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Driver Circuits, Page 1
Drivers: #'s      A      B - C       D - G       H - K       L - N       O - R       S      T     
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Last Updated on:
Saturday, August 30, 2014 10:27 AM

Circuits Designed by Dave Johnson, P.E. :
  • 3V BATTERY POWERED WHITE LED DRIVER  - The circuit below will drive any LED color, including white LEDs, using a DC power supply ranging from 2v to 3.3v.  White and blue LEDs normally require over 3v, so the circuit below uses a charge pump scheme to deliver a constant LED light intensity from a voltage less than 3v.  The LED is rapidly pulsed with 3ma peak current, which remains fairly constant, even as the battery voltage changes.  The circuit is designed only for low LED current applications.  A common CR2032 lithium coin battery should run the light for two days.  A pair of 2.5 amp-hour AA NiMH cells should operate the circuit for nearly a month.....[Designed by Dave Johnson, P.E.]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
“Chipiplexing” efficiently drives multiple LEDs using few microcontroller ports -  27-Nov-08 Issue of EDN  "Chipiplexing" approach simultaneously drives two LEDs..... [Design Idea by Guillermo Jaquenod, La Plata, Argentina]
1.5V battery powers white LED driver -  30-Sep-04 Issue of EDN  Although white LEDs are common in a variety of lighting applications, their 3 to 4V forward-voltage drop makes.... [Design Idea by Steve Caldwell, Maxim Integrated Products, Chandler, AZ]
12 DB Amplifier & High Current Line Driver with DC Servo -  AS024 Jenson Transformer Application Note  (app note 11/02)
12 Volt DC Fluorescent Lamp Driver (Aaron Cake) -  This fluorescent lamp driver uses a normal 120 to 6V step-down transformer in reverse to step12V to about350-Volt to drive a lamp without  need to warm  filaments. (added 04/03/02)
12 Volt fluorescent lamp drivers -  Three schematics of 12 V drivers for 2, 8 and 20 Watt, plus a lot of explanations about fluorescent tubes. Use the drivers for camping, emergency, boating, etc. [Manfred Mornhinweg]

128x64 LCD assembly Driver for AT90S2314 -  Here you will find a source code to drive a  graphics  LCD display 128x64 pixels with  AT90S2313.The  connections between LCD and  AVR, you will find  them to the source code.….(electronic circuit added 4/05)
16x16 LED Matrix & Driver -  (circuit / schematic design added 6/06)

20 dB Amplifier & High Current Balanced Line Driver -  AS023 Jenson Transformer Application Note  (app note 7/02)
300v Peak To Peak Signal Generator -  This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times..... [Designed by David A. Johnson]
30hz to 90hz Adj P.A. Driver -  (circuit / schematic design added 6/06)
3V BATTERY POWERED WHITE LED DRIVER  - The circuit below will drive any LED color, including white LEDs, using a DC power supply ranging from 2v to 3.3v.  White and blue LEDs normally require over 3v, so the circuit below uses a charge pump scheme to deliver a constant LED light intensity from a voltage less than 3v.  The LED is rapidly pulsed with 3ma peak current, which remains fairly constant, even as the battery voltage changes.  The circuit is designed only for low LED current applications.  A common CR2032 lithium coin battery should run the light for two days.  A pair of 2.5 amp-hour AA NiMH cells should operate the circuit for nearly a month.....[Designed by Dave Johnson, P.E.]
3-Ph BLDC Drive Control with Hall Sensors -  This reference design describes a 3-phase 4-quadrant sensor BLDC motor drive, which can run in both a speed open loop and a speed closed loop.  application is designed for MC68HC908MRxx family dedicated to motor control applications.  This reference design includes a description of  Motorola 68HC908MR32 features, basic motor ory, system design concept, hardware implementation, and(app note added 6/06)
3x3x3 LED Cube -  This circuit drives a 3x3x3 cube consisting of 27 white LEDs. The 4020 IC is a 14 stage binary counter and we have used 9 outputs. Each output drives 3 white LEDs in series and we have omitted a dropper resistor as the chip can only deliver a maximum of 15mA per output. The 4020 produces 512 different patterns before the sequence repeats and you have to build the project to see the effects it produces on the 3D cube.
4 Channel Timer using Atmel 89C4051 & MAX7219 display Driver -  using Atmel 89C4051 and MAX7219 display Driver (circuit / schematic design added 7/06)
50 Ohm Long Line Driver -  AS029 Jenson Transformer Application Note  (app note 6/07)
50 Ohm Long Line Receiver & Driver -  AS028 Jenson Transformer Application Note  (app note 6/07)
555 timer drives multiple LEDs from one NiMH cell -  2-Oct-08 Issue of EDN  Using a CMOS 555 timer, you can drive seven high-brightness LEDs from a single 1.25V cell..... [Design Idea by Chuck Irwin, Hendersonville, NC]
555 timer eliminates LED driver’s need for microprocessor control -  3-Sep-09 Issue of EDN  A timer provides programming pulses for lower cost than a microprocessor..... [Design Idea by Michael Day, Texas Instruments, Dallas, TX]
555 Timer-Based Flyback Transformer Driver -  My 24kV high voltage "Jacob's Ladder" from DIY flyback transformer driver using 555 timer….(electronic circuit added 02/09)
556 Switch Machine Driver -  The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. The circuits use LM556 dual timer chips to provide a PUSH-PULL output to reverse the polarity of the supply to the switch machine motors. [from Rob Paisley's Model Train web site]
556 Timer Stall-Motor Switch Machine Drivers -  The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. The circuits use LM556 dual timer chips to provide a PUSH-PULL output to reverse the polarity of the supply to the switch machine motors. [from Rob Paisley's Model Train web site]
5x5x5 LED cube -  This month's featured Gadget Freak is provided by an old favourite of the blog, Peter Griffiths. He shares all the details necessary to build your own 5 x 5 LED cube…
6 Aspect-Searchlight Signal Driver (LM555) -  The circuit on this page is a 6 Aspect driver for a bicolour LED type Searchlight Signal. The available signal indications are; SOLID RED, YELLOW, GREEN, and FLASHING RED, YELLOW and GREEN. The circuit can also turn the signal OFF for approach lighting if desired. [from Rob Paisley's Model Train web site]
74*245-based Motor driver -  A simple, time-honored approach is to use one or more 74*245 chips (normally  74AC245 is used for maximum current capability) to provide motor drive current. Here, each channel of drive power is provided by one or more buffer on  chip.  (added 6/06)

 

Drivers: #'s      A      B - C       D - G       H - K       L - N       O - R       S      T      U-Z


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