Ghani Lawal- Looked into IC's will be
using LM3915, possesses
logarithmic scale, adjustable reference voltage and adjustable LED supply
voltage - LM3914 vs LM3915 vs LM3916 -
What are the differences?
- Manufacturer discontinued making it, have one vendor on prime that can get it to me next week Friday
- A precision (inverting) rectifier uses
op-amps to compensate for the voltage drop across the diode
- Correct amplification ration (R1:R2) for compensating the voltage drop due to the diode only good for a single |Vi| value
- If R1 = 10k, Vd = 0.7V
- Vi = 10, R2 = 10.7k
- Vi = 1, R2 = 17k
- A "superdiode" (precision non-inverting rectifier) can be used instead
- ***LM3915 has recommendations on what type of rectification should be used in the input signal, leaning towards precision full wave peak detector
Volume Meter IC and Adjacent Circuits
A project log for Music Spectrum and dB Visualizer
Receive input from a 3.5mm jack, divides the music into 7 frequency bands, shows the loudness of each frequency band in DB using LEDS.
Discussions
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