This filter is from the Linear Applications Handbook of the National Semiconductor of 1994. However, it can be used with other operational and modified to operate with other frequencies.
Found in a 73 magazine for radio amateurs of the 1980s, this circuit uses a dual-gate MOSFET. This...
This shunt voltage regulator was found in an Electronic Design from the 90's. The power transistor must...
This commercial amplifier uses germanium transistors from the era. It was found in a Japanese...