We found this bridge circuit in Electronics Now magazine from September 1995. The instrument can be from 50 uA to 1 mA. The trimpot value depends on this instrument.
This blocking oscillator circuit was found in a book by Rufus Turner from 1954. The circuit uses...
This diode tester was found in an English publication from the 1980s. Transistors are...
This circuit was obtained from Hands-On Electronics, an American magazine of January 1987. The...