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Last Updated:  07/19/2015 07:27:19 PM

Circuits Designed by Dave Johnson, P.E. :

 

10 Turn Pot Forms Frequency Readout  -  Letís say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9. 99 would be impractical since . . . [Hobby Circuit designed by David A. Johnson P.E.,  01/27/08]

 

125Khz Ultra Pure Sine Wave Signal Source  -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/11/02]

 
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

+24V and-16V LCD Bias  -  Positive (24V AT 24mA) and negative (-16V AT 24mA) bias voltages for TFT LCD displays can be generated from a 3V to 6V input supply by the LT3487. . .  [Linear Technology App Note, Mar 24th 2010]

 

ĶP Displays 10 Bit Data on Three LEDs  -  11/07/96 EDN Design Idea   circuit in Figure 1 uses a PIC16C55 ĶP to read 10-bit binary data and directly display data in decimal format on three common-cathode LED displays. If value of data exceeds 999, displays show three hyphens (---) to represent. . .  [by Yongping Xia, Philips Lighting Electronics, Torrance, CA]

1 Hz-2.5 GHz with Blue 2x16 LCD display  -  This is a top quality project designed to obtain maximum performance. The hardware and software has been pushed to reach the frontier of technology. The transcendent is not only a frequency counter, it is a corner stone in your successfully constructions. . . .  [can't find owner's name on website]

 

10 Turn Pot Forms Frequency Readout  -  Letís say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9. 99 would be impractical since . . . [Hobby Circuit designed by David A. Johnson P.E.,  01/27/08]

 

12 DB Amplifier & High Current Line Driver with DC Servo  -  AS024 Application Note (app note 11/02) . . .  [Jenson Transformers]

 

12 Volt DC Fluorescent Lamp Driver  -  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. . . .  [Circuit designed by Aaron Cake]

 

12 Volt Knight Rider LED display  -  These circuits will give provide a Good Effect, duplicating the Knight Rider Lights. . .  [G.L. Chemelec]

 

125Khz Ultra Pure Sine Wave Signal Source  -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/11/02]

 

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. . .  [Designed by Vassilis Serasidis]

 

15V Battery Powers White LED Driver  -  09/30/04 EDN Design Idea   Although white LEDs are common in a variety of lighting applications, IR 3 to 4V forward-voltage drop makes low-voltage applications challenging. Charge pumps and or ICs are available for driving white LEDs, but y generally don't. . .  [by Steve Caldwell, Maxim Integrated Products, Chandler, AZ]

 

15x7 Display  -  This project is what you have been waiting for. Remember the scrolling signs you see in shops and on advertising billboards? Now you can program your own moving sign with all the effects you can think of. We have provided a blank canvas in the form of a scanning screen 15 LEDs by 7 LEDs andon this you can put anything you like. Of course this is not a two-day job. You have to learn how to program . . .  [email Colin Mitchell: talking AT tpg.com.au]

 

16x16 LED Matrix & Driver  -  In the early '80s, I read some articles on LED arrays. They described using arrays of 64 or more LEDs as crude oscilloscopes and other interesting things. I decided I'd make one myself - a really big array, 256 LEDs arranged as 16 columns by 16 rows. In 1983, while I was in my final semester of electronics classes at Monterey Peninsula College, I designed my array. I wanted a high-density array, in part to make the PC board smaller, but mainly to give a better appearance. So, I used the smallest LEDs I could find, 2mm x 2. 5mm. I was lucky and found that All Electronics was selling them in 200-packs for something like $20. I bought two packs - a fair sum for me at the time. . .  [John DuBois designer]

 

2:1 RGB Multiplexer and Cable Driver  -  The LT1675 is also an integrated 3-channel 2:1 multiplexer that includes gain of two for cable-driving applications. The basic configuration is shown in Figure 34. A single channel version for composite video applications is available as an LT1675-1. . . .  [Linear Technology App Note, Mar 25th 2010]

 

20 dB Amplifier & High Current Balanced Line Driver  -  AS023 Application Note (app note7/02) . . .  [Jenson Transformers]

 

2-Way Multiplexed LCD Drive & Low Cost A/D-Converter using V/F Techniques with COP8 MicroControllers  -  Application Note. . .  [National Semiconductor]

 

3.3V Baseband Video Splitter/Cable Driver (DC Coupled)  -  A simple video splitter application using an LT6206. Both amplifiers are driven by the input signal and each is configured for a gain of two, one for driving each output cable. Here again careful input biasing is required (or a negative supply as suggested previously). . . .  [Linear Technology App Note, Mar 25th 2010]

 

3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver (DC Coupled)  -  The LT6551 drives four cables and operating from a single 3.3V supply. The inputs need to have signals centered at 0. 83V for best linearity. This application would be typical of standard-definition studio-environment signal distribution equipment (RGBS format). . . .  [Linear Technology App Note, Mar 25th 2010]

 

3-Colour Display using Bicolour LEDs  -  . . .   

 

4 Channel Timer using Atmel 89C4051 & MAX7219 display Driver  -  using Atmel 89C4051 and MAX7219 display Driver. . .  [Wichit Sirichote, designer]

 

4:1 RGB Multiplexer  -  Since the LT6555 includes an enable control line, it is possible to extend the selection range of the multiplexer. This circuit shows two LT6555 devices in a configuration that provides 4:1 selection of RGB sources to an RGB output port (these could also be YPBPR signals as well, depending on the source). To avoid frequency. . .  [Linear Technology App Note, Mar 25th 2010]

 

400MHz, 5V Single Supply Video Driver (AC Coupled)  -  The LT6557 400MHz triple video driver is specifically designed to operate in 5V single supply AC-coupled applications as shown. The input biasing circuitry is contained on-chip for minimal external component count. A single resistor programs the biasing level of all three channels. . . .  [Linear Technology App Note, Mar 25th 2010]

 

5 Output Regulator for TFT-LCD Panels: 5V AT 0.5A, 22V AT 20mA,-10V AT 20mA, 3.3V AT 0.5A, 8V AT 80mA  -  The LT3513 5-output adjustable switching regulator provides power for large TFT-LCD panels, providing Vlogic, AVDD, Von and Voff. . .  [Linear Technology App Note, Mar 24th 2010]

 

5301 Wideband Fuel Mixture Display  -  This is the construction guide for the 5301 wideband fuel mixture display kit. The 5301 is the Tech Edge version (rather than the Jaycar version) of the modified Silicon Chip FMD design, and it features, compared to the original kit, double sided PCBs a new front panel design, in-built RS232 output and superbright GaAlAs 7 segment LEDs The 5301 uses the same version 1. 1 software as the 5300 and, unless noted otherwise, is known elsewhere on this web site as the 5300 unit or the modified FMD display. . . .  [Peter Gargano 2002]

 

5-Finger LED Counter  -  Our FIVER - P5 has many applications; Teach your children how to count to five! Draw attention and a smile. Press the push button five times and trigger your hobby rocket, etc. The unique small design will allow you to mount it almost anywhere. Operate it with 9V battery, 12V car battery, four 1. 5V batteries, or via one of our battery simulator kits. The alternative uses are endless. . . .  [Kit from Elich Industrial Development, Corp]

 

5x7 Display  -  Sit back and take a big breath. You are about to take part in one of the best microcomputer (microprocessor) projects you have seen. It uses a PIC16F84 micro and you will be shown how to program the chip to create quite amazing effects. It's a simple project and you will be starting at the beginning of programming, so don't worry if you have never worked with a microprocessor before. . .  [Collin Mitchell's web site]

 

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