Wednesday, 21 March 2012

Rangkaian Pemancar TV Sederhana

 Pemancar TV
Skema Rangkaian Pemancar TV Sederhana
This Transmitter Circuit TV uses standard 1 FM modulation for sound and PAL for video modulation. Audio signal will be modulated is pre-amplified using the transistor Q1 and associated components. The transistor Q2 has two jobs: production of carrier frequency and modulation. The pre-amplified audio signal is fed to the base of transistor Q2 for modulation. Capacitor C5 and inductor L1 forms the tank circuit which is responsible for producing the
carrier frequency. The video signal is fed to the emitter of transistor Q2 via POT R7 for modulation. The modulated composite signal (audio+video) is transmitted by the antenna A1.


Inductor L1 can be made by making 4 turns of 24SWG enameled copper wire on a 6mm dia: plastic former. T1 can be a radio frequency transformer with built in capacitor. (Can be found on old transistor radio boards). Antenna A1 can be a 1M long copper wire. (Experiment with the length to get optimum performance). This transmitter is working in VHF band somewhat between 50 – 210MHz. This transmitter is compatible only with PAL B and PAL G systems.

List Componet:
R1 = 10KOhm R2 = 47KOhm R3 = 15KOhm R4 = 8.2KOhm R5 = 47KOhmR6 = 47KOhm R7 = 1Kohm resistor variable R8 = 75Ohm C1 = 10uF/25Volt capacitor electrolik C2 = 0.001uf/10nF capacitor ceramic C3 = 100nF C4 = 10nf C5 = 47pF (variable capacitor) C6 = 10nF C7 = 10pF C8 = 27pF c9 = 100nF C10 = 470uF c11 = 10nF C12 = 220uF/25Volt Q1 = BC547 NPN transistor Q2 = BC547 NPN transistor
T1 = T1 can be a radio frequency transformer with built in capacitor. (Can be found on old transistor radio boards).
L1 = 4 turns of 24SWG enameled copper wire on a 6mm dia: plastic former.
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