This circuit is from 1975 documentation. Transistors such as 2N3055 can be used and the transformer is of a special type. R1 is 200 ohms and R2 is 10 ohms.
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...