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Last Updated: December 31, 2017 06:44 AM

Capacitance Proximity Switch
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Caboose Marker Flashing Red LED Light -  A circuit that drives a red LED from a 1.5 volt battery and simulates an incandescent light.  Duty cycle can be changed by selecting resistor values __ Designed by Dick Cappels

Candle Simulator -  This PIC  Project  uses a PIC  to simulate the flickering of a candle entirely in software.  The brightness of the lamp is controlled by doing PWM (pulse width modulation) of the power to the lamp.  A random number generator controls the flickering amplitude.   __ Designed by Luhan Monat - Mesa Arizona

Car Network Device -  PIC  Project  Our present car controller runs on a single PIC 16F870 micro and provides functions for remote door locks, headlight reminder, and car finder.  it is constructed using wire-wrap to allow for future expansion and is mounted using Velcro on the passenger side of the center console __ Designed by Luhan Monat - Mesa Arizona

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.  __ 

Cat Toy with a Small Weighted Motor -  The PIC 12F675 is small in size and low in power.  it lends itself to some really off-beat uses __ Designed by Luhan Monat - Mesa Arizona

Charge pump with ultraLow quiescent current -  08/05/04  EDN Design Ideas:  Portable battery-powered devices often spend most of their life in standby mode, in which the quiescent current of an internal boost converter continuously bleeds the battery.  The quiescent current during standby can be larger than  __ Circuit Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA

Circuit Monitor 2 -  PIC  Project  This is a circuit monitoring device.  it runs for over 10 days and can log up to 32k events both digital and analog.  Samples are logged either on a timing basis (.01 to 2.5 seconds) , or on a triggered basis.  Four inputs are provided, up to three of which can be analog __ Designed by Luhan Monat - Mesa Arizona

Cockroach Zapper -  Using a PIC  for this device provides a lot of useful functionality.  The timing for the power pulse to the inductor is critical to getting the best Zap from your nine volt battery.  The longer the current is on, the higher the voltage.  Once the inductor reaches saturation, however, you are just waisting power.   __ Designed by Luhan Monat-Mesa Arizona

Color Organ -  This is a simple, one lamp colour organ.  it is far less complicated then the Three Channel Colour Organ.  it is simply a lamp controlled by an SCR.  it can be built in a few minutes, and combined with other circuits to make some pretty neat effects.   __ Designed by Aaron Cake

Color Organ -  PIC  Project  This unit uses a PIC 16F84 with an 8 bit A/D.    The signal from both stereo channels is combined and digitized.    Each of 5 frequency bands is processed using a 16 point FFT.    Then the level of each channel is output as PWM (pulse width modulation) to a set of solid state relays __ Designed by Luhan Monat - Mesa Arizona

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 as each is turned on individually.   __ Contact David Cook

Colour (Sound) Organ -  This is a simple, one lamp colour organ.  it is far less complicated then the Three Channel Colour Organ.  it is simply a lamp controlled by an SCR.  it can be built in a few minutes, and combined with other circuits to make some pretty neat effects.   __ Designed by Aaron Cake

Combination Lock -  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  in practice this circuit is capable to lock or time all the devices that can be connected to relays.   __ Designed by Projects & Ideas from Nutchip.com

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.  See movies of a thermistor in action as well as a reflective or interrupt-based photosensor counting.   __ Contact David Cook

Computerize Your Room/Home -  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. __ Designed by Aaron Cake

Configurable RS232 to Ttl to I2c Adaptor -  RS232 signals cover a much longer distance than standard TTL and i2C signals.  Also, RS232 signals have better noise immunity.  RS232 is a well-known standard supported by many popular integrated circuits...__ Electronics Projects for You

Controlling a Stepper Motor using a Rotary Encoder -  Presented here is a project to control a stepper motor using an incremental rotary encoder.  it consists of a Raspberry Pi (Raspi) board, 5-pin rotary encoder, 5V stepper motor and an...__ Electronics Projects for You

Copper & Steel Thermocouple -  Thermocouple Made From Ordinary Copper And Steel Wire.   __ Designed by Nyle Steiner K7NS

Corona Oscillator & Corona Triode -  Corona Oscillator And Corona Triode.   __ Designed by Nyle Steiner K7NS

Cricket Monitor -  PIC  Project  This device listens for 'crickets' - little transmitters that bleep out their condition periodically.   __ Designed by Luhan Monat - Mesa Arizona

Custom made Boxes for Projects -  Easy to Make Boxes of Many Sizes and Shapes.   __ Designed by G.L. Chemelec

Daytime Running Lights Controller -  Auto makers have been gradually switching to light emitting diode (LED) lighting for automotive headlamps because of its features such as high efficiency and long service life.  in addition, from a...__ Electronics Projects for You

Decimal to BCD Convertor -  This circuit will provide an output in Binary Coded Decimal from any of the input switches.  The input switches may be expanded to 16 switches, providing a Hexadecimal to BCD conversion  __ Designed by Ron J.

Decimal to BCD Decoder -  Miscellaneous:  This is a keypad circuit that will convert the decimal value of any keypad switch - Into its BCD equivalent. __ Designed by Ron J.

