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 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...
Connected between an external antenna and the antenna input of a receiver, this circuit provides...
The purpose of this circuit from a 1995 publication. Its purpose is to alert a person when he...