This circuit was found in 1960s Radio Electronics. The circuit uses components from that time. The triac is according to the controlled load. The sensor is a common LDR.
We found this circuit in a 1973 publication. The circuit lets frequencies below 480 kHz pass...
This power supply was originally indicated for work with electroplating. The transformer is 2 A or...
This simple circuit serves to identify the terminals of a PNP transistor. For NPN transistors, just invert...