|
Simple Circuit 120 VAC Motor speed controller based on a TRIA - C - This circuit will allow you to control the speed of an AC motor, for example an electric drill. The way that this circuit works is as follows. The bridge rectifier produces dc voltage from the 120vac line. A portion on this current passes through the 10K ohm pot. The circuit comprised of the 10k pot, the two 100 ohm resistors and the 50uf capacitors delivers gate drive of the SCR. The diode D1 protects the circuit from reverse voltage spikes. The ratings of the bridge rectifier and the SCR should be 25 amps and PIV 600 volts. The diode D1 should be rated for 2 amps with PIV of 600 volts. The
Simple Circuit allows long PWM soft starts - 02/01/07 EDN-Design Ideas - Enhance timing accuracy of a switching regulator's start-up ramp Design by Robert N Buono, Aeolian Audio LLC, Bloomfield, NJ
Simple Circuit Bidirectional DC Motor Speed Controller - The LT1970 is a ±500mA power op amp with precise externally controlled current limiting. Separate control voltages program the sourcing and sinking current limit sense thresholds with 2% accuracy. Output current may be boosted by adding external power transistors. __ Linear Technology/Analog Devices App Note, Apr 5th 2010
Simple Circuit Bidirectional DC Motor Speed Controller Without a Tachometer - For motor speed control without using a tachometer, the circuit in Figure 12 shows an approach. Using the enable feature of the LT1970A, the drive to the motor can be removed periodically. With no drive applied, the spinning motor presents a back EMF voltage proportional to its rotational speed. The LT1782 is a tiny rail-to-rail __ Linear Technology/Analog Devices App Note, Dec 5th 2011
Simple Circuit Capacitance Multiplier Power Supply for Class-A Amplifiers - A basic circuit is provided in the article, but it is assumed that the builder knows all the pitfalls. The supplied schematic is in fact for a capacitance multiplier filter (not a regulator) , but is somewhat lacking (I feel) and can be improved dramatically __ Designed by Rod Elliott ESP
Simple Circuit controls stepper-motors - 01/08/04 EDN-Design Ideas - Stepper motors are useful in many consumer, industrial, and military applications. Some, such as personal-transportation systems, require precise speed control. Stepper-motor controllers Design by Noel McNamara, Analog Devices, Limerick, Ireland
Simple Circuit DC Adapter Power Supply - DC voltage "virtual earth" circuits __ Designed by Rod Elliott ESP
Simple Circuit DC Motor PWM speed control - You need a power supply for a project, but only have a DC adapter available, so you can't use my AC power adapter trick (Project 05) . This little project came about because a reader had just this problem, and didn't know what he could do. This idea will work best with DC adapters having 12V DC or more - lower voltages will work, but the dynamic range will not be as good as it could be __ Contact: IQ Technologies
Simple Circuit ESC - with optoisolated input
Simple Circuit Inverter - This circuit will provide a fairly stable "Square Wave" Output Voltage. Frequency of operation is Mainly determined by the 220 uF Feedback Caps. Currently about 60 Hz. Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec
Simple Circuit servo Controller - This cicuit allows you to test a servo. The angle of the servo can be set by means of the 10k potmeter. Perhaps you will not be able to reach all positions with this circuit. Playing with other
Simple Circuit Servo Controller using 555 Timer - Servo motors have many uses in everything from robotics to puppetry to photography and beyond. These little motors can position their output shaft to any position on command and hold that position. Most servos have a range of motion to about 210 degrees and thankfully are very easy to control with a simple circuit such as the one presented here. Using just a 555 timer and a few support components this circuit can control a servo through it's full rotation based on the position of a pot. This circuit was originally published in the Think Tank column of the October 1995 issue of Popular Electronics. __ Designed by Aaron Cake
Simple Circuit Smoothly Drives Stepper Motors - 05/28/09 EDN-Design Ideas - Adding an analog switch make the motor bidirectional - The circuit in This design idea drives low-power, unipolar stepper motors using only a shift register, a few resistors, and low-power transistors. Adding an inexpensive 4053 an Design by Uwe Schüler, Institute of Physiology, Tübingen, Germany
Simple Circuit stepper Motor controller - The circuit shown above can be used to control a unipolar stepper motor which has FOUR coils (I've swiped it off an old fax machine) . The above circuit can be for a motor current of up to about 500mA per winding with suitable heat sinks for the SL100. For higher currents power transistors like 2N3055 can be used as darlington pair along with SL100. The diodes are used to protect the transistor from transients. Activating sequence: [code:1:7492cb9d88]+-------------+---------------+ | Inputs |Coils Energised| |-------------+ | | D0 D1 |
Simple Circuit Stepper Motor Controller - The circuit shown above can be used to control a unipolar stepper motor which has FOUR coils (I’ve swiped it off an old fax machine) . The above circuit can be for a motor current of up to about 500mA per winding with suitable heat sinks for the SL100. For higher currents power transistors like 2N3055 can be used as darlington pair along with SL100. The diodes are used to protect the transistor from transients.
