This circuit is used in VHF and UHF superheterodyne receivers. The circuit is from the 1964 RCA transistors manual. Equivalent transistors such as the BF495 can be used.
This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from...
This flasher was originally intended for Christmas tree lamps. The circuit is from 1974 and uses...
The components used in this configuration are not common today. The circuit is from the 1982 SGS...