We found this version of the automotive tachometer in a 1980s publication. Variations from other sources appear elsewhere in this section. The indicator is a 0 to 1 mA milliammeter.
We find this circuit in an American 1980s documentation. It triggers an alarm in the event of a...
This circuit allows the testing of integrated circuits of type 741 (operational amplifier) such as...
This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a...