Next part would be to add an RF amp and LO so that to achieve a stand alone working FM receiver and I feel pretty confident that that would be so simple actually!īelow is the current status on breadboard, and you can see the signal generator outputting 102.9MHz used for ~455KHz down-converting for the receiver. No tuned input circuits employed as of now and the whole circuit is powered using 3V(2xAA cells) I need hit radio shack, if they even have something that small and precise, any diy ideals Maybe a transistor radio laying around Reply. Being connected with just a 5" antenna at the emitter of the transistor and Signal Generator output injected to the base in place of LO, let me say I'm quite surprised that the system could clearly receive couple of strong local FM stations nearby.įor 102.3MHz, I've injected around 102.9MHz to tune in the station clearly. So I've added a simple charge pump FM demodulator consisting of 2 BC547's and a BF494 wired before the IF stages as a simplest mixer. The next stage was to remove the oscillator/mixer and detector part from the working receiver to actually convert it to an FM receiver. FM Section The FM IC used on this little radio is a CD9088CB. : Elenco AM/FM Radio Kit Switch Between ICs & Transistors Solder Great STEM Project Superheterodyne Designed to AM and FM Broadcasts. Infineon’s reliable high-volume RF transistors offer exceptionally low noise figure (NF), high gain and high linearity at low power consumption levels for RF applications. All this from a transistor radio powered by 3 volts of batteries. This one was a big success and I could receive the local AM stations clearly and apparently I got surprised a bit on how beautiful is the so called 'superheterodyne' principle! Infineon Technologies provides high-performance radio frequency (RF) transistors targeting FM radio applications. Download scientific diagram prototype transistor FM receiver (1957) from publication: THE INTRODUCTION OF FREQUENCY MODULATION FOR SOUND BROADCASTING IN. A transistorized FM superhet receiver which can demodulate and output broadcast band FM stations.īut the interesting thing is that I have started with a basic Medium Wave receiver circuit with 455KHz two stage IF and basic germanium diode AM detector. I've carried out some quick experiments after the arrival of my new RF Signal generator/counter. The two transistors in this circuit are very likely intended to be a regenerative detector. The front end of an RF communication receiver or transmitter combines a number of subsystems in cascade.
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