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 __ Designed by Projects & Ideas from Nutchip.com

Design & Analysis Of a Single-Stage Transistor Amplifier using C++ -  Design and analysis of single stage amplifier using C++.  Many formulae are required to calculate the parameters involved in a circuit of a transistor based audio amplifier.  Some of these values involve resistors, coupling capacitor, bypass capacitor, power consumption, current flowing through different components.  A good amount of time is required to calculate such parameters even with a regular calculator.  Using C++ program, all the parameters can be calculated in a fraction of a second.  This project presents a single-stage transistor audio amplifier that requires a total of 19 formulae to obtain the values of components and analyse the circuit.__ Electronics Projects for You

Design & Construction of Radio Frequency (RF) Oscillators -  Every oscillator has at least one active device (smarties don't complicate matters for me - just read on) be it a transistor or even the old valve.  This active device and, for this tutorial we'll stick to the humble transistor, acts as an amplifier.  There is nothing flash about that.  For this first part of the discussion we will confine ourselves to LC Oscillators and i'll keep the maths to an absolute minimum.__ Ian Purdie

Desktop Power Supply -  Useful for electronics hobbyists, this linear workbench power supply converts a high input voltage (12V) from the SMPS of a PC into low output voltage (1.25 to 9 volts).  An adjustable...__ Electronics Projects for You

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, the selected voltages  __ Designed by Andy Batts

Digital Lock-In Milliohmmeter -  A milliohmmeter is just the tool for checking trace resistance on a printed circuit board, tracking down shorted traces, and measuring the contact resistance of a switch or connector.  its the kind of tool that would come in real handy occasionally, but not often enough to justify shelling out hundreds of dollars.  Wanting one anyway, I set out to make my own.  it turned out to be not only an exciting project, but a true adventure of discovery as it provided a window into the workings of lock-in amplifiers __ Designed by Dick Cappels

Digital RF Field Strength Indicator -  Useful as a transmitter tune-up meter or an RF sniffer, this is an RF field strength indicator that is loosely based on the Broad Band RF Field Strength Probe, described elsewhere.  it detects RF via a square law detector, basically its a crystal set with gain.  The bias circuit for the detector is significantly modified from the probe to reduce the effects of battery voltage droop during use.   __ Designed by Dick Cappels

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 __ Designed by Dick Cappels

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.   __ Designed by Projects & Ideas from Nutchip.com

DIY 2^16 encoder based on PIC -  This code is WORK iN PROGRESS, use at your own risk.  This encoder can transmit the state of up to 16 TTL digital inputs using an RF or infrared transmitter.  When enabled, the included modulator automatically generates  the 38kHz iR carrier.  Containing a PIC  microcontroller, the circuit is very flexible.  You can decide which transmitter inputs will trigger a transmission.  You can control the receiver outputs to be latched or momentary with the LATCH input.   __ Designed by Peter Jakab

DIY 4-Digit LED Digital Voltmeter Module based on ATmega8 -  Three Voltage Ranges (DC: 1000V, 100V, 10V, AC: 700V, 70V, 7V) as well as an onboard Shunt (1Ω) allows to measure Voltages and Currents.  A DC/DC Converter offers galvanic isolation from the Supply.  An Atmega8 with a 10 bit A/D Converter as well as an onboard Precision Voltage References make this an useful and educational utility. __ Designed by Alexander C. Frank, aka Ajarn Changpuak

DIY 50W Amplifier based on ICL8063 -  This is a handy, easy to build general purpose 50 watt amp.  The amp has an input for a radio, TV, stereo or other line level device.  it also has a phono input for a record player, guitar, microphone.   __ Designed by Aaron Cake

DIY BFO metal Detector -  BFO (beat frequency oscillator) metal detectors use two oscillators, each of which produces a radio frequency.  One of these oscillators uses a coil of wire that we call the search loop.  The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the reference oscillator.  By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note __ Designed by Essex Metal Detectors

DIY Bias Probe -  DiY Bias Probe __ Designed by Guitar Effect RC Keen

DIY Bias Probe -  DiY Bias Probe __ Designed by Guitar Effect RC Keen

DIY Cell Phone Charger -  it seems that as cell phones become more sophisticated, their operating times become shorter and shorter.  if you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . Hobby Circuit designed by David A. Johnson P.E.-August, 2009

DIY COPPER WIRE  RESISTORS -  The first time I The first time I had to make a resistor, I was in an apartment in Bangkok, well more than an hour's ride and half an hour's walk to the nearest electronics component outlet.  Basically, it would have been a half day trip to go out and look for a 0.1ohm resistor that I needed for the EDFET amplifier breadboard.  I needed a ballast resistor to go between two emitter followers.  Something small fraction of an ohm would do, so I reached for a spool of magnet wire.   __ Designed by Dick Cappels

DIY Digital AC Watt Meter -  Have you ever been curious about the power consumption of an appliance? For example did you wonder how much it will cost you to leave your television in standby mode whole night? Or did you want to learn how much change your refrigerator settings will make on your electric bill? if your answer is yes, you can use a wattmeter to measure the power consumption of a device.  in this project we are building one.__ 

DIY Dual Directional Coupler, 5-1000 MHz, 20 dB -  This is not a new invention.  it's just a hack together of some (very) nice parts.  And the result is an 'even nicer' part. (So we think :-)  __ Designed by Alexander C. Frank, aka Ajarn Changpuak


Electronic Construction Projects: 
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