2 transistor fm transmitter


Posted on Feb 6, 2014

I accept acclimated a brace of BC548 transistors in this circuit. Although not carefully RF transistors, they still accord acceptable results. I accept acclimated an ECM Mic admit from Maplin Electronics, adjustment cipher FS43W. It is a two terminal ECM, but accustomed activating mic inserts can additionally be used, artlessly omit the advanced 1


2 transistor fm transmitter
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0k resistor. The braid L1 was afresh from Maplin, allotment no. UF68Y and consists of 7 turns on a division inch artificial above with a affability slug. The affability bang is adapted to tune the transmitter. Actual ambit on my ancestor acquainted from 70MHz to about 120MHz. The aeriform is a few inches of wire. Lengths of wire greater than 2 anxiety may clammy oscillations and not acquiesce the ambit to work. Although RF circuits are best complete on a PCB, you can get abroad with veroboard, accumulate all leads short, and breach advance at adapted points. One final point, don`t authority the ambit in your duke and try to speak. Body capacitance is agnate to a 200pF capacitor shunted to earth, damping all oscillations. I accept had some aboriginal duke acquaintance of this problem. The abundance of cadence can be begin from the approach section, and an archetype now appears in the Ambit Analysis section.




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