Bar-Graph Compression Indicator following circuit simple schemati

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Bar-Graph Compression Indicator following circuit simple schemati

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THAT Corporation Design Note
Bar-Graph Compression Indicator
following circuit simple schematic indicating dynamic range compression with bar-graph. also illustrates basics using bar-graph indicators. bottom half schematic shows simplified version typical side-chain processing often used with THAT 4301, with slight change gain scaling. signal that will drive bar-graph picked Compression Ratio potentiometer. chosen that, parallel with R16, loading potentiometer gives about compression ratio center pot's adjustment range. With gain scaling shown, gain control constant output 4558 52mV/dB, output will approximately 20dB compression. output connected positive inputs U1A-D, U5A-C, which quad comparators manufactured National Semiconductor. negative inputs these devices connected individual taps resistor chain composed R10, R11, R20, resulting comparator trip points 1dB, 2dB, 3dB,6dB, 9dB, 12dB, 20dB compression. bar-graph elements essentially connected series, with individual taps which consecutively short elements bar-graph level compression increases. Power LEDs provided simple current source formed R21, R26, which temperature compensated. Note that comparators have hysteresis. This result their oscillating transitions, situation which ignored, remedied adding small capacitor across inputs each comparator. problem ignored, sure plenty de-coupling (which would anyway) watch your layout that currents associated with this "chatter" affect rest circuit. also need some series resistance power supplies effectively isolate this circuit.
Copyright 2000 THAT Corporation. rights reserved.
Corporation
Sumner Street, Milford, 01757-1656 tel: 9200 fax: 0990 web: www.thatcorp.com
Applications Notebook Volume Design Note Sheet Revision 12/6/0
LEDBAR7 100R
Copyright 2000 THAT Corporation. rights reserved.
20dB Compression 12dB Compression Compression
624mV
2N2907A Compression
Compression Compression 104mV
468mV
1040mV
Compression 312mV 156mV
52mV
THAT Corporation Design Note
LM339B LM339B 40k2 392k
Increase
LM339B LM339B
LM339
LM339B 52mV/dB
LM339
1N4148
Increase
Threshold
1N4148
Corporation
20k0 1k43 20k0 Compression Ratio Increase Gain V590k
100n 3300ppm
input 4301P 4301P
Bar-Graph Compression Indicator
control port
Sumner Street, Milford, 01757-1656 tel: 9200 fax: 0990 web: www.thatcorp.com
28k8 2M00
4558 20k0
1M65 3300
4301P
Applications Notebook Volume Design Note Sheet Revision 12/6/0

Bar-Graph Compression Indicator following circuit simple schemati

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