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555 Timer MonoStable Circuit
using Pushbutton - The two
circuits above illustrate using
the 555 timer to close a relay
for a predetermined amount of
time by pressing a momentary N/O
push button. The circuit on the
left can be used for long time
periods where the push button
can be pressed and released
before the end of the timing
period. For shorter periods, a
capacitor can be used to isolate
the switch.. |
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A Better Volume Control - A
volume control using a linear
pot that is much better than
most log pots |
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A Stereo Digital Volume Control
based on the CS3310 - The
CS3310 is a complete stereo
digital volume control designed
specifically for audio systems.
It features a 16-bit serial
interface that controls two
independent, lowdistortion audio
channels. The CS3310 includes an
array of well-matched resistors
and a low noise active output
stage. |
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Active Subwoofer & Controller |
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AN011 Jitter Testing Procedures
for Compliance with AT&T 62411 |
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AN012 AT&T 62411 Design
Considerations Jitter &
Synchronization |
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AN016 Jitter Attenuation
Performance of the CS61575 &
CS61575A |
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AN543: Tone Generation -
Microchip Application Note
Published 26-Aug-97 |
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Audio Graphic Equaliser -
simple 7 band equalizer |
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Audio Level Indicator -
Audio Amplifier output relay
delay |
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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. |
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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.
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Audio Tone Control -
designed by Aaron Cake |
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Audio Tone Controls - Many
people at one time or other,
regardless of their interest in
electronics, have adjusted these
controls to suit their
preference. Whether its to boost
the bass of their favorite CD,
cut the noise / static on a talk
radio station or compensate for
poor loud speaker response,
they've reached for the treble
and bass tone controls. |
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Automatic Loudness Control -
Simple add-on module Switchable
"Control-flat" option |
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Beetle Mk III - This project
is based on our most stable FM
transmitter. It has a number of
features, with a volume control
to adjust the input level and a
small, neat box to make it
easier to attach to a guitar.
The volume control is positioned
at the end and when turned up
fully, the transmitter provides
fuzz (distortion). |
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Better Volume Control - how
to create a log pot that is
better than the "real" thing |
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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. |
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Calibrating the Current Offset
Bias (COB) Register for the
DS278x Family of Fuel Gauges
- Maxim App Note 4188 --
3/10/2008 |
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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 |
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Designing with the LMC835
Digital Controlled Graphic
Equalizer - National
Semiconductor Application Note
04-Nov-1995 |
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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 |
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Digital Volume Control -
This circuit could be used for
replacing your manual volume
control in a stereo amplifier.
In this circuit, push-to-on
switch S1 controls the forward
(volume increase) operation of
both channels while a similar
switch S2 controls. |
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Digital volume control (Aaron
Cake) - based on DS1669
Digital Pot IC |
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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 |
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Digital-Volume Control -
This circuit could be used for
replacing your manual volume
control in a stereo amplifier.
In this circuit, push-to-on
switch S1 controls the forward
(volume increase) operation of
both channels while a similar
switch S2 controls reverse
(volume decrease) operation of
both channels. |
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Dual Channel Digital Volume
Control |
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Easy Parametric & Graphic Eq's
Plus Peaks & Notches |
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Expandable Graphic Equaliser
- The project described in this
article is a constant Q, fully
expandable graphic equaliser.
Where most "conventional"
graphic EQ circuits have a Q
that is dependent on the setting
of the pot, this one maintains
the same Q at all settings. |
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Generating Tone using Pdo -
Toshiba 870X Series Application
Note |
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Guitar Control - CaStand-alone,
9V battery powered unit .
Three-level input selector,
three-band tone control |
