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16:56 Простая радиостанция вещания
Why it is important to use a limiter? Audio signals as music or speech have big dynamic ranges. There are silent and loud sections. These audio signals aren't too good for a transmitter, which requires audio signal with constant level on the input. Limiter is a device, which weakens loud signals and intensifies silent signals. On its output there is signal with constant level. Technical specifications Supply voltage: 10-14 V stab. Supply currents: 20 mA Audio input: impedance 20 kOhm, optional preemphasis Output voltage: 0,4 V rms Dynamic range: >50 dB Output voltage vs. input voltage Schematic diagram Parts list Resistors: R1 - 68 k R2 - 22 k R3 - 180 k R4 - 10 M R5 - 10 k R6 - 47 R R7 - 240 k R8 - 1,5 k R9 - 820 R Capacitors: C1 - 100 p (ceramic) C2 - 1 n (plastic) C3, C6, C12 - 100 n (ceramic) C4, C11, C13 - 100 u (electrolytic) C5 - 0,33 u (tantalum) C7, C8 - 10 u (electrolytic) C9 - 220 n (plastic) C10 - 47 n (ceramic) C14 - 470 n (plastic) Misc.: T1 - BF245C T2 - BC556B, BC307 IC1 - LM386 PCB layout
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