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Driver Circuits, Page 8
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Last Updated on:
Monday, October 03, 2011 06:08 PM

Circuits Designed by Dave Johnson, P.E. :
  • 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 output.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Scheme provides high-side current-sensing for white-LED drivers -  19-Feb-04 Issue of EDN  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 forward-bias these LEDs, a voltage of 10 to 16V comes from an inductor-based boost regulator, such as an SP6690..... [Design Idea by Dimitry Goder, Sipex Corp, San Jose, CA]
Senses & displays ambient light intensity -  11/09/06 EDN-Design Ideas.....LED doubles as photosensor and visual indicator of ambient-light intensity..... EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.
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..... [The site is owned by Duane C. Johnson]

 

Serial Comms to LED Driver -  (circuit / schematic added 2/03)
Serial Interface & bias supply for Seiko-Epson G1216B dot graphics display -  (circuit schematic added 6/07)
Serial Interface for Truly MTC-C162DPLY-2N, 2 line X 16 char LCD display -  (schematic / circuit added 6/07)
Series Connected Voltage Boost Circuit for a Battery Operated LED Lantern -  A circuit that goes in series with a white LED and a 1.5 volt cell to make > 3 Volts to drive a white LED.....(schematic / circuit added 6/07)
Series White LED Driver  -  National Semiconductor Application Note LM3590 November 2003.....[App Note]
Servo Pulse to PWM -  converter connects an H-Bridge to radio control receivers or robotic circuits......
Simple 0 to 24 dB Gain Amplifier & Balanced Line Driver -  AS022 Jenson Transformer Application Note  (app note 04/03/02)
Simple Active Matrix LCD Bias Supply Operates from Battery Input -  02/03/00 EDN-Design Ideas.....Many active-matrix-LCD applications need multiple voltages for thin-film-transistor (TFT]bias. Typically, three voltages .... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.

Simple Active-Matrix LCD Bias Supply Operates from Battery Input -  02/03/00 EDN-Design Ideas.....Many active-matrix-LCD applications need multiple voltages for thin-film-transistor (TFT]bias. Typically, three voltages are necessary  5V for  column driver; a positive voltage, such as 10V; and a negative voltage, such -5V, for  TFT gate drive, or row driver. For handheld electronic devices, a battery must..... [Design Idea by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA]
Simple Circuit Drives Latching Relays -  02/01/96 EDN-Design Ideas.....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 latching relays. Both windings for the TQ2E-L2-5V two-coil relay are on the same magnetic element, so the windings' fields add. You..... [Design Idea by Roy McCammon, 3M Austin, TX]
Simple Circuit for Driving MicroController Friendly PWM Generators -  Microchip Application Note Published 27-Jun-05.....[App Note]
Simple circuit smoothly drives stepper-motors -  28-May-09 Issue of EDN  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 analog switch allows bidirectional switching..... [Design Idea by Uwe Schüler, Institute of Physiology, Tübingen, Germany]
Simple single cell white LED driver uses improvised transformer -  15-Feb-07 Issue of EDN  Minimal component-count circuit boosts a single cell's voltage to light an LED..... [Design Idea by Jim Grant, Scientific Controls, Orlando, FL; Edited by Brad Thompson and Fran Granville]
Simple Solenoid Driver Reduces Power & Cost -  07/18/96 EDN-Design Ideas EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Simple VCOM adjustment uses any logic supply voltage -  30-Sep-04 Issue of EDN  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 the voltage at the factory to match the characteristics of each screen..... [Design Idea by Peter Khairolomour and Alan Li, Analog Devices, San Jose, CA]
Simplest LED Flasher circuit -  (schematic / circuit added 6/07)
Simplified white LED flasher operates from one cell -  26-May-05 Issue of EDN  1.5V circuit flashes white LED..... [Design Idea by Anthony H Smith, Scitech, Biddenham, England; Edited by Brad Thompson]


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