[Coco] Trying to find out what signal a composite adapter is using.

[Mark Ormond]

Ok, here is a link for the schematic. As for the caps used, it's what is on the original board.

http://www.svfdtn.com/cbm/coco2comp.jpg



-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On Behalf Of gene heskett
Sent: Sunday, December 11, 2011 1:08 PM
To: coco at maltedmedia.com
Subject: Re: [Coco] Trying to find out what signal a composite adapter is using.

On Sunday, December 11, 2011 01:00:16 PM Mark Ormond did opine:

> I'm copying the coco2 composite video adapter from John's coco 2 and I
> was wondering if anyone knew what is located on the left side of c32
> (from the front) on a 8709416 board?
> 
> Here is what I have so far.
> 
> [cid:image002.png at 01CCB7FA.DB50E2C0]
> 
Unforch, linux firefox STILL doesn't know what to do with a cid: address, 
so I can't help there.

> Parts list.
> 
> 
> 
> 
> 
> C1 1uf 50V
> 
> C2 1uf 50V

These 2 capacitors will have about 2 years shelf life if they are 
electrolytic, 5 volts or less of bias across them allows them to deform and 
lose capacitance rapidly.  At 2 yo age, they will likely be less than .1 uf 
in actual capacity.  Use the most compact mylar types you can find, they 
will last at least till the rapture.
 
> C3 30pf
> 
> C4 30pf
> 
> C5 223Z (22nf)
> 
> T1 NTE123AP
> 
> T2 2N3904
> 
> T3 NTE123AP
> 
> R1 2.2K
> 
> R2 1K
> 
> R3 200K
> 
> R4 41 ohm
> 
> R5 220 ohm
> 
> R6 200K
> 
> R7 2.2K
> 
> R8 3.3K
> 
> 
> 
> 
> 
> GND = GND
> 
> G = Pin 8 of MC1372P
> 
> Y = Y on Modulator
> 
> S = S on Modulator
> 
> R = Left side of C32 (Looking from front)
> 
> 
> 
> Later,
> 
> dabone


Cheers, Gene
-- 
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