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1.5kW Induction Motor Speed Controller, Pt.2 - Last month, we described the features of the 1.5kW Induction Motor Speed Controller and explained in detail how it works. This month we describe its construction and testing and give some guidelines for use.__ SiliconChip
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
10A Universal Motor Speed Controller, Mk.2 - This latest speed controller can be used with power tools and appliances rated up to 10A. It is suitable for use with brush-type universal motors such as those in small lathes, electric drills, grass trimmers, circular saws, routers, nibblers and jigsaws.__ SiliconChip
12 Volt 10 Amp Dark Activated Switch (kit available) - The DAS1 is a combination manual switch and automatic dark-activated switch. It is designed to control up to 10 amps of 12V lights. A pair of high-intensity white LEDs are included in the circuit for built-in lighting. The circuit includes a low voltage disconnect circuit that prevents excessive battery discharge on battery operated systems. The DAS1 is ideal for solar powered lighting systems, it can also be used for line powered and automotive/marine applications. External 12V lights consisting of white LEDs, incandescent lamps and/or fluorescent lamps can be driven by the DAS1. __ Designed by G. Forrest Cook
12 Volt Differential Temperature Controller - for hot water and hot air system control __ Designed by G. Forrest Cook
12 volt Inverter-Very Basic type - 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
12v Brush Motor Speed Controller - In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed. In other applications, the average current to the motor needs to be limited, so the . . . Hobby Circuit designed by Dave Johnson P.E.-May, 2007
12v Cooling Fan Thermostat - This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level. Both the high and low temperatures are both adjustable. . . Circuit by David Johnson P.E.-February, 2011
12v DC Motor with Logic Controlled Automatic Brake - There are times when you would like to control a DC motor using a simple +5v logic swing signal. The circuit below performs this feat and also includes an automatic motor braking circuit. When the input logic signal swings from 0v to +5v, the n-channel . . . Hobby Circuit designed by David Johnson P.E.-February, 2010
12V 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
12V-24V High-Current Motor Speed Controller - Last month, we described the circuit and software features of our new High-Current DC Motor Speed Controller. This month, we show you how to build and test it.__ SiliconChip
2 Components Drive Stepper Motor - EDN-Design Ideas - 01/19/95 The extremely simple circuit in Fig 1 drives a stepper motor directly from 120V ac, 60 Hz. 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. Design by Carl Spearow, Basler Electric,m Highland, IL
2 Pushbutton Motor Controller - Two small pushbutton switches, a few diodes and two relays form a method to control on/off power to a brush motor as well as the motor direction. The circuit was originally designed for a motorized lifting platform . . . Hobby Circuit designed by David Johnson P.E.-September, 2005
20A12/24V DC Motor Speed Controller Mk.2 - This gutsy little speed controller has a wide range of applications and is simple to build and use. There are no software settings to fiddle with but it does have some really useful features such as low-battery protection, soft start and adjustable pulse frequency. It can run from 12V or 24V batteries at currents up to 20A.__ SiliconChip
230 Volt AC Motor Controller - Controls speed of230-Volt AC universal motor, in PDF format, text in Finnish __ Designed by spelektroniikka
230VAC 10A Full-Wave Motor Speed Controller - This full-range Motor Speed Controller will give smooth control from near zero to full speed on electric drills, routers, circular saws, lawn edgers, food mixers - In fact, any appliances with universal (brush-type) motors.__ SiliconChip
3-Phase Motor Driver Prevents Stall - 01/05/95 EDN-Design Ideas - The circuit in Fig 1 drives a small 24V, 50-Hz motor at about 30 to 40 Hz for use as a chopper motor. The best starting speed for the motor is about half the final running speed. Therefore, the circuit uses an intermediate speed to prevent a stall condition. The circuit uses IC1Ato count down two cycles after the selection of the intermediate speed. IC1B's Johnson divide-by-three counter and IC2's gates generate the 1208 phase angle Design by PM Kirkby, Crumpsall Electronics, Surrey, England
