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CarButtons - Interfaces car's "media control buttons"
(usually on steering wheel) to PC using USB. It is also compatible with many
other resistive input devices, even home-made buttons. (project added
08/08/08) |
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Casio QV-200 Digital Camera Cable. - Lose your cable? Build it
yourself and save $29. Fits many QV models. (electronic project
added 2/06) |
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Color Sensor for Robot - I'm developing a simple, active, color,
object sensor for my robots based on three ultra-bright LEDs. An
old-fashioned cadmium-sulfide sensor detects the brightness of the reflected
red, green, and blue... |
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Combination Lock (nutchip) - Combination lock are nice to enable
alarms, but are useful for controlling a wide range of electric devices.
These software keys can open gates, garages, TV sets, telephones, VCRs, well
pumps.... |
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Combination Tachometer, Thermometer, & Counter - Inspired by the
need to measure dc motor speed and detect overheating, this 68HC908KX8
microcontroller-based circuit displays various statistics on six-digit,
eight-segment, numeric LEDs.... |
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Computerize Your Room/Home (Aaron Cake) - So you've read about my
Computerized Room or have seen those nifty home automation products advertised
in the back of electronics magazines? Or perhaps someone you know has done something
similar. At any rate, you have decided to try it yourself. The first thing I will say,
however is that it is not cheap. You will first need a computer, but since your
reading this, I assume that you already have that taken care of. Second, you will have
to buy about 20 IC's and a very expensive ISA experimenters prototyping board. These
boards cost anywhere from $16 to $45, and can be purchased from your local electronics
store or from Jameco Electronics (See Where To Get Parts). They have a fairly wide
selection. Buy the 8 bit version, the 16 bit varsion is not needed for this
project.... [Aaron Cake] |
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Constant Current Power Load - Suitable for testing power supplies to 100
watts. (electronic Construction Project added 09/06) |
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Decimal to BCD Decoder - This circuit will take the input from a keypad with
up to 16 buttons, and convert it into a ''latched'' BCD output. (Circuit design
added 6/07) [Ron J.] |
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Delayed Start for Appliances - your washing machine lacks this useful
feature?This special timer will power it only when you want to. Say goodbay to creasy
clothes because of the time spent waiting in the machine. And if your problem is
limited overall electric power, you can set up the washing machine and the dishwater
at the same time, having them working at different hours (electronic design added
6/07) |
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Design & Construction
of Radio Frequency (RF) Oscillators - (electronic schematic / circuit added
2/05) |
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Desktop Power Supply from a PC - This ATX PS board has leads for +5 (RED),
-5 (WHITE), +12 (YELLOW), -12 (BLUE) volts, Ground (BLACK) and switch (GREEN). Dell
power supplies manufactured between 1996 and 2000 do not follow the industry standard
pinout and color codes. The fan has also been unplugged for better viewing. Since this
PS was converted for use in the logic and robotics labs, t....(electronic project
added 2/06) |
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Dice (nutchip) - A LED dice, bright, unbiased, and spectacular. The
display uses 7 LEDs to simulate the faces of a real dice…. (electronic design added
6/07) |
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Digital Lock-in Milliohmmeter - (circuit added 6/07) |
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Digital RF Field Strength Indicator - (circuit added 6/07) |
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Digital wireless for the bench top ATtiny12 - This section describes
an experimental low power, low bandwidth data signaling system that was initially made
to operate at 55 MHz (television channel 2 in the U.S.). Before operating a radio
transmitter, find out what kind of transmitter operation, if any, is permitted in your
locality. Radio transmitter operation is a serious legal matter. This design....
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Display-Counter - Using a 4511, a specialized decoder IC, learn how to
drive a 7-segment display. The article explains the technique for counting from zero
to nine. this technique is the base for more complex applications, like a countdown
timer or a gear display for a motorcycle. (electronic design added 6/07) |
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DIY Electrostatic Headphones - Electrostatic headphone built in the
enclosure of an old pair of dynamic headphones. The author gives detailed instructions
for constructing the electrostatic transducers and a high voltage amplifier from PA
transformers. Designed by Andrew Radford (Circuit design added 04/05/06)
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DIY Electrostatic Loudspeaker Part 1 - An ESL using ready made panels
available exclusively from ESP. Part 1 .... |
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DIY Electrostatic Loudspeaker Part 2 - ESL cabinet details. Part 2
.... |
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DIY Electrostatic Loudspeaker Part 3 - ESL Transformers and Power Amplifier
Details. Part 3 .... |
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DIY Front Panels - ….must register on this site.... [Published in Elecktor
July/August 2010] |
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DIY Hard Drive Clock - The hard drive clock is quite possibly the best diy
electronics paperweight I have come across. Even though it has no particular use, it
is uber cool. The clock requires a PIC 16f628 microcontroller, and old hard disk, and
some miscellaneous components.... |
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DIY Headphone Amplifier With Natural Crossfeed - Some crossfeed acoustic
simulators suffer from frequency-response anomalies (called Comb-filter effects)
because they use a fixed, frequency-independent delay in the crossfeed signal. The
author has developed a crossfeed filter/headphone amplifier with frequency-dependent
delay that eliminates the Comb-filter effect. It is constructed....Designed by Jan
Meier (Circuit design added 04/05/06) |
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DIY Lie detectors - Makezine recently posted a diy lie detector kit that
uses your skin resistance (aka sweat) to detect a lie. The kit is well explained and
consists of two probes you place on your palm with a red/green led readout….(project
added 6/07) |
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DIY remote control based on PIC - Control up to 8 devices by this easy
constructable remote control. It can work as a radio or infrared remote control,
depending on the components. Each device output can be configured to be momentary
(turned on while you press the button) or latched. Latched outputs can be toggled
on/off by one button per channel, or turned on and off by two buttons per channel….
[Peter Jakab, Electrical Engineer, Engineer of Informatics] |
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DIY Serial MIDI Interface 80C51/80C31 Version - (diagram added 2/07)
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DIY SMD Adapter - ….must register on this site.... [Published in Elecktor
July/August 2010] |
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Door chime Privacy Sentry ATtiny12 - An ATtiny12 controller as a timer and
some switching circuitry turns the doorbell off for 10 hours at the same time each
day….(schematic / circuit added 6/07) |
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DS: 3 channel 8 bit EEPROM DAC with DS interface - (circuit added 6/07)
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DS: Clock/Calendar/Alarm with EEPROM-based interpreter & DS Interface -
(schematic / circuit added 6/07) |
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DS: Firmware based protocol for low priority data transfer - (circuit added
6/07) |
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DS: Test & development tool for DS interface - (circuit added 6/07)
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DTMF Tone Decoder - hears touchtones and displays them as telephone numbers.
(electronic project added 2/06) |
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Dual Fan Controller (David Cook) - A birthday present gone too far. An
overengineered temperature-based automatic twin fan controller with brass face to keep
a kitchen PC cool. (project added 10/06) |
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Dual Mode Superhet/Direct Conversion AM receiver for 181.818 kHz Lowfer ATtiny2313,
AT90S2313 - This is a description of an experimental AM receiver for VLF. It
is crystal controlled to receive 181.818 kHz (more or less) and operates as either a
single conversion superhetrodyne or a direct conversion receiver. The bandwidths are
expected to be 15 Hz to 3.5 kHz in superhet mode and 15 Hz to 10 kHz in the direct
conversion mode. Operation is from a singler.... |
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