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VU Meter 2

2017-12-22 11:16  
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VU Meter 2

VU_Meter_2.gif (28613 bytes)

  ??? ??????? ???????? ??????? ????????? ???? ?? ??? ?????? ???????? ??? National. ?? ??????? ???? ??? ?? IC1 ????? ?????????? ??????? ??? ????????? ?? ?? ??????? Tr1. ?? ??????? ???? ??? ?? IC2 ????? ??????????? ????????? ??? ?????????? ??????? . ?? ??? ???????? S1, ?????????? ?? ????? ??? ???????? ??? ?? ?????? ??? ?? LED. ?? ??? ????? ???? ??????????? R6 ??? R7 ??? ???????? ??? ???????, ? ?????? ??? ??????? , ???? ?????? ????? 7.8V (?????? ?????? ???????? IC1, ??????), ??? ? ??????? ??????? ?????? ??? LED D10-D11 ?????? ?? ????? 3 db. ?? ?????? ????? ??? ??????????? ?????? ?? ???? ??? ?????????? ?? ????? ??????????? ?????, ???? ??? ???????????? ?? ?? ????? ??? LED.

  A circuit of measurement of level based on a typical application of National. The circuit round the IC1 makes input adaptation and amplification with the trimmer TR1 [GAIN]. The circuit round the IC2 makes half-wave rectification of acoustic signal. With switch S1, we select the type of indication, that we will have from the LED. With the prices in resistances R6 and R7 that exists in the circuit, the level of signal, in the entry is 7.8V (gain of first stage IC1, is one), and the difference of level between the LED D10-11, should are 3 db. The positive department of supply, should have the possibility of giving more current, one and it is overloaded with the current of LED..

Part List

R1-2=10KohmC1=100uF 25VD1-19=LED 3 or 5mm any colour.
R3-4=10KohmC2-5=10uF 25VD20-21=1N4148
R5-8-9=1KohmC3-4=100nF 100V
R6=330KohmC6=1uF 25VIC1=TL 072
R7=62KohmIC2=LM3915
TR1=47KohmTrimmerS1=mini SwitchIC3=LM3916

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