Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

Tape Recorder Circuit (CB18339E)
This is the typical circuit of a 60's tape recorder. The circuit uses only two transistors and has a...
PIC16LF153 Microcontroller
April 2017 - Microchip's new PICLF153 microcontrollers that already incorporate analog and...
Transistor Radio TR3B (CB18388E)
This commercial radio with 3 earphone listening transistors was manufactured in Japan in the...