Tuesday, November 24, 2009

MW Receiver_superheterodyne_4 Transistor_Regency Old Radio

A very simple four transistor radio.

First stage is made up of one transistor that multiply the local oscillator frequency signal by the recieved frequency signal.

Second and Third stages is amplification and filtering of IF 455 kHz

Fourth Stage is detection by diod and audio amplification by one transistor. Transformer is used to couple 15 ohm speaker.

Thats it!

I think it worth rebuilding it even with different transistors. Anyway the first three transistors should handle frequencies of more than 1 MHz.