2-TRANSISTOR FM TRANSMITTER by 2N3904,2N2222

While there are a plethora of similar 2-transistor schematics available, this one is above average. A major improvement over the little 1-transistor circuit that we’ve discussed previously, this transmitter consist of two stages. The first transistor is used to amplify audio, which means that the microphone is now much more sensitive to sound. The second one acts as an oscillator.

All in all, this is an interesting project for beginners and more experienced hobbyists alike. Use any stiff wire or telescope whip antenna, just make sure that it’s not too long. Range should be about 100m or even more in the open. Stability is still a problem, though.

Part
R1 270
R2, R5, R6 4k7
R3 10k
R4 100k
C1 1n
C2 5.6p
C3, C4 10u
C5 3-18p
L1, L2 5 turns of enamel coated magnet wire with an inside diameter of about 4mm
Mic Electret microphone
Q1, Q2 2N2222, 2N3904 or any other general-purpose NPN

Source: http://www.geocities.com/tomzi.geo/index.htm
Thank you.

FM TRANSMITTER one Transistor by 2N3564, 2N5225
A truly minimalist circuit. Performance is relatively poor and stability is a problem. Q1 modulates the signal and acts as an oscillator. L1 and C5 determine the frequency. Decrease C5 for ...
FM surveillance BuG Transmitter using 2N2222
The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current consumption is 30mA. You can power ...
Simple FM transmitter with a single transistor by 2N2222
Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan's beginning steps. When done right, they provide very clear wireless sound transmission through a ...
House fm transmitter 88-108MHz at 4 Watt
This is Fm transmitter circuit for house. It is modulation type Mono FM and Frequency range 88-108 MHz. By it have Working voltage range 12-18 VDC and use current max at 450mA only. This circu ...
FM TRANSMITTER By 2N2222
There is a lot more to designing an FM transmitter, than meets the eye. Here is a typical FM transmitter circuit. It consists of 3 stages. An audio amplifier, RF Oscillator and RF output. ...