We found this version of the automotive tachometer in a 1980s publication. Variations from other sources appear elsewhere in this section. The indicator is a 0 to 1 mA milliammeter.
RF voltmeters can be tested with this circuit that generates a test signal. We found it in old...
This oscillator with the CA3130 was obtained from an English publication from 1977. The circuit does...
Found in Philips documentation from the 1970s, this circuit uses components from the era. The...