9V fm transmitter circuit design using transistors

  
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The tuned coil L1, has two output tapping for the antenna connection, marked `A` and `B`. These are both low-level outputs and you choose which tapping you want to use ( stable low range, or more unstable but higher range). Tap B (2. 5%) takes just a very small portion of signal from the oscillator circuit and therefore gives a very frequency stabl
9V fm transmitter circuit design using transistors - schematic

e transmitter. The output level (around 2. 5mW) and range are therefore somewhat reduced. The frequency determining elements (L1, C5 and C6) form a simple LC tuned oscillator. The inherent problem with this type of circuit diagram transmitter is that any external load (antenna) will change the operating frequency.



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