Safety Light  -  My 1200 square foot metal shop only has one small entrance door and no skylights. If the lights are turn off while inside, there is not enough light to safely find the door to exit the building. On a couple occasions, while I was quietly working at my test bench, my wife would walk into the shop, grab a garden tool and rush back out, turning off the lights and closing the door without thinking . . . [Hobby Circuit designed by Dave Johnson P.E.,  11/29/04]

Scheme provides high-side current-sensing for white-LED drivers  -  02/19/04  EDN Design Idea   White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as cellular phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To . . .  [by Dimitry Goder, Sipex Corp, San Jose, CA]

Senses & displays ambient light intensity  -  11/09/06 EDN Design Idea   LED doubles as photosensor and visual indicator of ambient-light intensity. In addition to their customary roles as indicators and illuminators, modern LEDs can also serve as photovoltaic detectors (reference 1 and reference 2). Simply connecting a red LED to a multimeter and illuminating the LED with a source of bright light, such as a similar red LED, produce a reading of more than 1. 4V (Figure 1). One model for a reverse-biased LED comprises a charged capacitor that connects in parallel with a light-dependent current source (Reference 1). Increasing the incident light increases the current source and more rapidly discharges the equivalent capacitor to the supply voltage. . .  [by Dhananjay V Gadre and Sheetal Vashist, ECE Division, Netaji Subhas Institute of Technology, New Delhi, India]

Sensor Electronic Tracker with H-Bridge Drive  -  I decided to make a commercial surface mount PC board using the LED2 sensor concept. It is quite sensitive and can track to a few degrees of accuracy in bright sunlight. If a blocking shadowis used the accuracy is better then 1/4 degree, that's about as good as you can get with an active feedback sensor. The board is a tiny. 7"x1. 4". . .  [The site is owned by Duane C. Johnson]

Sequential Turn Lights Driver  -  Four-LED left and right sequence; Particularly suited to motorcycles. . .  [Flavio Dellepiane's web site]

Serial Comms to LED Driver  -  . . .  [by Airborn Electronics, Australia]

Serial Interface & bias supply for Seiko-Epson G1206B dot graphics display  -  A serial interface and bias supply for the Seiko-Epson G1216N000 using an AT90S2313 because there just aren't enough applications examples for this display on the web. . . .  [From Dick Cappels' project pages]

Serial Interface for Truly MTC-C162DPLY-2N, 2 line X 16 char LCD display  -  A serial interface and bias supply for the Seiko-Epson G1216N000 using an AT90S2313 because there just aren't enough applications examples for this display on the web. . . .  [From Dick Cappels' project pages]

Series Connected Voltage Boost Circuit for a Battery Operated LED Lantern  -  A circuit that goes in series with a white LED and a 1.5volt cell to make > 3 Volts to drive a white LED. . .  [From Dick Cappels' project pages]

Series White LED Driver   -  Application Note LM3590 November 2003. . .  [National Semiconductor]

Servo Pulse to PWM  -  converter connects an H-Bridge to radio control receivers or robotic circuits. . .  [Bob Blick's design]

Shop Safety Light  -  My 1200 square foot metal shop only has one small entrance door and no skylights. If the lights are turn off while inside, there is not enough light to safely find the door to exit the building. On a couple occasions, while I was quietly working at my test bench, my wife would walk into the shop, grab a garden tool and rush back out, turning off the lights and closing the door without thinking . . . [Hobby Circuit designed by David A. Johnson P.E.,  11/29/04]

Simple 0 to 24 dB Gain Amplifier & Balanced Line Driver  -  AS022 Application Note (App Note - 04/03/02) . . .  [Jenson Transformers]

Simple active-matrix-LCD bias supply operates from battery input  -  02/03/00 EDN Design Idea   Many active-matrix-LCD applications need multiple voltages for thin-film-transistor (TFT]bias. Typically, three voltages are necessary5V for the column driver; a positive voltage, such as 10V; and a negative voltage, such -5V, f. . .  [by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA]

Simple Circuit drives latching relays  -  02/01/96  EDN Design Idea   Figure 1 shows a low-parts-count circuit that can drive one- or two-coil latching relays. Latching relays are useful in sensitive analog designs. The 74ACT174 hex flip-flop has Ample capability to drive the Aromat TQ2E series of . . .  [by Roy McCammon, 3M Austin, TX]

Simple Circuit for Driving MicroController Friendly PWM Generators  -  Application Note Published 27-Jun-05. . .  [Microchip]

Simple Circuit Smoothly Drives Stepper Motors  -  05/28/09  EDN Design Idea   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. . .  [by Uwe Schüler, Institute of Physiology, Tübingen, Germany]

Simple Negative Supply Circuit  -  This simple circuit consists of two LEDs and a photo diode. It generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits, which need to have a true zero volts output. Note:  This circuit is not particularly efficient . . . [Hobby Circuit designed by David Johnson P.E.,  07/13/06]

Simple RS422 Converter for Minilogger  -  Build a simple line driver/reciever that meets RS422A for the MiniLogger V1. 0. Place a distant Minilogger and communicate over a full duplex serial line. . . .  [Wichit Sirichote, designer]

Simple single-cell white-LED driver uses improvised transformer  -  02/15/07  EDN Design Idea   Minimal component-count circuit boosts a single cell's voltage to light an LED. . .  [by Jim Grant, Scientific Controls, Orlando, FL]

Simple Solenoid Driver Is Adaptable and Efficient  -  06/04/12  EDN Design Idea   Use capacitive reactance to save energy while holding a solenoid in the energized position. Solenoid loads generally exhibit large hysteresis. Application of the rated voltage actuates these loads. Once they are in position, however, you can use a significantly lower voltage to thereafter reliably hold them on. A lower sustaining voltage results in less heat production and higher efficiency. . .  [by Jessica MacNeil]

Simple Solenoid Driver Reduces Power and Cost  -  07/18/96 EDN Design Idea   Solenoid  valves commonly control the flow of low-pressure gases and fluids in biological applications. A typical valve may operate at 12V and draw 1A. In systems using such valves, these power requirements can cause cost and space problems, even though a well-regulated supply is unnecessary. . .  [by TG Barnett, Queen Mary College, London England]

Simple VCOM adjustment uses any logic-supply voltage  -  09/30/04  EDN Design Idea   All TFT (thin-film-transistor] LCD panels require at least one appropriately tuned VCOM signal to provide a reference point for the panel's backplane. The exact value of VCOM varies from panel to panel, so the manufacturer must program. . .  [by Peter Khairolomour and Alan Li, Analog Devices, San Jose, CA]

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