42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current - 11/26/13 EDN-Design Notes Measure inductance & capacitance over a wide range. The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications. To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation. The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output. Design by Hua Walker Bai
4-transistor H-bridge - An interesting 4-transistor H-bridge variant; this is cheap and easy to build, and best of all is "smokeless" (i. e. , no combination of inputs can cause the bridge to self-destruct) . __ Designed by Steve Bolt
555 Pulse Width Modulator - This circuit is capable of regulating 12V motors and DC light bulbs. No coolrib required for Q1 or D3 if the current does not exceed 2A. If it does, a sufficient coolrib for both the Schottky Diode (D3) and MOSFET Q1 is required __ Designed by Tony van Roon VA3AVR
555 stepper pulse generator - The 555 Stepper Pulse Generator kit will help you with the pulse required to drive your favorite stepper Motor driver. This kit uses the populer 555 timer IC for generating the Stepping Pulse. it has two range low frequency and high frequency __ Designed by © 2008, Leiterplatten Zubehör und Reflow-Kit Beta LAYOUT
555 Timer Forms Simple Circuit PWM Motor Controller - Using a CMOS
version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor. . . Circuit by David Johnson P.E.-February, 2007
555-based solar engine - Time-Controlled Solar Engine: a solar engine design using a 555 timer IC __ Designed by Wilf Rigter
65V 500mA step-down converter fits automotive & industrial applications - 05/31/14 EDN-Design Ideas - This switcher is happy to drop a 60V input all the way down to 0.8V. The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors, and other electronic devices throughout. The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages for motors and solenoids while the microcontrollers and other electronics require much lower voltages. As a result, there is a clear need for compact, high efficiency step-down converters that can produce very low voltages from the high input voltages Design by LTC Design Note
68HC11 Read Encoder - The encoder is connected to PORTA PA0 and PA1 -- The board must be in BOOTSTRAB MODE (tested with Loggyboard) __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik
68HC11 stepper Motor control - 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
68HC11 Synthesizes Accurate Sine Wave - 09/02/96 EDN-Design Ideas - You can use a 68HC11 and a 12-bit serial DAC (Figure 1) to generate accurate sine waves without using floating-point arithmetic. Figure 2 shows a block diagram for this sine-wave generator. You can easily analyze the generator's behavior by writing state equations in the z domain. You can also write equations in the
domain. The location of the two poles Design by Mika Maaspuro, Espoo, Finland
6-transistor H-bridge - This issix transistor "Tilden style" H-bridge; while not as old asoriginal "basic H-bridge, " this goes "way back, " and is basis for many BEAM driver circuits __ Contact: Bruce Robinson
74*245-based Motor driver - A simple, time-honored approach is to use one or more 74*245 chips (normally74AC245 is used for maximum current capability) to provide motor drive current. Here, each channel of drive power is provided by one or more buffer onchip. __ Designed by Wilf Rigter
76 MHz Hallogene Lamp Radio-Controlled - This circuit is a 73 MHz Hallogene Lamp Radio-Controlled. The purpose of it is to control the power state of a hallogene lamp by a remote control. When we press the push botton of the remonte control, the power state of the lamp will be changed, so, if the lamp was turned on, it will turned off and if it was turned on, it will turned off. If we press to the button another time, the same action will be occured. When the button is pressed, a LED indicator lights on the remote control __ Designed by Serge Saati
80C31 Stepper Motor Controller - The MD4 is a stepper motor driver design utilizing the 80C31 microcontroller. The design is very similar to the MD-2 stepper motor driver board except that this board has an on-board +5V regulator so it does not require a dual voltage power supply to run. It uses two Allegro UDN2540B ICs to driver the stepper motors. The U1 is 8031AH microcontroller which can be replaced with any 80C32, 87C51, 87C52 or flash base microcontroller 89C51, 89C52 families. __ Designed by www.wzmicro.com
9 Volt Stabilized Power Supply - Schematic only __ Designed by Tony van Roon VA3AVR
9-Volt Battery Eliminator - for guitar pedals, radios etc __ Designed by G. Forrest Cook |
