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Electronic Projects to Build
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Last Updated: October 18, 2017 05:04 AM

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


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

1.5 Volt 1970's Style 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

10 Amp 13.8 Volt Power Supply -  Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers.  The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack.  it should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price.  Of course rolling our own gives us the ability to customize the circuit and make it even more reliable than commercial units.   __ Designed by N1HFX

10 W Experimental Output & 1 Meter Loop Antenna for 187 kHz Lowfer  -  This page describes an antenna, a 1 watt final output stage, and a transformation network for radio experiments at 187 kHz __ Designed by Rod Elliott  ESP

12V 10A Dark Activated Switch -  The DAS1 kit can be used to automatically turn on 12V lamps when it becomes dark.  it has an on-board switch for selecting Off, Always On and On-at-Dark (Auto) operation.  The DAS1 can control up to 10 Amps of 12V DC lighting, it also includes two ultra-bright white LEDs for a low power self-contained light source.  The DAS1 is perfect for controlling external arrays of 12V white LED lamps, 12V fluorescent lamps and 12V incandescent lamps.  Use it for indoor/outdoor accent lighting, street lighting, security lights, automatic highway signs and more.   __ Designed by Solar Orbit Kit

12V 15A Low Voltage Disconnect -  The LVD1 kit is used for automatically controlling the power to 12V solar-powered battery-operated electronic devices.  it shuts down power when the battery voltage drops to a selected voltage, protecting the battery from damaging excessive discharge conditions.  Power is either automatically or manually reconnected at a selected voltage when the battery is recharged.  An adjustable low-voltage indicator warns of the impending power outage.  The low-voltage signal is externally available, allowing computers to monitor the condition and perform a graceful shutdown.  The low-voltage signal can also be used for triggering a variety of low-voltage warning systems. 
 __ Designed by Solar Orbit Kit

12V 20A Solar Charge Controller -  The SCC3 kit is the heart of a 12 Volt solar power system, it regulates the charging of batteries from photovoltaic (PV) solar panels.  A charge controller is an essential part of any solar power system.  A 12 Volt solar power system can provide power to a wide variety of devices such as lighting systems, Ham and CB radios, car stereos, cell phone chargers, laptop computers, televisions, recording equipment, fans, water pumps and other 12V DC loads.  With the addition of a DC to AC inverter, the DC power can be converted to 120 Volts AC for running many household electronic devices. 
 __ Designed by G. Forrest Cook

12V 9A Solar Power Center -  The SPC3 kit contains all of the circuitry for a medium-sized solar power system.  it includes a solar charge controller for battery charge regulation, a smart on/off power switch with automatic low voltage disconnect operation and a built-in white LED lighting system.  Additional lights and other 12V devices can be connected to the load terminals and controlled by the SPC3.  The SPC3 can regulate up to 9 amps of incoming solar power and can switch an external load of up to 10 amps. __ Designed by Solar Orbit Kit

12V Battery Absorb & Float Charger -  Most battery chargers stop charging the battery when it attains its maximum charging voltage set by the circuit.  This circuit charges the battery at a particular voltage, that is, absorption voltage, ...__ Electronics Projects for You

12V LED Battery Voltage Monitor -  The BVM1 kit can be used to monitor the voltage of a 12 Volt battery.  it features ten ultra-bright LEDs in five vivid colors for quick battery voltage measurement.  One of the LEDs will briefly blink on every 1.25 seconds, keeping average power consumption low.  The display is readable from dark to full sunlight.  A switch-controlled low voltage beeper is included, this provides a warning when the battery voltage drops below a preset value and can help to prevent excessive discharge.   __ Designed by Solar Orbit Kit

1750 Meter Lowfer Band Amplitude Modulated RF -  The 74HC4060 oscillates at 6.000 MHz, and is divided by 32 to get 187.5 kHz.  Pin 5 of theCD4060 is a 732 Hz square wave which can be used to modulate the output stage rather than using a micro controller, but in this instance, the modulation __ Designed by Dick Cappels

1kw Sine Wave Inverter -  An inverter provides power backup for mains-based appliances in the event of a power failure.  Most of the inverters available in the market have complicated circuit design and are not very...__ Electronics Projects for You

