Based on the Philips TDA3810N, this circuit was found in an 90s Electronics Now. The circuit has two channels including the voltage regulator stage.
This simple metronome, from 1985 documentation uses only transistors and has two settings. For...
We found this circuit in a 1988 documentation. The circuit uses a conventional complementary...
This circuit was found in a 1990 publication. The sensors are electrodes placed in the water tank...