This amplifier is from a 1990s Linear Technology component manual. The circuit requires symmetrical power supplies.
According to the consulted American publication of the 1980s, a zener diode can be used for DC...
Published in 1988 in Hands On Electronics, this circuit converts the 12 V of a battery into 120 V AC...
The purpose of this circuit is to measure the resistance of an antenna at the resonant frequency....