2 Way IR Terminal -  This unit provide 2 way iR communications using a numeric keypad and an LCD display.  Data is sent and recieved in acsii with no regard to what the data means to any particular device __ Designed by Luhan Monat-Mesa Arizona

2-250 MHz Synthesized, 1 Hz Resolution, PC controlled source -  A Homebrew network analyzer, with full calibration!  (Featured in QEX)  __ Designed by Steve Hageman

300 MHz AM RF Remote Control System -  if you plan to build this project, simply replace the RE-99 receiver & TX-99 transmitter with the RWS-434 & TWS-434A RF receiver & transmitter modules found HERE.  These circuits will work with any RF transmitter and receiver modules.  Due to the huge interest in this project, I have just recently finished the NEW schematics.  The older schematics were scanned and pretty poor quality.  These new ones should make it considerably easier to recognize the parts used for the project.   __ Designed by Reynolds Electronics

38-kHz IR LED -  infrared LEDs are commonly used for object detection in robots.  Blinking the LED on and off 38, 000 times a second improves long-range detection and reduces false triggers.  Pictures, comparisons, and a schematic demonstrate a simple, reliable, low-power 555 CMOS circuit.   __ Contact David Cook

3-phaseProgrammable Controller for ON/OFF Motor -  Automatic on/off controller for a 3-phase electric motor can be made with a programmable time switch.  in this case a maximum of eight time durations can be programmed.  The system has two...__ Electronics Projects for You

4 MHz Amplitude Modulated RF Source -  A while back I needed an amplitude modulated signal source at 4 MHz.  This circuit was literally thrown together with parts laying on the bench.  I built it dead bug style on a piece of copper clad board.  it should work with little or no modification, other thano get it to oscillate, and at higher frequencies, you might have to reduce the capacitor values a little.  Just be __ Designed by Dick Cappels

4-Channel Multi-Mode Audio Amplifier -  Sometimes we need configurable multichannel amplifiers for experiments or for use in offices or schools.  Here is a circuit based on TDA1554Q, configured for multi-mode function with four channel outputs.Circuit and...__ Electronics Projects for You

4-Channel Video & Audio Sequencer -  This next project is a simple circuit for switching your CCTV camera outputs sequentially.  it switches four video and audio channels sequentially, one at a time. it is built around a 555 timer few other components.  The timer is configured as an astable multi-vibrator.  A single-side PCB of the four-channel video and audio sequencer is provided along with the component layout.  After assembling the circuit on the PCB, enclose it in a suitable plastic box.__ Electronics Projects for You

5301 Wideband Fuel Mixture Display -  This is the construction guide for the 5301 wideband fuel mixture display kit.  The 5301 is the Tech Edge version (rather than the Jaycar version) of the modified Silicon Chip FMD design, and it features, compared to the original kit, double sided PCBs a new front panel design, in-built RS232 output and superbright GaAlAs 7 segment LEDs The 5301 uses the same version 1.1 software as the 5300 and, unless noted otherwise, is known elsewhere on this web site as the 5300 unit or the modified FMD display.   __ Designed by Peter Gargano 2002

555 Timer as an A/D Converter -  Measure voltages accurately with a microcontroller using this simple circuit.  includes sample program for the Parallax Basic Stamp.   __ Designed by Bob Blick

5V From Portable Wind Turbine -  This project deals with the design and development of a portable wind turbine unit, capable of generating electricity from the kinetic energy in the wind.  The circuit requires a DC motor, ...__ Electronics Projects for You

6V ultra-bright LED chaser using 74HC4017 -  This is a spectacular but completely useless project.  it lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very briefly.  The LEDs light-up going around and around since they are mounted in a circle (on a CD) , then they pause __ Designed by Audioguru

8 Channel PWM Code AVR Controllers -  This article is about a software controlled, parallel port-interfacing 8-channel Pulse-Width-Modulated fan controller __ Designed by Dick Cappels

90 MHz voltage controlled oscillator for FM Band  -  Notice the abundance of 2N4401, 1 k resistors and 330 Ohm resistors? That's because I have a lot of each.2N4401's weren't intended to be used as varactors, but they work just fine.  Don't be afraid to experiment with the parts you have on hand.  Build this on a ground plane board.  Layout is important.   __ Designed by Dick Cappels

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Electronic Construction Projects: 
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