FM transmit circuit made with TA7335 integrated block ---- TA7335 FM Transmitter

FM transmit circuit made with TA7335 integrated block, TA7335 FM Transmitter Keywords: FM transmit circuit made with TA7335 integrated blocks Using the TA7335 to make a frequency modulated frequency circuit, the circuit is simple and practical, the emission frequency is stable, low power consumption, suitable for amateur production. The TA7335 pin function is as follows: 1. Soot antenna signal input; 2 foot power supply; 3 foot high placed output tuning loop; 4 foot mixer input; 5 foot; 6 foot mixed output; 7 inside oscillation External LC loop; 8, there is a variable diode interior. When the left and right audio signals are mixed by R4, R5, the signal size is adjusted by the W and R5, which is sent to 8 foots through C7, L3, so that the inner velocity diode capacity varies with the audio signal, thereby changing the 7 foot The frequency of the external resonant circuit realizes the frequency modulation of the oscillator carrier. The outer outer member provides a stable voltage for the internal variable diode. LED also serves as a power indication. The tuning oscillator signal is input to the mixer. 1881. Here be an amplifier, output from the foot, emitted through the antenna. When the actual production, the L1, 12 is used, and 0.5mm the painted wire is taken away from the ballpoint pen, and L2 is tap in the middle. Lj is a small inductor, or it can be replaced with a LOK resistance. The antenna is cooked, the tie rod antenna can be used. After the circuit is powered, the fine tuning C1 can change the transmit frequency and adjust C3. The launch signal is the strongest, the distance is the farthest, in order to reduce the external interference, the input signal line should be shielded.

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