This two-transistor circuit was found in a 1966 US documentation. The power transistors are of the time. The system is intended for cars with contact breaker.
This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and...
This very high input impedance preamplifier is from a publication of 1977 but can also be mounted...
This circuit allows the use of a common cassette to pass the tape recordings to other media with...