NEW Archer Radio Shack Project Board • LED VU Meter • 277-116

Description

Untitled Document
New Unopened
Archer Radio Shack Project Board • LED VU Meter
Catalog # 277-116
This package contains a complete pre-drilled circuit card for
constructing a Light Emitting Diode (LED) VU
Meter. It also contains panel labels for vertical or
horizontal mounting .
This LED VU Meter is a logarithmic responding
device , designed specifically to be added to an
existing electronic circuit system. Connect an audio
voltage to the input and you'll obtain an output
indication similar to an analog VU Meter.
An advantage of this " meter" is its fast response time
(no meter ballistics to 'upset rapidly changing signal
readings) and of course is highly visible (no need to
carefully read and interpolate that pointer reading) .
Following the instructions, you' ll have a VU Meter
which responds to 3 dB levels ; however, by fol lowing
some simple notes ana suggestions, you can
set up any other increment you desire.
SPECIFICATIONS
Frequency Response . 20 - 20,000 Hz +O , - 1 dB
Transient Response . ..Onset of steady tone : 1.6 dB overshoot at 0.05 seconds , settles to within 0 .5 dB
within 0 .1 second .
Accuracy ... .. ... ... .. . ±0.4 dB per step maximum, ±.0.15 dB
per step typical.
Input Impedance
IN1 ... . ... . . . .. .. .......1 Meg Ohm
IN2 ........... . .. ~ .........100K Ohm
Sensitivity .. ................. See table below.
Vee POWER DRAIN
5V 3 - 55 mA
9V 3 - 110 mA
12V 3 - 135 mA
15V 3 - 150 mA
Sensitivities specified in the table are for the
threshold of the next to last LED to light (0 dB) .
Lowest level LED thresholds are 18 dB lower.
Includes 15 page instruction booklet.
Table of Contents
Parts
Mounting of Parts
Installation
Mounting
Calibration
Theory of Operation:
Amplifier
Ladder Network and Comparator Stages
Active Low Pass Filter
Active Rectifier
Reference Voltage Circuits
Experimenter Options
Troubleshooting
Functional Block Diagram
Schematic
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