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Halogen light dimmer provides infinite control - 03/16/00 EDN-Design Ideas Modern lighting systems use halogen lamps, most of which run on 12V ac from a transformer. The dimmer circuit in Figure 1 can change the intensity of the light from zero to maximum. The dimmer operates at approximately 12V, unlike the usual ones that function by adjusting the firing angle of the 110 or 220V mains supply Design by Suded Emmanuel
HB-LED flashing beacon repurposes switching regulator - EDN-Design Ideas 08/04/2014 A classic, low-cost “switcher” IC is repurposed to flash a high-brightness LED in this minimal-parts-count Design Ideas - Design by T A Babu
H-Bridge - With a Protection against Having Two Positive Input Pulses. __ Designed by G.L. Chemelec
H-Bridge Motor Control with Power MOSFETS - In figure 1 we have a very basic H-bridge using two spring-loaded, single-pole, double-throw switches. The normally closed (NC) contacts are grounded and normally open (NO) contacts are connected to +12 volts. A DC motor is connected between the two commons. In its normal state, both motor connections are grounded through the switches. Both switches are spring loaded. __ Designed by Lewis Loflin
H-Bridge Motor Driver using Bipolar Transistors - The classic beginner’s DC motor driver circuit that appears in every electronics textbook is the bipolar transistor H-bridge. An H-bridge is an arrangement of transistors that allows a circuit full control over a standard electric DC motor. That is, an H-bridge allows a microcontroller, logic chip, or remote control to electronically command the motor to go forward, reverse, brake, and coast. __ Contact: David Cook
HC11 Controls the Stepper - Simple circuit with 16-pin Nitron chip 68HC908, easy analog setting, source code with ICC08. New s-record for 8-pin 68HC908QT2! __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik
Heart of LEDs - Here is a fun project that you can give to that "someone special". How about Mother's Day or did you forget St Valentine's Day?. __ Designed by © Grantronics Pty Ltd
Heart-shaped Badge - The badge consists of eight LEDs arranged in the shape of a heart. One LED is lit at a time and this 'chases' round the shape. It would be easy to adapt this project to create other shapes with the eight LEDs. __ Designed by John Hewes
Heat Control Unit - This circuit will turn the heater ‘on’ when the temperature of water falls below the lower limit set by you and turn it ‘off’ when the temperature increases above the higher...__ Electronics Projects for You
Heater Fan Controller - This device acts as a variable speed control for the heater blower in a car. It takes its power directly from the existing wiring and connects with just 2 wires. It will also work for any 12 volt device up to 10 amps __ Designed by Luhan Monat-Mesa Arizona
Heating System Thermostat - This circuit is intended to control a heating system or central heating plan, keeping constant indoor temperature in spite of wide range changes in the outdoor one. Two sensors are needed: one placed outdoors, in order to sense the external temperature; the other placed on the water-pipe returning from heating system circuit, short before its input to the boiler. __ Contact: Flavio Dellepiane, fladello @ tin.it
HF/6m Tuner Preselector - Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU
HF/VHF mini portable tuner - If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do. A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device. The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna. __ Designed by Guy Roels ON6MU
HF/VHF portable antenna tuner - Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU
High & Low Voltage Cut Off with Time Delay - The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances like fridge and air conditioners. If a fridge is operated on low voltage, excessive current flows through the motor, which heats up, and get damaged __ Contact: IQ Technologies
High Accuracy RPM-Measurement with 68HC12 - Schematic + code __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik
High Accuracy Synchronous Step-Down Controller Provides Output Tracking & Programmable Margining - DN364 Design Notes __ Linear Technology/Analog Devices
High current bipolar stepper Motor controller - High Current Bipolar Stepper Motor Controller kit is based on chopper drive. Chopper drive is a method of providing a constant current source to a device. Chopper drive allows for use of higher voltage power supply for better performance and higher speed. It is uses SGS Thomson's L297 and L298 controller IC's. __ Designed by Rajkumar Sharma
