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Television / Video Electronic Circuits, Page 4
Television / Video Circuits:    #-A      B-K     L-T     U-Z
Last Updated on: Friday, August 29, 2008 02:34 PM
 
Circuits Designed by Dave Johnson, P.E.:
  • VIDEO SIGNAL EDGE ENHANCEMENTS
    I designed this circuit many years ago, based on the claims that the technique would improve the quality of standard TV images. The circuit adds information to the edges of the objects and was reported to bring out more detail. After building and testing the circuit, I could definitely see a difference between it and a regular TV display but I don’t think most people would go to the trouble of installing the circuit for only a marginal improvement. Still, it is an interesting circuit with which someone might experiment.


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

UHF TV PreAmplifier:  (circuit / schematic design added 6/06)

Using the AD7877 Touch Screen Controller and the Intel PXA250 Processor Under Windows CE.NET:  AN-738 - Analog Devices Application Notes  (app note added 2/06)

Using the ML6428 as a Clamp and 27MHz Filter / ABR-42024:  Fairchild Application Notes / (app note added 6/06)

Using the Noise Reduction Feature on the AD7877:  AN-766 - Analog Devices Application Notes  (app note added 2/06)

V 44 Video Distribution Amplifier Schematic :  (circuit / schematic design added 6/06)

VG Converter for Video Projectors and Fixed Frequency Monitors:  (electronic (schematic / circuit added 4/02)

VG Generator that Displays an Image in the XS Board RAM on a VGMonitor:  example of using Virtex series FPGA to generate VGA signals (added 5/02)

VG to PAL and NTSC Converter:  (electronic (schematic / circuit added 4/02)

VG to TV Converter:  (electronic (schematic / circuit added 4/02)

VG to TV Information Center:  (electronic (schematic / circuit added 4/02)

VGA Hardware Screen Blanker:  It is a simple device that connects between your keyboard and VGA card feature connector, and will blank (or blink) the screen after a certain amount of non-keyboard activity. This device is totally software and O/S independent. The ONLY screen blanker that can be guaranteed to work !....  (added 6/06) nov 05

VG-to-Video in for DOS:  (electronic (schematic / circuit added 4/02)

VGTV Version 2.0:  converts RGB from VGA to card to PAL composite video (added 5/02)

VHF/UHF TV Modulator:  Elektor January1985 /(added 7/02)

Video Amplifier Circuit from Discrete Transistors:  ASCII format (added 4/02)

Video Amplifier provides digital gain control:  08/17/00 EDN-Design Ideas  / (added 11/05)   

Video Amplifier with Sync Stripper and PC Restore:  This document is an App Note of200 MHz video amplifier, sync stripper and DC restorer in PDF format. (app note added 5/02)

Video Amplifiers Make Low Cost Fader:  05/12/94 EDN-Design Ideas / (added 3/03) - Bandwidths handle SVGA or Super Mac (up to 70-MHz) video signals without degradation, fading is voltage controlled

Video circuit clamps under all conditions :  04/23/98 EDN-Design Ideas / (added 11/05) [Note:  File contains multiple circuits - scroll to find this circuit.]  Many video-circuit clamps operate well in the presence of a composite-video signal but cannot achieve a clamp level with signals other than composite video or in the absence of an input signal. The circuit in Figure 1, developed for the ADC1175 (a popular and inexpensive, high-performance, 8-bit, 20M-sample/sec ADC), provides the normal back-porch clamp function to the input of the ADC in the presence of a composite-video signal. The circuit further ensures that the voltage presented to the ADC is within its correct operating range in the absence of an input signal and forces any signal other than composite video to be within the ADC's input common-mode range....

