It's been long time I haven't done any radio communication circuits. I spent lots of time in building AM transmitter and FM transmitter circuit . When I was engineering student, we didn't had enough time to do the practical implementati…
My fascination with the invisible waves carrying sound through the air has always been profound. The idea of broadcasting my own audio, even a short distance, felt like a magical feat of engineering. This curiosity led me down a path of exploration…
Since my soldering iron got damaged I could not de-solder components from the Compact Fluorescent Lamp (CFL) bulb circuit board today. I have to buy a new one, but until then I learned more about the CLF bulb circuit components. As part of learn…
Here the working of an FM transmitter circuit that uses a two-stage amplifier and an LC tank circuit to generate and modulate a carrier wave is explained in details. The audio signal from the microphone modulates the frequency of the carrier wa…
In direct FM transmitter circuit , a bypass capacitor(C2) is often used on the base of the oscillator as shown in the FM circuit diagram below. The C2 10 nF bypass capacitor between the base and ground in your FM transmitter circuit serves an imp…
In direct FM the carrier signal frequency is varied in accordance to the message amplitude. Consider the following single BJT transistor FM transmitter circuit shown below. The BJT 2N3904 is an oscillator and frequency modulator. The transistor tog…
Shown below is circuit diagram of a simple one BJT transistor based FM transmitter circuit . Frequency modulation (FM) in the transistor FM modulator circuit occurs due to the variation in the capacitance of the transistor (specifically, the base-…