High current PWM controller based around a 555 timer - Newly Revise Design NOW for Either N or P Channel Mos-Fet's __ Designed by G.L. Chemelec
High Efficiency Halogen Bike Light Dimmer - This circuit uses a PIC16F84 microcontroller with some software to control20-Watt12V DC halogen lamp
High Intensity Line Powered LED Flasher - There are times when you would like to generate an intensely bright flash of light using electrical power from the AC line. The circuit below can drive a one to three watt power LED with about 350ma of peak current. Since the circuit drives the LED with. . . Circuit by David Johnson P.E.-December, 2008
High performance single phase DC/DC controller with power system management - EDN-Design Ideas 09/24/2014 This DC-DC controller incorporates power system management and high-precision data converters Design by LTC Design Note
High Power Desktop LCD Backlight Controller Supports Wide Dimming Ratios While Maximizing Lamp Lifetime - DN264 Design Notes__ Linear Technology/Analog Devices High Power Flashing LED - The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash. This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 7 Mar 2010High Power LED Flasher - Power LEDs are becoming more popular these days. The DC input power to these devices ranges from 1 watt to 5 watts. Normal LEDs only receive about 0.05 watts. At this higher power, these devices can emit a lot of light. . . Circuit by David Johnson P.E.-August, 2008
High side PWM Motor/Light Controller - The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET. N Channel devices tend to handle more current than P Channel devices, they are also less expensive. The high side version of the circuit is useful when one side of the load has to be grounded __ Designed by G. Forrest Cook
High Speed NiCd Charger for Electric R/C - A few years back, I published a design for a Low Cost Thermal Peak Detection Charger. Since then, I've designed several other chargers, in my ongoing quest to avoid having to spend money. Of course, in building all these designs, I've probably spent more than a really good commercial charger would have cost me. But designing and building is half the fun __ Designed by Stefan Vorketter
High-frequency AGC has digital control - 05/21/98 Design Ideas(Multiple circuits listed, scroll to find this one) Many systems, especially communications, require AGC that functions at 50 MHz. Self-calibrating systems, such as automatic test equipment, need this high-frequency response but also require digital control of the AGC output voltage. During the calibration cycle, the test equipment calculates the AGC output voltage necessary to achieve the accuracy requirements and then increments the AGC output voltage until the system is within specifications. The AGC circuit in Figure 1 uses a DAC to accomplish the digital control, and because the DAC is the reference input of the AGC circuit, the DAC ultimately sets the AGC output voltage. Design by Ron Mancini, Harris Semiconductor, Melbourne, FL
High-Frequency VGA has Digital Control - 07/18/96 EDN-Design Ideas You can use variable-gain amplifiers (VGAs) in many types of systems, such as radio receivers, in which the input signal voltage depends on an uncontrolled variable, such as distance to the transmitter. In this type of system, you can use a VGA to ensure that the input signal amplitude matches the input voltage range of key components, such as ADCs and DACs, thereby maximizing the converters' dynamic range. Design by Ron Mancini, Harris Semiconductor, Melbourne, FL
High-Power Reversible DC Motor Speed Controller - This reversible DC motor speed controller uses a switchmode MOSFET bridge circuit that drives the motor. It can be controlled by a 1-2ms pulse train from a radio control system or by a single potentiometer to give forward/reverse throttle control. It can operate from 12V or 24V batteries at currents up to 20A with just four MOSFETs in the bridge circuit.__ SiliconChip
High-Power Reversible DC Motor Speed Controller - Here's a 12-32V 30A speed controller that's easy to build. It's available in two versions ? reversible and non-reversible ? and features soft start, relay switching of motor direction and PWM speed control.__ SiliconChip
High-Quality DAB+/FM Tuner, Pt.1 - We know you've been waiting for it and after more than a year in development, we are delighted to present this world-first high performance DAB+/FM stereo tuner design. It has all the bells and whistles of DAB+ in a sleek pro-quality case, with all features accessible by remote control.__ SiliconChip