Video Circuit Clamps under All Conditions:  04/23/98 EDN-Design Ideas  / (added 8/03)   -- Many video-circuit Clamps operate well in the presence of a composite-video signal but cannot achieve a Clamp level with signals other than composite video or in the absence of an input signal. This circuit, developed for the ADC1175 (a popular and inexpensive, high-performance, 8-bit, 20M-sample/sec ADC), provides the normal back-porch Clamp function to the input of the ADC in the presence of a composite-video signal. The circuit further ensures that the voltage presented to the ADC is within its correct operating range in the absence of an input signal and forces any signal other than composite video to be within the ADCs input common-mode range

Video Circuit Collection:  AN57 - Linear Technology - AN57, the Video Circuit Collection, features a variety of video circuits designed at LTC. The LT1204 70MHz multiplexer is featured in a number of circuits which require excellent video isolation from channel to channel. High speed voltage and current feedback amplifiers are highlighted throughout the section on video processing circuits. There is a section on applying Current Feedback Amplifiers (CFAs) and a number of articles taken from the Linear Technology magazine.

Video Circuits Collection:  DN57 -  Design Notes (Linear Technology) (app note added 1/06)

Video Difference Amplifier Brings Versatility to Low Voltage Applications:  DN343 -  Design Notes (Linear Technology) (app note added 1/06)

Video emitter uses Battery Power:  08/30/01 EDN Design Ideas  /  (added 1/05)  The block diagram in Figure 1 shows how to make a cable-free, direct-video system. The system allows users to walk from booth to booth at an exhibition to interview people and to display the interviews in real time on three screens at key locations. You can use the small and simple system each time you need to capture image and sound on the run. ...

Video Equalizer Sharpens VCR Images:  10/08/98 EDN-Design Ideas / (added 3/03)   -- Sharpens picture images without introducing the shadows, ringing, and noise often observed with commercial video equalizers

Video Fader PreServes Synchronization:  07/06/95 EDN-Design Ideas / (added 3/03) The common video effect "fade to black" is usually accomplished by increasing video signal attenuation to the point where the picture disappears, leaving a black screen. As the composite signal is attenuated, the signal's sync amplitude becomes too small to synchronize the picture properly, and the picture rolls and tears. One solution is to run a separate sync line to the monitor, but this is not a viable choice in composite systems....

Video Generators:  many test picture generation circuits (added 5/02)

Video In:  for the XSV Board (Univ. of Queensland) (added 4/02)

Video Inverter:  This is a simple1-transistor circuit to invert the whole video signal, including sync pulses. (added 5/02)

Video Line Selector:  (circuit added 9/04)

Video multiplexer uses high speed op amps:  08/21/03 EDN Design Ideas  /  (added 1/05)  Video multiplexers route video from several sources to a single channel. Low-end consumer products use CMOS analog switches and multiplexers, such as the 4066 and 4051. Unfortunately, these devices have a series on-resistance that ranges from approximately 100Ω to 1 kΩ, a resistance that is not constant with video level and that appears in series with the signal....

Video Ping Pong Game:  (circuit / schematic design added 6/06)

Video Signal Distribution using Low Supply Voltage Amplifiers:  DN327 -  Design Notes (Linear Technology) (app note added 1/06)

Video Sync Inverter Circuit:  simple circuit to invert TTL level sync signals (added 6/06)

Video Transmission over Twisted Pair Wire:  National Semiconductor - Application Note   (app note added 2/06)

Video/Audio Wireless Transmitter #2:  circuit diagram and project description (added 5/02)

Video/Audio Wireless Transmitter:  (electronic circuit added 7/03)

VISW 8 x 4 Stereo Audio/Video Router :  (circuit added 7/02)

Voice of Music V-M 1432:  SW radio information page (vintage radio (schematic / circuit added 9/06)

Zenith 12H090 AM/SW/FM45/FM100:  (vintage  radio/phono schematic circuit added 9/06)

Zenith H725Z1 (Chassis 7G01Z1):  AM/FM radio schematic (vintage television (schematic / circuit added 9/06)

Zenith M660 (chassis 5M20):  Communications receiver alignment info and schematic (vintage television (schematic / circuit added 9/06)

Television / Video Circuits:    #-A      B-K     L-T     U-Z



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