Signal level indicator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Signal level indicator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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The indicator is designed to indicate the input / output levels in the nodes of audio equipment. It is also possible to connect to the output of a power amplifier.

Signal strength indicator

R3 .... R14 - 2,4 kOhm

R1=R2=18 kOhm - for sensitivity 250 mV,

R1=R2=2,4 kOhm - 50 mV,

R1=R2=10 kOhm - 100 mV,

R1=R2=39 kOhm - 500 mV.

If the indicator is connected to the output of the power amplifier, then R1 = R2 = 330 kOhm (for UMZCH 30 W) The diode glow delay time can be adjusted by changing the RC circuits at the input. The power supply of the indicator depends on which microcircuit is used in it: U pit KA2281 (TA7666, TA7667) = 3,5 .... 13 V. U pit KA2283 = 9 ... 15 V.

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