Experiences with a composite video mod for a Sinclair ZX81

drlegendre . drlegendre at gmail.com
Sat Jan 2 19:50:14 CST 2016

Thanks Terry, fair enough. =)

Has it been done with the ubiquitous 2N2222A? 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) RF output, as
well as the Composite video.

On Sat, Jan 2, 2016 at 6:46 PM, Terry Stewart <terry at webweavers.co.nz>

> On 3/01/2016 12:48 pm, "drlegendre ." <drlegendre at gmail.com> 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)

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