Videopac / Odyssey2 forum
January 23, 2020, 10:07:49 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: If you have some news and you want it to be shown here, pm Janzl!
 
   Home   arcade Help Login Register links videopac.nl  
Pages: 1 2 [3] 4 5   Go Down
  Print  
Author Topic: Video Mod for Odyssey2  (Read 28945 times)
Ozyr
Totally devoted to Videopac
*******
Posts: 1508


Packrat Video Games


david.flemming.9
WWW
« Reply #30 on: November 29, 2009, 06:51:03 AM »

THis hasn't been talked about in awhile.

I went and ordered the transistor from Frys. Only complaint - they only had one left for ordering (you could still do store pickup - but I don't have one where I live). Hope that one will suffice. I'm not done with this darn thing yet!

Have to admit that getting the right transistor is a pain. WOuld the Europeon one works in the States? Maybe I'll go that route if worse comes to worse.
Logged

Rene_G7400
Pedit5
I take the Videopac and leave the Canoli!
*
Posts: 2519



WWW
« Reply #31 on: November 29, 2009, 04:32:51 PM »

I've checked frys.com, but they didn't have many "normal" transistors. Isn't there a better online shop for electronic components in the U.S. ?

If you really want to boost the video output of the Odyssey2, you should build a circuit like in this topic: http://videopac.nl/forum/index.php?topic=592
Logged
Ozyr
Totally devoted to Videopac
*******
Posts: 1508


Packrat Video Games


david.flemming.9
WWW
« Reply #32 on: November 30, 2009, 03:01:30 AM »

I've checked frys.com, but they didn't have many "normal" transistors. Isn't there a better online shop for electronic components in the U.S. ?

If you really want to boost the video output of the Odyssey2, you should build a circuit like in this topic: http://videopac.nl/forum/index.php?topic=592

Okay. What is a 'normal' transistor? I just don't know electronics, besides how to solder stuff together.

I've posted in the other topic. Parts again are the issue - and not 100% knowing what I'm doing either.
For now, looks like I wasted around $9 (with the bloody shipping) to get a transistor that will not work well.
Maybe RF is good enough for now (till my old TV sets crap out - and they are slowly).
 Sad
Logged

Rene_G7400
Pedit5
I take the Videopac and leave the Canoli!
*
Posts: 2519



WWW
« Reply #33 on: November 30, 2009, 10:09:37 AM »

Okay. What is a 'normal' transistor? I just don't know electronics, besides how to solder stuff together.

A "normal" transistor is made of silicon, type NPN, low voltage (20V - 65V), low current (100mA - 500mA), low power (100mW - 500mW), high gain (200 - 500).

I've posted in the other topic. Parts again are the issue - and not 100% knowing what I'm doing either.
For now, looks like I wasted around $9 (with the bloody shipping) to get a transistor that will not work well.

The simple A/V mod (with 1 transistor) does work well on my TV. But if the picture is still too dark on your TV, you might need to amplify the signal with an extra transistor. Or you can just turn up the contrast (not the brightness) of your TV. Or you could try to run the video signal through a VCR. VCR's have an AGC circuit (automatic gain control), which should result in the proper video level.

Logged
Ozyr
Totally devoted to Videopac
*******
Posts: 1508


Packrat Video Games


david.flemming.9
WWW
« Reply #34 on: November 30, 2009, 04:05:54 PM »

Okay, thanks for the advice. I will see what happens this transistor when I get it (and have time to put it in). Will report back at that time...
Logged

horseboy
Trying to get the cartridge in...
*
Posts: 4


« Reply #35 on: July 30, 2010, 05:42:57 PM »

Did you ever get this going? I want to do a video mod for my O2. If I can't get an RGB mod then this would be good to. Are there any explanations of this mod with pics? I know this site used to have some pics of the mod (is it the same one?), but they aren't up anymore. Thanks in advance.
Logged
Rene_G7400
Pedit5
I take the Videopac and leave the Canoli!
*
Posts: 2519



WWW
« Reply #36 on: July 30, 2010, 11:36:15 PM »

There is a picture on the first page of this thread (broken link fixed).
Logged
Ozyr
Totally devoted to Videopac
*******
Posts: 1508


Packrat Video Games


david.flemming.9
WWW
« Reply #37 on: July 31, 2010, 12:56:09 AM »

I personally never got a good video MOD working. Problem for me is finding a source for the proper transistor.

