This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer available that timer and the transistors are germanium types. The circuit is intended to receive MW stations.
In this circuit found in a 1991 publication we can use the 2N2646 unijunction transistor and the...
This circuit transforms your low sensitivity analog multimeter into an electronic voltmeter with...
This 10-step voltage indicator was obtained from a 1980s publication. The circuit is based on an...