mmpjh@brahms.amd.com (Javed Hussain) (04/25/91)
Hello netters!
Does anybody has any experience in hacking a TV to add video/audio inputs
if it already does not have? I have an old Toshiba TV of which tuner is not
working. I want to know if I can add a video/audio inputs so that it will
work with my VCR. I was looking at the schematics of the TV and saw something
like the following: ________
--->--|________|
|
|sound
|
-------------- VIDEO -----------------
| PIF & AFT |--------->---| Video & Chroma|
--------------- ------------------
I was wondering if I disconnect the line called VIDEO and connect it to
video out of my VCR, will it work?
Any suggestions?
Thanks,
Javed mmpjh@brahms.amd.comstrong@tc.fluke.COM (Norm Strong) (04/26/91)
In article <1991Apr24.185624.17475@amd.com> mmpjh@brahms.amd.com (Javed Hussain) writes: }Hello netters! }Does anybody has any experience in hacking a TV to add video/audio inputs }if it already does not have? I have an old Toshiba TV of which tuner is not }working. I want to know if I can add a video/audio inputs so that it will }work with my VCR. I was looking at the schematics of the TV and saw something }like the following: ________ } --->--|________| } | } |sound } | } -------------- VIDEO ----------------- } | PIF & AFT |--------->---| Video & Chroma| } --------------- ------------------ } }I was wondering if I disconnect the line called VIDEO and connect it to }video out of my VCR, will it work? I wouldn't recommend this. Many TV sets have off line power supplies that leave the chassis hot. They get away with this because the antenna is transformer coupled, and all the controls have plastic shafts. If you insist, then check the potential of the chassis relative to ground with the plug inserted in both directions. If it's completely cold, you're safe. -- Norm Strong (strong@tc.fluke.com) 2528 31st S. Seattle WA 98144 USA
dave@boingo.med.jhu.edu (David Heath) (04/29/91)
strong@tc.fluke.COM (Norm Strong) writes: >In article <1991Apr24.185624.17475@amd.com> mmpjh@brahms.amd.com (Javed Hussain) writes: >}Hello netters! >}I was wondering if I disconnect the line called VIDEO and connect it to >}video out of my VCR, will it work? >I wouldn't recommend this. Many TV sets have off line power supplies that >leave the chassis hot. They get away with this because the antenna is >transformer coupled, and all the controls have plastic shafts. >If you insist, then check the potential of the chassis relative to ground >with the plug inserted in both directions. If it's completely cold, >you're safe. I have made similar modifications to a televisions in the past. In both cases, there was room inside the set to install an isolation transformer on the AC line. You have to be careful that the magnetic field from the transformer is not strong enough to distort the picture (especially on color tv's.) -dave heath dave@boingo.med.jhu.edu
ron@vicorp.com (Ron Peterson) (04/30/91)
In article <1991Apr28.200830.28926@boingo.med.jhu.edu> dave@boingo.med.jhu.edu (David Heath) writes: >strong@tc.fluke.COM (Norm Strong) writes: >>In article <1991Apr24.185624.17475@amd.com> mmpjh@brahms.amd.com (Javed Hussain) writes: >>}Hello netters! >>}I was wondering if I disconnect the line called VIDEO and connect it to >>}video out of my VCR, will it work? > >>I wouldn't recommend this. Many TV sets have off line power supplies that >>leave the chassis hot. They get away with this because the antenna is >>transformer coupled, and all the controls have plastic shafts. > >>If you insist, then check the potential of the chassis relative to ground >>with the plug inserted in both directions. If it's completely cold, >>you're safe. > >I have made similar modifications to a televisions in the past. In both >cases, there was room inside the set to install an isolation transformer >on the AC line. You have to be careful that the magnetic field from the >transformer is not strong enough to distort the picture (especially on >color tv's.) > A cheaper alternative might be to isolate the video/audio lines rather than the AC line. A small audio transformer costs only a few dollars. (Are there video frequency transformers? There must be since there are RF frequency transformers.) Optoisolaters would work also, although you'd need an external power source. ron@vicorp.com or uunet!vicorp!ron
robf@mcs213j.cs.umr.edu (Rob Fugina) (05/07/91)
In article <1991Apr29.210743.3390@vicorp.com> ron@vicorp.com (Ron Peterson) writes: >A cheaper alternative might be to isolate the video/audio lines rather >than the AC line. A small audio transformer costs only a few dollars. >(Are there video frequency transformers? There must be since there are >RF frequency transformers.) Optoisolaters would work also, although you'd >need an external power source. >ron@vicorp.com or uunet!vicorp!ron I have what I think is a pertinent question here; are the signal levels within TVs/VCRs consistent with "line-level" standards? I suppose as long as you find the right place in the TV/VCR, you could convert a signal to the correct level, but is that necessary, or is there consistently somewhere to just tap right in? Me robf@cs.umr.edu
ez002717@mr-ranger.ucdavis.edu (05/08/91)
i have several circuit schematics that were created in dr halo .pic format...i can use cshow to view them...what i would like to dois convert them to a format that i can print out (on an hp laserjet) ...gif format would be fine...does anyone have experience with software that will either convert .pic to .gif or print out .pic? ...i ask here b/c maybe others have had ckt schems in odd formats ...thanx console cowboy - desperado of the datasphere ps...a shareware suggestion would be best