This circuit was found in a documentation of the 80s, having didactic purpose. For R1 values between 10k to 1M can be used. Transistors are general purpose types.
This circuit was originally indicated as a signal reinforcement step for the previous receiver...
This complex circuit was found in the 1993 edition of the Electronics Experimenter's Handbook. Most of...
This simple component tester was found in the October 1997 issue of Electronics Now magazine. The...