This General Electric circuit is from the 80's. The PUTs used in this meter are not common components today.
Found in Popular Electronics from the 90s, this signal tracer or tracer can be used with the inner...
Panasonic AN44183A Microstepping Motor Driver is a two channel H-bridge driver with a bipolar...
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....