This 1965 circuit uses a Philips 4068 tube to measure extremely small charges. The circuit has as indicator a micro ammeter and the transistors are of the time.
This circuit decodes signals received in SSB (Single Side Band) obtaining an audio signal for...
Using two PUTs this circuit generates signals as shown in the figure. The circuit is from a Radio...
Found in a 1960 Mullard transistor manual, this circuit uses components from the time....