Is it possible & relatively easy to change the power input on the ZX81 to use a Spectrum PSU?
Thanks,
Shaun
Replacing ZX81 power input
Re: Replacing ZX81 power input
The ZX81 pcb isn't ready to take a different input.
So an adapter cable is the best way to get a spectrum psu to work with the ZX81.
Be aware the spectrum plug is quite common and in 99% it's polarity is inverted. So there is possible danger of destroying your ZX81.
A simple diode that is capable of 2A load should prevent this. Or a full rectifier. Then you can use spectrum and other 7-14V power sources without any harm for your Zeddy.
Kind regards Paul
So an adapter cable is the best way to get a spectrum psu to work with the ZX81.
Be aware the spectrum plug is quite common and in 99% it's polarity is inverted. So there is possible danger of destroying your ZX81.
A simple diode that is capable of 2A load should prevent this. Or a full rectifier. Then you can use spectrum and other 7-14V power sources without any harm for your Zeddy.
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
Re: Replacing ZX81 power input
Thanks Paul.
Is there a suitable replacement for a ZX81 power supply that I may purchase?
Regards,
Shaun
Is there a suitable replacement for a ZX81 power supply that I may purchase?
Regards,
Shaun
Re: Replacing ZX81 power input
There are plenty.
E. G. https://www.amazon.de/gp/aw/d/B002TQ220 ... th=1&psc=1
Put it on 7,5V and plug in the 3.5mm Jack (TIP Is plus)
Kind regards Paul
E. G. https://www.amazon.de/gp/aw/d/B002TQ220 ... th=1&psc=1
Put it on 7,5V and plug in the 3.5mm Jack (TIP Is plus)
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
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Re: Replacing ZX81 power input
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
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ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
Re: Replacing ZX81 power input
A power supply from an old Atari 2600 VCS game console has always worked well for my TS1000 (the US version of the ZX81). Careful if you buy a 3rd party supply. You'll want to have at least 700 mAmps and not all of the 3rd party ones supply that amount.