Re: Star Wars Analog out

To much time on tempest boards. These have the avg chip which is bad.

So other than the replacement boards that are floating around, anyone know
of a stash of these chips?

Kevin
On Jun 14, 2012 4:11 PM, "Kevin Moore" <talon.k@gmail.com> wrote:

> I've never run across this, so it seems a bit strange to me, and I've not
> had alot of time to digest what is actually happening here.
>
> Basically, for a split second there was a video screen, then nothing. I
> assume first time powering up the circuits after replacing broken
> resistors, and .1 caps might have done something in.
> Checking voltages on the outputs showed there was AC voltage in range, but
> DC was all Negative on both X and Y.
> So I put the scope to the outputs, and sure enough, I've got nothing but
> negative swings, looks like the positive swings get clipped at the zero
> crossing.
>
> I did a quick check of the +-15 and they were good. Checked to make sure
> those voltages were reaching my tl082's
>
> The outputs from the Tl082 pin 7 will only swing one direction, and then
> the output on pin 1 will swing the opposite.
>
> What controls the +- swings? the DG201 switches? Why would it be affecting
> both x and y.
>
> Kevin
>
>
>

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Received on Thu Jun 14 23:18:31 2012