We found this circuit in a 1980s documentation. Equivalent components can be used. The circuit senses temperatures in the range of 0 to 50º C and uses a transistor as sensor.
This sound effect circuit was found in a 1987 publication. It is a circuit that drives a set of...
The adjustment of the maximum load voltage is made in the trimpot. The circuit is from 1994...
This lock-up alarm circuit was found in a 1990s Radio Electronics magazine. The sensors are...