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TomWhitwell / TuringMachine

Turing Machine Mk 2 Main Module
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Turing Machine mk I - random not working #138

Open MickGlossop opened 4 years ago

MickGlossop commented 4 years ago

Hi Tom - with the main knob in the centre position I'm not getting any randomisation. The TM behaves as if the knob is fully CCW (16 steps, or 32 with the switch UP), i.e. a constantly repeating series of CV voltages.

It's behaving as if the shift register is stuck. If I use the WRITE switch to clear the register, the CV output becomes constant as you would expect, but as soon as I release the WRITE switch, the CV output returns to the same sequence that was 'stuck' previously.

This behaviour is unaffected by un-plugging the backpack and Pluses/Voltages boards.

Where would you suggest I look - should I change a chip?

Cheers, Mick G.

MickGlossop commented 4 years ago

I've replaced both the 4015 chips and that seems to have solved the problem.

Thonk-Steve commented 4 years ago

Hi Mick,

Glad you solved it and sorry no one responded yet! Summer holidays aplenty at Thonk and Music Thing.

Regards

Steve

On Fri, Aug 7, 2020 at 7:13 PM MickGlossop notifications@github.com wrote:

I've replaced both the 4015 chips and that seems to have solved the problem.

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MickGlossop commented 4 years ago

No problem - we’re all entitled to some down time!

Cheers, Mick