So, I stil use RF... even on my HD TV set.
Logged

Ozyr
Totally devoted to Videopac
*******
Posts: 1508


Packrat Video Games


david.flemming.9
WWW
« Reply #38 on: March 03, 2011, 03:40:02 PM »

I'd still like to know if anyone can come up with a good working V-MOD for the O2!

I've come across this - http://www.risingstuff.com/forums/viewtopic.php?f=28&t=1773 - but don't feel like joining another forum, just for a MOD. I honestly don't get it, as the schematic doesn't make sense to me (as in where does the 1,2,3,4, go to?).

I may try this too - http://solarfox.triluminary.net/hwh_o2avc_p2.php - different, but a possibility.

Main issue still is, where to get the parts. I miss the old-fashioned Radio Shack store so much.
Logged

gertk
Post Axe Pete!
*****
Posts: 859



gertk64
WWW
« Reply #39 on: March 04, 2011, 12:14:49 AM »

I'd still like to know if anyone can come up with a good working V-MOD for the O2!

I've come across this - http://www.risingstuff.com/forums/viewtopic.php?f=28&t=1773 - but don't feel like joining another forum, just for a MOD. I honestly don't get it, as the schematic doesn't make sense to me (as in where does the 1,2,3,4, go to?).

I may try this too - http://solarfox.triluminary.net/hwh_o2avc_p2.php - different, but a possibility.

Main issue still is, where to get the parts. I miss the old-fashioned Radio Shack store so much.

For the transistor: any good quality NPN transistor will do. American types like the 2SC945 or 2n2222 or European BC639, BC337
The video bandwidth of the Odyssey2 is not that high...

For the G7400 video circuit I used a 2SC945 from a broken PC power supply.. http://videopac.nl/forum/index.php?topic=1594.0 
However the encoder chips of the G7400 and the Odyssey2 are different so the same circuit might not work on the Odyssey2
Principle of all the mods is the same, buffer the output of the encoder chip so you can feed it to the low impendance (75 ohm) CVBS input of your TV/monitor.
Logged

>>G7000 G7200(P+S) G7400 N60 JET27 VG5000 ZX80 ZX81 ORIC-1 COMX35 Aquarius<<
Rene_G7400
Pedit5
I take the Videopac and leave the Canoli!
*
Posts: 2519



WWW
« Reply #40 on: March 04, 2011, 05:26:02 PM »


I've come across this - http://www.risingstuff.com/forums/viewtopic.php?f=28&t=1773 - but don't feel like joining another forum, just for a MOD. I honestly don't get it, as the schematic doesn't make sense to me (as in where does the 1,2,3,4, go to?).


That's my drawing they've used!
Logged
Rene_G7400
Pedit5
I take the Videopac and leave the Canoli!
*
Posts: 2519



WWW
« Reply #41 on: March 04, 2011, 05:40:56 PM »


I may try this too - http://solarfox.triluminary.net/hwh_o2avc_p2.php - different, but a possibility.


This is unnecessary complicated, you can build an emitter follower circuit with a single transistor for a video mod (without any resistor or capacitor). (The video output delivers the required DC bias.)

Logged
TedFoolery
Played Munchkin once...
**
Posts: 75


« Reply #42 on: March 04, 2011, 11:03:51 PM »

Yes. I just added video out to my O2 a few weeks ago and it is just a transistor and possibly a resistor. I my memory is correct, I tried it with and without the resistor and didn't see a difference. I forget if I left it in or not.

Similar mod to my g7400 a few years ago. Both work fine. The transistor is a basic radio shack NPN.
Logged
Ozyr
Totally devoted to Videopac
*******
Posts: 1508


Packrat Video Games


david.flemming.9
WWW
« Reply #43 on: March 05, 2011, 02:01:32 AM »


I've come across this - http://www.risingstuff.com/forums/viewtopic.php?f=28&t=1773 - but don't feel like joining another forum, just for a MOD. I honestly don't get it, as the schematic doesn't make sense to me (as in where does the 1,2,3,4, go to?).


That's my drawing they've used!

And I still don't get it. Where does 1,2,3,4 go to?
Logged

Ozyr
Totally devoted to Videopac
*******
Posts: 1508


Packrat Video Games


david.flemming.9
WWW
« Reply #44 on: March 05, 2011, 02:02:28 AM »


I may try this too - http://solarfox.triluminary.net/hwh_o2avc_p2.php - different, but a possibility.


This is unnecessary complicated, you can build an emitter follower circuit with a single transistor for a video mod (without any resistor or capacitor). (The video output delivers the required DC bias.)

I've tried the 1 transistor video mod, with not success. Main reason I'm looking for something else.
Logged

Pages: 1 2 [3] 4 5   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!