Square Wave Driver Has Flexible Outputs  -  This circuit can produce an output signal ranging from DC to 100KHz. It can source a voltage ranging from 1v to 30v. It can sink a voltage ranging from zero volts to –30v. It can drive up to 200ma of current and can even be switched to a floating tristate . . . [Circuit by David Johnson P.E.,  07/08/00]

SSR Requires Ultra Low Control Current  -  Most solid state relays require at least 5ma and often more input control current, to fully turn on the device. But such current levels often force battery powered circuits to use excessively large batteries. The relay hobby circuit shown below demands only 50uA of input current . . . [Hobby Circuit designed by David A. Johnson P.E.,  06/03/00]

Stall Motor Switch Machine Circuits information  -  The circuits on this page are basic designs for "Diode Matrix" switch machine control systems that can be used to operate "Stall-Motor" switch machines in 'Ladder' type storage yards or other multiple turnout areas. The driver circuits themselves use LM556 dual timer chips to reverse the polarity of the voltage to the switch machine motors. . . .  [from Rob Paisley's Model Train web site]

Stealth-mode LED controls itself  -  05/25/06  EDN Design Idea    High-efficiency LED doubles as a light detector- Since the LED’s invention more than 30 years ago, its emission efficiency has steadily increased, and, although it may surprise you, the increased conversion efficiency works. . .  [by Howard Myers, Greensboro, NC]

Stepper Motor Controller  -  The direction of rotation is determined by the FORWARD and REVERSE switches and the motor does not take any current when a switch is not pressed. . . .   

Stepper Motor Controller  -  . . .  [Circuit designed by Aaron Cake]

Stepper Motor controller  -  On these pages, I will introduce a control circuit for stepper motor. The software of this project is adapted to Embedded Systems (Lab13) for 2002 of Cleveland State University. PIC16F84A. . .  [Seiichi Inoue's Web Site]

Stepper Motor Controller Connection Diagrams  -  Four-Wire Connection The ULN2003 / MC1413 is a 7-bit 50V 500mA TTL-input NPN darlington driver. This is more than adequate to control a four phase unipolar stepper motor such as the KP4M4-001. . . .   

Stepper Motor Drive  -  STMicroelectronics-Application. . .   

Stepper Motor Driver  -  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, . . .  [© David Hoult 2013]

Stepper Motor Driver (74194)-Unipolar  -  This circuit is based on the UNIPOLAR stepper motor. The main feature of this circuit is low power consumption in the motor circuit. This is achieved by only turning on the individual outputs of the driver for 1/10th of a second for each step the motor makes. . .  [from Rob Paisley's Model Train web site]

Stepper Motor Driver using TEA3718/3717  -  The stepper motor driver circuit is using a pair of TEA3718/3717 to drive the stepper motor in bipolar chopper configuration. The U3 555 timer provides the clock pulse. The U1 and U2 form a two-direction TTL full step generator. If only one direction is needed then the circuit below can be used. . .  [www.wzmicro.com]

Stereo Line Driver  -  Power Amp Stereo Line Driver, This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive screened cables. The very low output. . .  [Andy Collison's website]

Super Bright 3v Powered LED Flasher  -  I have posted several kinds of LED flashers over the years.  This is yet one more flasher, designed to flash any high power LED of any color. It hits the LED with a 25ms 250ma pulse once every 2 seconds.  This works out to an average current about 3ma. It . . . [Circuit by Dave Johnson P.E.,  04/22/09]

Switched Cap Circuits Provide Efficient and Functional White LED Drive (Rev. B)  -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs. LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors. LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost. . . .  [Texas Instruments App Notes, 30-Apr-13]

Switched Capacitor Circuits Provide Efficient and Functional White-LED Drive  -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs. LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors. LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost. . . .  [Texas Instruments App Notes, 6-Mar-03]

Switches AC or DC power using a Latching Relay  -  The circuit below switches AC or DC power to a load using an ultra low power 3v latching relay with two coils. The relay can handle about 10 Amps of current, up to 250vac. Each time the small pushbutton is pressed, the circuit either latches the relay . . . [Hobby Circuit designed by David Johnson P.E.,  12/24/09]

Switching regulator drives robot motor  -  05/13/99 EDN Design Idea   The circuit in Figure 1 shows an example of how you can use an integrated switching regulator (ISR] to efficiently vary the speed of a permanent-magnet dc motor. In this application, the rotating head of a robot senses the presence. . .  [by Donald Comiskey, Power Trends Inc, Warrenville, IL]

Switching regulator efficiently controls white-LED current  -  04/27/06 EDN Design Idea   Circuit has 93% efficiency and beats 64% efficiency of series resistor approach. . .  [by Clayton Grantham]

Switching solenoid Driver  -  The circuit, in production, proved to be very reliable. Clearly you need to watch voltage spikes and current ratings. You should also not try to operate it at low voltages, say less that the solenoid voltage plus 15v, as the MOSFET goes into linear mode. This is not immediately damaging to the MOSFET, but it can get hot. For this reason, it is probably best not to switch the relay by connecting and disconnecting the power, but by activating and deactivating the controller. Methods of doing this could be added later. . . .  [Page's Author: Richard Torrens]

Synchronous Buck/Boost High Power White LED Driver  -   LT3453. . .  [Linear Technology]

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