High-Quality DAB+/FM Tuner, Pt.2 - Last month, we introduced our new DAB+/FM Stereo Tuner and gave the circuit details. This month, we show you how to assemble the two PC boards and install them into a low-profile steel case.__ SiliconChip
High-Quality DAB+/FM Tuner, Pt.3 - In this month's final part, we explain how to use the DAB+/FM Stereo Tuner and describe the menu system. We also show you how you can upgrade the firmware if necessary and describe various features of the tuner in detail.__ SiliconChip
High-Rate Electronic Speed Control with BEC & Brake - This electronic speed control (ESC) for brushed motors combines the features of two of my earlier designs. One was a high-rate 30A ESC with a brake, and the other a high-rate 12A ESC with a BEC (receiver battery eliminator circuit). __ Designed by Stefan Vorketter
High-Rate Speed Control with Brake - Many designs for high-rate speed controls have been published. Most require two 8-pin integrated circuits (ICs) or one 14-pin IC. Many designs suitable for home construction are fairly large (some as large as 2" square). Many do not include a brake __ Designed by Stefan Vorketter
HO Model Train Lighthouse Flasher - HO train sets often have authentic looking scale model homes and buildings. The hobby circuit below can be mounted inside a model lighthouse. The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotation . . . Hobby Circuit designed by David Johnson P.E.-July, 2006
HO Train Lighthouse Flasher Revisited - HO train sets often have authentic looking scale model homes and buildings. A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash. I designed a working circuit but I was never pleased with the results. I’m still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit. … [ . . . Hobby Circuit designed by Dave Johnson P. E. , May 2012] . . . Hobby Circuit designed by David Johnson P.E.-December, 2012
Home Appliances Control using Telephone - Using this circuit, you can control up to seven electrical appliances through a telephone. The circuit can switch on/off the appliances in two modes. In the first mode, all seven or...__ Electronics Projects for You
Home Built Laser Projector - Laser projector is one of the laser display equipments. This project builds the closed-loop galvos mainly and aiming at professional grade. __ Designed by The Electronic Lives Manufacturing-presented Chan
Homemade RF choke - Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU
Homemade Water Drain Pump controller - A hole needs to be digged at the lowest place in the celler that have water incoming problems. The hole is about 0.5 x 0.5 x 0.5 meter, at the bottom a large water pump is mounted. Then the different water levels was measured, so we know how to make the sensors. __ Designed by Thomas Scherrer OZ2CPU
Hot Swap Meets Infiniband Specification - DN265 Design Notes__ Linear Technology/Analog Devices
Hot Water Tank Level Indicator - The idea for this project may have come to me in a flash of inspiration, and its a very simple way to check if a fuse has blown without removing it from its holder __ Designed by Andy Collison
Hot-Swap Controller Handles Dual Polarity - 12/11/03 EDN-Design Ideas Some applications require a hot-swap controller, a circuit-breaker function, or both for dual-polarity, dc-input power-supply rails. In some hot-swap cases, the requirement is based only on inrush-current considerations. Control of Design by Dan Meeks, Texas Instruments, Manchester, NH
How to Build a 300MHz AM RF Remote Control SystE - M - 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
How to Make a PWM without a Microcontroller - Pulse-width modulation is a digital technique for varying the amount of power delivered to an electronic component. By adjusting the amount of power delivered to a motor or LED, the speed or brightness (respectively) can be controlled. __ Contact: David Cook
How to Make Chase Lights - This example shows3 track chase lights built from3-Christmas light sets and1-light chaser controller
How to record telephone conversations - Sometimes it is useful to record telephone conversations. The easiest way is to go to a shop and buy a telephone conversation recording adapter which is connected between telephone line and the tape recorder. Those recording adapters are usually connected between telephone line and the telephone, but there are also other type available __ Designed by Tomi Engdahl
Humidity Indicator & Controller - Presented here is a simple humidity indicator and controller. In industries such as textile, the change in moisture content has a direct impact on the properties of fabric, such as tensile...__ Electronics Projects for You
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