This 80's circuit uses a germanium transistor like the AC121. The circuit has an output transformer of the type found on many transistor radios of the time.
Originally suggested by Electronic Design in a 1965 documentation for use with oscilloscopes, this probe has...
This circuit uses currently uncommon components, including the 10.7 MHz (FI) filter. This circuit was...
This optical tachometer with LASCR was found in a 1965 General Electric documentation. The diode at...