It is a simple circuit of optical index of level of sound signals, adapted in various needs of user. It can be adapted in various levels of entry, regulated from trimmer TR1 (Level) - TR2 (Gain), then it is rectified by the D1-2 (cutting off of negative periods of signal-rectification) and drived to the main circuit of index, that it is constituted by D3...D13 , the transistors Q2-Q13 and the materials that exist around them. The optical index him we take from the line of LED LD1-13. The each led turns on when the level is altered at 0,65V roughly. The requirements in current are 100 ma with complete index. We can add all units LED we want, always calculating the current where they will need the news LED. [TABLE="width: 100%"]
Part List (Malzeme Listesi)
R1=47Kohm
R24-26-28-30=4.7Kohm
R2-3 =1Mohm
TR1=100Kohm Trimmer
LD1-7=LED Green
R4-R7=1Kohm
TR2=4.7Kohm Trimmer
LD8-10=LED Yellow
R5=100ohm
C1=10uF/25V
LD11-13=LED Red
R6=18Kohm
C2=100nF/100V MKT
D1-13=1N4148
R9-11-13-15-17=560ohm
C3=4.7uF/25V
Q1 ....Q13=BC550C - BC549B
R19-21-23-25-27=560ohm
C4=4.7uF/25V
IC1=TL071
R29-31=560ohm
C5=10uF/25V
IC2=7812 [With Heatsink]
R8-10-12-14=4.7Kohm
C6=47uF/25V
R16-18-20-22=4.7Kohm
7-8=100nF/100V
All Resistors is 1/4W 1 -5%
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