Enterprise Forever

:UK => Hardware => Display => Topic started by: jackleather on 2007.March.06. 17:37:23

Title: Adding Colour Composite Video Out
Post by: jackleather on 2007.March.06. 17:37:23
Hi, i am just about to do the Composite Video Mod (http://ep.homeserver.hu/Hardware/Composite/Composite.htm).

As the transistor used in the project (BC182) is hard to get hold of now could anyone advise on a replacement e.g. 2N3904.

Has anyone done this mod? could someone give me the jist of the instructions, which is written in Hungarian, on the page above. Are the any pitfalls that i should watch out for?

thanks

Jack
Title: Re: Adding Colour Composite Video Out
Post by: Zozosoft on 2007.March.06. 20:34:47
Your TV/monitor not have RGB input? (Scart connector) The RGB cable is the best for the Enterprise.

I used simplified version for color composite output:
[attachimg=1]
On the monitor connector I used the original composit output pin, and added a switch for select the monochrome/color mode. (For TEXT 80 mode the monochrome is better.)
Title: Re: Adding Colour Composite Video Out
Post by: jackleather on 2007.March.07. 19:21:25
thanks, i will try this.
Title: Re: Adding Colour Composite Video Out
Post by: jackleather on 2007.March.12. 17:27:49
Quote
I used simplified version for color composite output:

What is the value of the resistor you have added?
Title: Re: Adding Colour Composite Video Out
Post by: Zozosoft on 2007.March.12. 18:13:39
What is the value of the resistor you have added?
110 ohm
Title: Re: Adding Colour Composite Video Out
Post by: jackleather on 2007.March.20. 00:40:39
i was just  wondering, after doing a composite video mod on a zx81...wouldn't a single transistor buffer circuit be safer? or is TR8 doing this job? could i still add a 2n2222a?