This circuit was found in a Radio Electronics magazine from June 1962. The circuit is for cars of the time with platinum ignition. The indication is made on an analog instrument.
This circuit was found in National documentation from the 1980s. The circuit is intended for...
I got this circuit from a 1977 English magazine. It can still be easily assembled, as the...
The power supply for this 1972 circuit must be symmetrical and the BC549 transistors. Care with...