Stereo transmitter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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The transmitter operates in the VHF band. Depending on the capacitance of the capacitor C12 (2 ... 45 pF), its frequency can vary from 70 to 130 MHz. A specialized BA1404 chip is used as a stereo encoder.
Schematic diagram of the transmitter (click to enlarge)
Details:
Coil L1 contains 5 turns of wire with a diameter of 0.8 mm. It is wound on a mandrel with a diameter of 5 mm and a length of 5 mm.
Coil L2 contains 5 turns of wire with a diameter of 0.5 mm. It is wound on a mandrel with a diameter of 5 mm and a length of 10 mm.
Light bulbs LP1 and LP2 - 12V / 40mA.
Board appearance
PCB drawing
Location of elements on the board
Author: Thomas B. Collins; Publication: N. Bolshakov, rf.atnn.ru
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