Audio/Video Auto Switch

raudio1969 · 29th December 2008, 12:00 AM

Audio/Video Auto Switch

I recently built this widget for my parents. Their TV set has only one audio/video input and they have two video sources, a VCR and DVD player. The VCR has two inputs, but using the DVD player involved switching both the VCR and DVD player on and selecting the proper input on the VCR and TV set. I thought it made sense, but they had trouble with it. I designed and constructed this audio/video auto switch to make the switching more automated. The video B input detects the voltage from the video output of the DVD player and connects the DVD player (video B) to the TV set (video COM). When the DVD player is switched off, the VCR is connected to the TV set (video A). If anyone finds this useful, please let me know. Also, I thought of designing a printed circuit board and fitting it into a standard enclosure. Would anyone be interested in purchasing the bare PCB, Assembled PCB, and/or complete assembly?

- Richard

raudio1969 · 29th December 2008, 12:10 AM

Here is the schematic.

raudio1969 · 14th September 2009, 01:51 AM

I have completed a PCB layout for this project. There were some changes to the schematic to include control in and out. The layout is different from the prototype and should fit into a Pac-Tec enclosure with holes added to the front and back panels. I will be ordering PCB's soon. Is there any interest?

- Richard

giokat · 2nd November 2009, 10:13 AM

Hi Richard,
this project is very interesting to me!
Can I reproduce it by using the schematics as is, or are there any changes or improvements since when you published the project?
Thanks!!!!
Best Regarda,
Giorgio Cattaneo - Rome, Italy

raudio1969 · 6th November 2009, 02:17 AM

Thank you for your interest.

The schematic matches the first hand-wired working prototype. I have added some features which are in the PCB layout, but not tested yet. I added an optional control in and out and another relay to keep a 75 ohm load on the un-connected video source. I will post the schematic in the next few days.

Best regards,

Richard

raudio1969 · 11th November 2009, 01:17 AM

Attached is the updated schematic. The changes are untested.

- Richard

giokat · 12th November 2009, 01:15 PM

Quote:

Originally Posted by raudio1969

Attached is the updated schematic. The changes are untested.

- Richard

WOW ! Thank you so much!!!
- Giorgio

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
auto speakers for home audio	Carlp	Multi-Way	3	29th March 2007 11:47 AM
Audio Auto Switch	mariorockero	Analogue Source	0	31st March 2004 02:30 AM
any recommanded Video switch chips?	takashi	Parts	0	28th February 2003 02:35 PM
Subwoofer auto on/off switch?	Axeman	Solid State	2	30th May 2002 06:07 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

2nd November 2009, 10:13 AM	#4
giokat diyAudio Member Join Date: Nov 2009	Hi Richard, this project is very interesting to me! Can I reproduce it by using the schematics as is, or are there any changes or improvements since when you published the project? Thanks!!!! Best Regarda, Giorgio Cattaneo - Rome, Italy

6th November 2009, 02:17 AM	#5
raudio1969 diyAudio Member Join Date: Sep 2007	Thank you for your interest. The schematic matches the first hand-wired working prototype. I have added some features which are in the PCB layout, but not tested yet. I added an optional control in and out and another relay to keep a 75 ohm load on the un-connected video source. I will post the schematic in the next few days. Best regards, Richard

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)