Simple Circuit stepper Motor Controller - This design allows for very precise control of the motor: by proper pulsing, it can be turned in very accurate steps of set degree increments (for example, two-degree increments, half-degree increments, etc.) . They are used in printers, disk drives, and other devices where precise positioning of the motor is necessary. There are two basic types of stepper motors, unipolar steppers and bipolar steppers
Simple Circuit stepper Motor driver for PC parallel port - A stepper motor has four coils. The direction of rotation (clockwise or anti-clockwise) depends on the order in which the currents supplied to the coils are switched on. If you use the motors type 55SI-25 DAYA, having a connector as shown below, __ Designed by © David Hoult
Simple Circuit switching power supply - ...could a switcher be designed that would use parts available from ANY Radio Shack or well-stocked junk box? I'm happy to report the answer is YES! __ Designed by Donald L Burdette
Simple Circuit switching power supply (mains operated) - A Versatile and useful supply to Experiment with, Good for the Beginner to learn. This is Direct 110 VAC input. __ Designed by G.L. Chemelec
Simple Circuit switching regulator (experimental) - This is an experimental circuit which rapidly "chops" a steady DC input voltage to produce a lower output voltage. Regulation is a function of the chopping - It is caused by the output transistor switching on and off around the target voltage, which when smoothed provides a constant DC output.__ Rowan from Melbourne, Australia
Simple Circuit temperature regulated FAN speed Controller - This regulator uses a P-FET to change the positive supply voltage to a FAN an NTC resistor mounted on the device that needs cooling will change the fan speed, the temperature on the heat sink will therefore be constant, while the FAN speed will change, depending on power disipated The RPM output signal from most FAN types will continue to function,
Simple Circuit temperature regulated FAN speed controller - This regulator uses a P-FET to change the positive supply voltage to a FAN an NTC resistor mounted on the device that needs cooling will change the fan speed, the temperature on the heat sink will therefore be constant, while the FAN speed will change, depending on power disipated __ Designed by OZ2CPU Thomas Denmark
Simple Circuit Two Speed Contactor DC Motor Controller - The simplest of all motor controllers (besides a straight on/off switch) is the contactor controller. Aaron designed this contactor controller for use in his __ Designed by Aaron Cake
Simple Constant Current Source - This simple constant current source uses an LM317 regulator IC. N. B. The pin-outs of the IC are not a mistake, the output is taken from the adjustment pin. I found this circuit to charge all my NiCad batteries, and I use a Kambrook mechanical light-timer (or equiv.) for 110vac to time the charge __ Designed by John Nooyen
Simplified DC Motor Torque Control-LT6108 - The LT6108 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and a comparator. Two versions of the LT6108 are available. The LT6108-1 has a latching comparator and the LT6108-2 has a non-latching comparator. In addition, the current sense amplifier__ Linear Technology/Analog Devices App Note, Sep 7th 2011
Simplified DC Motor Torque Control-LT6109 - The LT6109 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and two comparators. Two versions of the LT6109 are available. The LT6109-1 has the comparators connected in opposing polarity and the LT6109-2 has the comparators connected in the same__ Linear Technology/Analog Devices App Note, Sep 7th 2011
Single Control Switch for Fan & A - C - Here is an electronic switch that can be used to switch on both the air-conditioner as well as fan of your room, one by one. The circuit consists of power supply and...__ Electronics Projects for You
Single to 3-phase power conversion - The single phase 220 VAC input is brought in on lines 1 and 2, labeled L1 and L2 in figure 1. Time delay cartridge fuses are used for short circuit protection.1R-1 and 1R-2 are the main contacts for the magnetic contactor (power relay.) The coil for this relay is denoted 1R. The run capacitors are wired between lines 1-3 and lines 2-3. The overloads are part of a thermal overload relay with a normally closed contact labeled OL-1. This contact will open if any overload is tripped. Opening this contact disables the flow of current through the 120 VAC control circuit deenergizing the coil 1R. The idler motor terminals are labeled T1, T2, and T3 __ Designed by John - K3PGP
Six-transistor H-bridge - This is the six transistor "Tilden style" H-bridge; while not as old as the original "basic H-bridge, " this goes "way back, " and is the basis for many BEAM driver circuits __ Designed by Wilf Rigter
