exxos's Atari, Amiga & retro forum

exxos wrote: 29 Nov 2018 00:16 They should be OK I think...

I can only assume really that your chip is faulty as I can't see anything wrong anywhere. Either that or the pinout in the data sheet is wrong..

Will try and build mine up tomorrow and see what happens..

Either I now have added to the BAD collection of BAD DMAs, BAD GALs with a BAD DAC or as you say its something else. If this carries on I am going to get a complex of some sort :)

As you say just need another one of these boards to compare against - will now await the next one to be built.

Yeah, bad silicon seems to be the thing of the month...

Will solder the chip and just out power to it and see what voltages I get compared to yours..

But first a quick nap...

exxos wrote: 29 Nov 2018 01:05 But first a quick nap...

You sleep? You have now shattered the illusion that you never sleep :D. Unless a quick nap is actually a ruse to go and do some more soldering or designing.

Icky wrote: 29 Nov 2018 08:34

exxos wrote: 29 Nov 2018 01:05 But first a quick nap...

You sleep? You have now shattered the illusion that you never sleep :D. Unless a quick nap is actually a ruse to go and do some more soldering or designing.

You know that Exxos is actually Chuck Norris in disguise, right? Chuck Norris doesn't need sleep. Just a bit of nap now and then
:D

:lolbig: :bravo:

Icky wrote: 29 Nov 2018 08:34

exxos wrote: 29 Nov 2018 01:05 But first a quick nap...

You sleep? You have now shattered the illusion that you never sleep :D. Unless a quick nap is actually a ruse to go and do some more soldering or designing.

Never sleeping sounds about right. Having Thomas the tank engine theme tune in your head on loop for 5 days doesn't help.

My board is in the cooker.

One other possible thing to consider, is the datasheet says 47uF caps, the Falcon seems to use 220uF, But I used 10uF ceramics. ESR is godlike on ceramics, so shouldn't need as high of value.. but something to keep in mind I guess.

Will hack job this onto bread board and do some tests...

So this has turned into a epic of chaos..

Breadboard on its own, 5V is fine, no shorts... no shorts on the DAC board, plug them bother together it cooks the 5V regulator. So not sure whats going on there.. can only assume something is shorting out when the DAC board is plugged in... so gonna take some working out :roll:

So my small PSU has gone wonky again.. so back to my mega psu..

I tried the RED channel..

R2, R1, R0
000 = 1.68v
001 = 1.89v
010 = 2.10v
011 = 2.30v
100 = 2.51v
101 = 2.71v
110 = 2.92v
111 = 3.12v

So looks like 200mV each step.. which I assume is correct...