This 1975 circuit for automotive applications replaces the mechanical vibrator found in old cars to produce high voltage in the supply of tube equipment.
This amplifier, found in a 1980s documentation, should be powered by a symmetrical source. Modern...
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...
Up to some minutes intervals can be obtained from this circuit. The circuit can use a lamp (or...