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Audio Graphic Equaliser - simple 7 band equalizer (added 4/02) |
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Audio Level Meter - The circuit has a flat frequency response from about 20Hz to
well over 50Khz. Input sensitivity is 100mV for a full scale deflection on a 100uA
meter. Built on two common emitter amplifiers, the first stage has a preset resistor
which may be adjusted for a FSD.....(schematic design added 7/03) |
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Audio level meter VU Meter - This circuit uses just one IC and a very few number
of external components. It displays audio level in terms of 10 LEDs. The input
voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a
monolithic integrated circuit that senses analog voltage levels and drives ten LEDs
providing a logarithmic 3 dB/step analog display. LED current drive....(added 9/06) |
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Audio Tone Control - designed by Aaron Cake (circuit added 7/02) |
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Automatic Loudness Control - Simple add-on module Switchable "Control-flat"
option (added 3/05) |
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Better Volume Control - how to create a log pot that is better than the "real"
thing (Electronic Schematic / circuit added 4/02) |
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Build a Simple Soft Action Muting Switch - 10/14/04 EDN-Design Ideas: The circuit
in Figure 1 adds a soft muting switch with power-up/power-down muting to a line-level
audio circuit. R4, C1, and JFET Q1 quietly ground a signal in 100 to 200 msec when you
close S1 or release it when you open S1. Potentiometer R2, set to twice Q1's cutoff
voltage, makes on/off transition.....(design idea added 10/05) |
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Designing with the LMC835 Digital Controlled Graphic Equalizer - National
Semiconductor Application Note 04-Nov-1995 (app note added 4/02) |
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Digital Delay Unit For Surround Sound - The Mitsubishi M65830 Digital Delay IC has
been discontinued (for reasons beyond my comprehension), and so far a suitable
replacement device has not been found. This means (of course) that you will be unable
to build this delay circuit. I have left the project in place as reference, and the
overall connection schematic is still valid if (when?) a replacement for the M65830 is
located. The project will be updated at that time. In the meantime, just ignore the
delay circuit .... (schematic / circuit design added 9/02) |
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Digital Volume Control has Log Taper - 04/11/02 EDN-Design Ideas: Digital
potentiometers provide a compact and convenient way to attenuate audio-amplifier
signals. However, most such potentiometers suffer from at least one flaw: a
nonlogarithmic step increment. To avoid this problem, a user must usually step the
potentiometer in a nonlinear sequence to simulate a logarithmic taper.....(design idea
added 12/04) |
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Dual Channel Digital Volume Control - (electronic Circuit / Schematic added 10/04) |
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Easy Parametric & Graphic Eq's Plus Peaks & Notches - (electronic circuit added
8/02) |
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Generating Tone using Pdo - Toshiba 870X Series Application Note (added 2/06) |
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Guitar Control - CaStand-alone, 9V battery powered unit . Three-level input
selector, three-band tone control (added 3/05) |
