This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974. Transistors are common types at the time.
This circuit can be used as shield or to drive powerful loads from low current switches such as...
This low power bass booster is from the 1977 National Semiconductor Audio Handbook. The circuit is...
This three-chanel remote control transmitter uses a unijunction transistor as low frequency...