Found in Texas Instruments documentation from the 90's, this circuit can be used as a shield due its symmetrical power is 5 V. The circuit has offset adjustment and a pass band of 200 kHz.
This lead-acid battery charger was found in a Popular Electronics from the 90s. The circuit has a...
This three-chanel remote control transmitter uses a unijunction transistor as low frequency...
This circuit was found in the 1990 Motorola Linear Databook and can use almost any operational...