This electrochemical circuit monitors the conductivity of the oil indicating when to change it. The circuit is from an 1967 American documentation.
This Tesla coil was found in the November 1994 issue of Electronics Now magazine. T1 is a TV...
Found in a Popular Electronics from the 90s, this circuit presents the difficulty of obtaining the...
In this project, from a Japanese magazine of 1973, only one channel of a stereo amplifier of 20 W...