Smart Continuity Tester - Occasionally you need a continuity test between two points in an electronic circuit. Unfortunately, most continuity testers are prone to "lie". They don't do that deliberately, but if they see a small resistance, they still tell you that you have continuity. They just don't know any better __ Designed by Tony van Roon VA3AVR
Smooth, fast, strong & cheap stepper Motor controller using a PIC micro - The Linistepper is a well reviewed, open source controller / driver for small to medium sized 5, 6 or 8 wire unipolar (not 4 wire bi-polar) stepper motors. The Linistepper combines ultra smooth, low noise, old school linear microstepping with modern active current regulation for faster response. __ Designed by Seiichi Inoue
Smoothly Drive Stepper Motors - 05/28/09 EDN-Design Ideas - Adding an analog switch make the motor bidirectional - The circuit in This design idea drives low-power, unipolar stepper motors using only a shift register, a few resistors, and low-power transistors. Adding an inexpensive 4053 an Design by Uwe Schuler
Soft-Start Module - Simple circuit that reduces surge current on start of an induction motor. __ Designed by Wichit Sirichote
Solar Engine that is MicroPower - Voltage-Controlled Solar Engine: Ken Huntington's fairly complex, but very efficient "micropower" solar engine design. No 1381s or ICs needed. __ Designed by Ken Huntington
Solar-Array Controller Needs No Multiplier to Maximize Power - 12/05/08 EDN-Design Ideas - Relying on the logarithmic behavior of transistor junctions to calculate power, this controller operates a photovoltaic array at its maximum power point Design by W Stephen Woodward, Chapel Hill, NC
SolarbotICs NV-Based - uses a single IC (and it's a common one, too -the 74AC240) to give you motor drive in a single direction
__ Designed by Wilf Rigter
Solar-powered Motor runs on 10 nA - 18-Mar-04 EDN-Design Ideas - Designs for solar-powered applications with low-duty-cycle requirements can often rely on capacitors for energy storage in place of less reliable batteries. Typical applications include solar positioning, telemetry transmitters, chemical pumps, data loggers, and solar-powered toys. The circuit in Figure 1 can run a small pager motor from the output of a small calculator-type solar cell in near Design by Stepan Novotill, Victoria, BC, Canada
Solar-Powered Pump Motor Controller - A Discover Circuits visitor had a problem. He needed a simple on/off controller for his solar powered water pump. His system used two 12v 50 watt solar panels wired in series. The power from the solar panels drove a submerged water pump. However, during. . . Circuit by David Johnson P.E.-October, 2010
Solid State Relay - Solid State Relays are available almost everywhere these days, however they remain very expensive. Therefore, your efforts to build one yourself pays off. Especially since it only needs a handful components and the circuitry is simple and straightforward __ Designed by Jan Hamer
Solid State Reversing - This circuit uses solid state switching (transistors) to control direction of a DC motor. You have precise control of the movement of the motor, and an indication of direction provided by LED's. __ Designed by Andy Collison
Solid State Tesla Coil/High Voltage Generator - This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although I have never tried) , demonstrate St. Elmo's fire, and even cause a fluorescent bulb to light from as much as 2 feet away. __ Designed by Aaron Cake
SOT-23 Smbus Fan Speed Controller Extends Battery Life & Reduces Noise - DN238 Design Notes__ Linear Technology/Analog Devices
Speed Control Of DC Motor using Pulse-Width Modulation - Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage of digital ‘high’ to digital ‘low’ plus...__ Electronics Projects for You
Speed Controller for DC Motor - Here is a simple circuit to control the speed of a DC motor. It can be configured to control the sweep rate of automobiles’ windscreen wiper. The circuit comprises a timer NE555...__ Electronics Projects for You
Speed Controller for Robot - The purpose of a motor speed controller is to take a signal representing the demanded speed, and to drive a motor at that speed. The controller may or may not actually measure the speed of the motor. If it does, it is called a Feedback Speed Controller or Closed Loop Speed Controller, if not it is called an Open Loop Speed Controller. Feedback speed control is better, but more complicated, and may not be required for a simple robot design __ Designed by Paul Hill
Speed Controller for Small Cooling Fans - Small cooling fans are used in some equipment for cooling semiconductor devices. The circuit given here is of a simple automatic speed controller for a 12V, 0.6W (or 1.2W) cooling fan...__ Electronics Projects for You |
