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Night-Light Uses a Photoresistor to Detect Dusk - 12/15/11Design Ideas: You can adjust this battery-powered circuit for different levels. Design by Chau Tran, Analog Devices, Malden, MA
No Hassel 3rd Brake Light - This circuit is NOT a pulser or flasher! What's so special about this circuit? Well, the first third-brake light I installed I had to pull a wire from the Third Brake Light all the way underneath the carpet to the brake-pedal-switch and I thought it would be easier to pluck the signal of both brakelights via the trunk. Bench-test your circuit first and apply power to the circuit, __ Designed by Tony van Roon VA3AVR
Nocturnal Animals Whisker - A low-rate flashing lamp drives away undesired visitors; Automatic on-off operation __ Contact: Flavio Dellepiane, fladello @ tin.it
Nocturnal--solar engine - Nocturnal -- These solar engines charge up when it's light, and discharge (i. e. , power a load) when it's dark. Nocturnal solar engine designs are built for just one thing -- to provide power to a nighttime load. This means that unlike other SE designs, they charge continuously when there's light, then only release their power when it's dark -- essential behavior for BEAMbots that you only want to be active at night -- "crickets", night-lights, "pummers", and other such ornaments. __ Contact: Eric Seale
No-Hum Fan Controller - Control is derived from the output of regular wall switch. The signal is filtered to obtain the dimming level as a low level analog voltage by C3 and its associated components. The LM3914 chip selects one of its outputs depending on the amplitude of the voltage, which turns on one of the LEDs to indicate the speed, and turns on one of the Solid State Relays to control the fan speed. The LEDs allow a handy display of the speed. The top LED (green) shows full power to the fan __ Designed by Ed Cheung
Nokia 7650 LCD Controller - Despite nobody seems to own the appropriate documentation, it is possible to use the big cheap color LCD displays of the Nokia series 60 cell phones for home brew projects. I don't even have the docs and it was a rough and painful way, but now it works
Non-Dimmable Fluorescent Ballast - Efficient fluorescent lamps and magnetic ballasts have been the standard lighting fixture in commercial and industrial lighting for many years. Several lamp types, rapid start, high output, and others are available for cost effective and special applications. This user guide covers operation and development details of the non-dimmable version of our fluorescent ballast for operating a variety of lamps that are available today. __ Designed by AT89RFD-10 / EVLB002
Notch Filter Autotunes for Audio Applications - 24-Jun-10 EDN-Design Ideas Tracking notch filters find use in harmonic-distortion analyzers; they also can remove heterodyne noise from ham-radio systems. A conventional tracking switched-capacitor notch filter relies on a bandpass filter, a voltage-to-frequency converter, and a notch filter to track the incoming signal and remove undesired tones. The bandpass filter in these circuits sometimes adjusts to the wrong frequency, meaning that the undesired tone would have no attenuation Design by John R Ambrose, Mixed Signal Integration, San Jose, CA
Notoof Remote Telemetry Device! - This PIC project permits five analogue signals to be acquired (to ten bits resolution) and transmitted to a remote computer. As well as a conventional serial output, the PIC generates an FSK signal that can be conveyed through almost any audio channel. The FSK output is used in this project to illustrate data transfer using an FM transmitter. __ Contact: Karen's Microprocessor Projects
Novel controls AC power - 01/07/99 EDN-Design Ideas (Several Circuits in File. Scroll to find this one) The simple and inexpensive power-control circuit in Figure 1 uses a readily available fan regulator with built-in phase control. Such fan regulators are limited to approximately 100W. The circuit in Figure 1 adds two SCRs and a few components Page includes
several designs. Design by Narendra Paranjape, Tata Chemicals Ltd, Mithapur, India
Nu-based stepper Motor drive - A nifty (single-IC!) circuit to drive the bipolar stepper motor that's a part of floppy drives: __ Designed by Wilf Rigter
NuStepper - Uses just a single IC ('though not one you're likely to have in your "parts box") to give you reversible motor drive __ Designed by Wilf Rigter
Oatley DC Motor Windmill - Based on a 300watt 24v DC scoota motor, this little windmill would work well if I could boost the output voltage.
Old idea, new twist-Magic Lamp - You have probably seen "magic lamp" circuits in which an ordinary incandescent bulb is lit by a match. These circuits rely on a hidden temperature or light sensor and are not particularly interesting. I decided to make a magic lamp, __ Contact: Charles Wenzel of Wenzel Associates, Inc.
