Thread: Zx81
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Old 10th Mar 2020, 6:52 pm   #12
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 8,625
Default Re: Zx81

John doesn't have a scope as far as I know, just a meter.

Addendum for John: If you measure the output voltage from a power supply like this with no load, ie, not plugged into the ZX81, the output voltage will be much higher than the voltage (9V?) which is marked on it, possibly as high as 12 to 14 volts. That is normal for these old fashioned unregulated power supplies.

We're assuming the power supply is the original Sinclair supplied item with the 'Sinclair' logo embossed on it.

Agree, an image of the problem would maybe help us to narrow things down.
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