On 03/01/2016 18:32, Eric Christopherson wrote:
On Sun, Jan 03, 2016, Adrian Graham wrote:
On 03/01/2016 02:06, "Terry Stewart" wrote:
It's interesting that none of my present TVs would tune properly to the RF
of the ZX81 but they will with some of the other RF only computers like the
Coco
On 03/01/2016 18:32, "Eric Christopherson"
wrote:
> On Sun, Jan 03, 2016, Adrian Graham wrote:
>> On 03/01/2016 02:06, "Terry Stewart" wrote:
>>
>>> It's interesting that none of my present TVs would tune properly to the RF
>>> of the ZX81 but they will with some of the other RF only computers
On Sun, Jan 03, 2016, Adrian Graham wrote:
> On 03/01/2016 02:06, "Terry Stewart" wrote:
>
> > It's interesting that none of my present TVs would tune properly to the RF
> > of the ZX81 but they will with some of the other RF only computers like the
> > Coco 1 and Atari 400? More circuitry in th
On 03/01/2016 02:06, "Terry Stewart" wrote:
> It's interesting that none of my present TVs would tune properly to the RF
> of the ZX81 but they will with some of the other RF only computers like the
> Coco 1 and Atari 400? More circuitry in the latter perhaps...
Going from an old, old memory fr
NPN is used for simple video amps... so 2n3904 or equivalent.
-Pete Rittwage
> Which type of transistor did you use for the mod? I don't see that in the
> writeup.. though I could well be missing it.
>
> Linked article says only "simple NPN"
>
> On Sat, Jan 2, 2016 at 5:18 PM, Terry Stewart
>
"It's interesting that none of my present TVs would tune properly to the RF
of the ZX81 but they will with some of the other RF only computers like the
Coco 1 and Atari 400? More circuitry in the latter perhaps..."
I'd have no idea about that one, other than I can verify that there was a
lot of v
On 3/01/2016 2:50 pm, "drlegendre ." wrote:
>
> Thanks Terry, fair enough. =)
>
> Has it been done with the ubiquitous 2NA? That one is probably in
> everybody's kit.. it might be even more common than the 3904
>
> Wondering.. is there a way to re-purpose that Chan. 3/4 switch as an RF /
> Com
Thanks Terry, fair enough. =)
Has it been done with the ubiquitous 2NA? That one is probably in
everybody's kit.. it might be even more common than the 3904
Wondering.. is there a way to re-purpose that Chan. 3/4 switch as an RF /
Composite switch? That way you'd still have a correct (local)
On 3/01/2016 12:48 pm, "drlegendre ." wrote:
>
> Which type of transistor did you use for the mod? I don't see that in the
> writeup.. though I could well be missing it.
>
> Linked article says only "simple NPN"
Good point. I'll have to mention it. It was just a common old 2n3904.
Terry (Tez)
Which type of transistor did you use for the mod? I don't see that in the
writeup.. though I could well be missing it.
Linked article says only "simple NPN"
On Sat, Jan 2, 2016 at 5:18 PM, Terry Stewart
wrote:
> Going through and testing the collection over this Xmas period also prods
> me into
Going through and testing the collection over this Xmas period also prods
me into doing mods I've procrastinated about. A very simple mod but here
is a write up for anyone who is interested...
http://www.classic-computers.org.nz/blog/2016-01-03-composite-video-for-zx81.htm
Terry (Tez)
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