Other amplifiers of the series like the MC3301, MC3401 and LM2900 can be used in this circuit. We found this setting on Motorola's Linear Interface ICs. The circuit uses a magnetic sensor.
Found in Mallory documentation from 1968 this circuit uses an integrated circuit from that time. The...
This didactic circuit was found in an English publication of 1965. The sensor is an LDR and...
Found in Datel's documentation from the 1980s, this circuit makes use of the company's operational...