On and Off Programmable Controller for 3-Phase 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
On/Off Motor Control with Brake - Modern electronic speed controllers (ESCs) are very efficient, but they still have some drawbacks. An inexpensive ESC with two IRFZ40 MOSFETs has an on-resistance of 14 milliOhm. At 20A current, this means a voltage drop of 0.28V, and a power loss of 5.6W. Furthermore, to build an ESC with a brake generally requires an expensive P-channel MOSFET __ Designed by Stefan Vorketter
On/Off Motor Controller with Brake - The circuit for the controller begins with a buffer, consisting of R1, R2, R3, and Z1A, which isolates the receiver from the rest of the circuit and makes operation of the circuit independent of the exact signal levels from the receiver. __ Designed by Stefan Vorketter
One Cell Flashes White LED - 12/11/03 EDN-Design Ideas Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages. It is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5V. The ability Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK
One component drives stepper Motor - The extremely simple circuit in Fig 1 drives a stepper motor directly from 12V ac , 60 Hz power supply. Usually you need switched-dc voltages to drive a stepper motor. But a stepper motor will run off ac lines if you introduce a 90° phase shift between the voltages applied to the motor's two windings. In this case only one 6.8uF non polarity capacitor is needed. __ Contact: info @ wzmicro.com
One FET controls LED array - 04/12/01 EDN-Design Ideas White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL (cold-cathode-fluorescent-lamp] and EL (electroluminescent] technology. As a result, white-LED backlights are increasingly common in PDAs (personal digital assistants], cell phones, digital cameras, and other portable devices. A design Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA
One processor pin controls on/off function - 04/29/04 EDN-Design Ideas A recent Design Ideasprompted me to offer the simpler solution that I used in a recent project (Reference 1]. We needed a momentary power switch with processor supervision. This supervision would allow the processor to delay a powe Design by Michael Sirkis, Radio Systems, Logan Township, NJ
One switch controls digital potentiometer - 09/19/02 EDN-Design Ideas This design idea is an evolution and simplification of another (Figure 1, Reference 1]. Replacing the three inverted-input NOR gates with their logical equivalents, positive-input NAND gates, makes these three gate symbols consistent Design by Jim Bach, Delphi Delco Electronics Systems, Kokomo, IN
One Wire Barometer - OWW is an application for Linux and RISC OS
to drive the 1-wire weather station. . . . Designed by Simon
Melhuish
One wire brings power & data to LCD Module - 01/27/14EDN-Design Ideas If you need to connect a small remote LCD display, or your µC has run out of I/O pins, here’s a good, cheap solutionEmbedded systems frequently use HD44780type LCD displays as it is considered the most popular alphanumeric display controller. The interface comprises at least 14 pins: eight for data, three for control (EN, WR, RS), two for power supply (Vdd, Vss), and one for contrast (Vre). Configured in 8bit mode, it requires at least 10 I/O lines (D0D7, EN, RS). Configured in 4bit mode, it requires at least six I/O lines (D4D7, EN, RS) Design by Benabadji Noureddine
One wire controls LCD Module - EDN-Design Ideas 03/20/2017 This one-wire LCD interface DI generates all the signals required to control the ubiquitous character display Design by Rex Niven
One-Watt White LED Night Light - As many of you know, I have a pet peeve with poorly made LED night lights. Often, the light from the LED quickly fades, so within months, the light is useless. I have posted several versions of modified night lights using higher quality components. This circuit is yet another version, which produces much more light than those other designs. . . . Hobby Circuit designed by David A. Johnson P.E.-November, 2008
One-Wire Network Controls Remote SPI Peripherals - 09/04/08 EDN-Design Ideas This circuit controls a remote LED display by the 1-wire network through an SPI-compatible display controller Design by Michael Petersen, Maxim Integrated Products, Colorado Springs, CO
One-Wire Relay Control - schematic only, no circuit description included __ Designed by Simon Atkin
One-Wire Satellite Position Controller - After finally completing the 1-wire hub project I had time to build a mount for my Triax prime focus satellite dish. I had also earlier bought two 18" Geotrack Dish Actuators and now needed a method of controlling them remotely from a computer. So I had the bright idea of using 1-wire devices to control the process of switching the motor supplies and counting the pulses from the actuator sensor __ Designed by Simon Atkin
On-Off Temperature Control - This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polarization regime. In fact when forward biased, the forward voltage drop accross a diode has a temperature dependance, in particular has a negative linear(ish) slope __ Contact: Jonathan Filippi
Op Amp based PID Controller with SPICE simulation - We've all heard about the wonders of the PID controller, bringing a system's outputtemperature, velocity, lightto its desired set point quickly and accurately. But now, your boss says okay, design one for us. Although there's a number of ways to do it, the circuit above nicely separates the three terms into three individual op amp circuits.
