This circuit is from a 1968 documentation using one of the first integrated circuits available at the time, the TAA370. The circuit is powered by 1.3 V using a 200 ohm handset.
The circuit is from the Linear applications Handbook of the National Semiconductor of 1994. The...
This circuit was found in Motorola documentation from 1966. The lamps are according to power and...
This filter eliminates the rumble of the motor of a record player when recovering this type of...