuit was found in Motorola documentation from 1968. SCRs can be modern equivalents and the...