Open-loop power supply Delivers as much as 1W - 01/18/01 EDN-Design Ideas For VCRs, TVs, and other equipment that requires a standby mode, you must supply power to a µP when other components are asleep to receive and interpret any wake-up signal from the remote control or from the broadcasting company. These types Design by Christophe Basso, On Semiconductor, Toulouse, Cedex, France
Operates at voltages as high as 540V ac - 08/26/10 EDN-Design Ideas Reducing dc bus voltage reduces costs and lets you use standard dc power circuits. Design by Vipin Bothra and John Lo Giudice, STMicroelectronics
Optical Filter using Color Film Negative - This isn’t an electronic circuit but the file shows the curve for an optical filter made from exposed color film. The material blocks most visible light but is very transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool white" fluorescent light for about 5 seconds . . . Hobby Circuit designed by David A. Johnson P.E.-January, 1998
Optical Remote On/Off Switch - First published on: 1-10-2006 Using this optical remote control, you can switch on/off any electrical or electronic load. Like any remote control system, it has a mini transmitter unit (Fig.1) and...__ Electronics Projects for You
Optically isolated stepper Motor controller - These are some very high-level instructions for building the Opto-Isolated Stepper Motor Controller. Not really a lot to say. Most of the construction is self-explanatory using the PCB artwork, the overlay, and the schematic. Note that the pad for pin 1 on ICs and such are square to help in proper placement. All ICs on the board are NOT oriented the same way, so pay attention. __ Contact: wrb @ cbnews . att.com
Optically isolated TRIAC driver - One simple way of isolating the two parts of the circuit is shown below. If a high intensity red led is used in the circuit below, the TRIAC can be switched using a current as low as ½mA. This means that the circuit can be connected directly to the output of an op. amp. or even a CMOS
logic chip. __ Designed by © David Hoult
Optoelectronic position control simplifies Motor Movements - 29-Apr-04 EDN-Design Ideas The optoelectronic technique for achieving position control provIdeas an inexpensive, easy- to-design method of achieving simple, repeatable movement using fixed index points with linear- or rotary-motion components. The simple, basic design in Figure 1 for sequential position control exploits the quick response time of a power op amp, working in tandem with a pair of photodiodes Design by Marie Rivera, Apex Microtechnology Corp, Tucson, AZ
Opto-Isolated logic level trigger for general strobe applications - Schematic only, no circuit description.
Ornamental Flashing LEDs - This circuit can flash three sets of LEDs with different levels of Flashing. It can be used as Ornamental displays. The circuit uses a simple Astable multivibrator built around the popular timer IC NE555. Resistors R1, R2 and capacitor C1 determines the output frequency. When the output becomes high, Red LEDs lights first. When __ Designed by D Mohankumar
Oscillator/Reference Oven Temperature Regulation - The LTC2990 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting __ Linear Technology/Analog Devices App Note, Mar 16th 2011
OTP µC controls Boomer Amplifier - 03/18/99 EDN-Design Ideas NOTE
: Page includes
several designs. Scroll to find this one. Figure 1 shows a circuit that uses a one-time-programmable (OTP) µC in an unusual way. A COP8SGR7 µC uses digital signals to "bit-bang" an LM4835 (dubbed "Boomer" by National) amplifier. Although the amplifier is designed for potentiometer control, you can modify it to make it a fully digitally controlled part. Figure 2 shows the flow chart for the control process. Design by Wallace Ly, National Semiconductor Corp, Santa Clara, CA
Outdoor Lighting Controller - When you step out of your brightly-lit house into the darkness, it takes a while for your vision to adjust. A solution to this problem is this outdoor light with automatic switch-off. As a bonus, it will also make it a little bit easier to find the keyhole when returning late at nightmust register on this site __ Designed by Published in Elecktor July/Aug, 2010
Over-Temperature Micro-Power Alarm - The circuit is powered for years by a single 3 volt lithium battery. It sounds an alarm when the temperature exceeds a certain point. With some minor changes the circuit could also be configured for an under temperature (freeze) alarm. The circuit uses a . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Overvoltage Regulator with 250V Surge Protection - The LT4363 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in vehicles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value allowing the loads to continue functioning. The LT4363 also monitors the voltage__ Linear Technology/Analog Devices App Note, Jan 16th 2012
Overvoltage Regulator with Low Battery Detection & Output Keep Alive During Shutdown - The LT4356 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356 also monitors__ Linear Technology/Analog Devices App Note, Apr 26th 2010
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