ZX81 cooling fan

Discussions about Sinclair ZX80 and ZX81 Hardware
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sirmorris
Posts: 2664
Joined: Thu May 08, 2008 4:45 pm
Location: oxon, uk

Re: ZX81 cooling fan

Post by sirmorris » Tue Nov 14, 2017 9:52 pm

ZXpunkawallah :lol: :lol: :lol:
--=== ZXpand+ ... A more moderner all-in-one upgrade solution for ZX81 ===--
* SD/MMC storage * 32K Hires-capable RAM * AY sound chip * Joystick port * Serial *
* BASIC enhancements - plug & play * Reset button * Auto-boot facility *

Moggy
Posts: 1505
Joined: Wed Jun 18, 2008 1:00 pm

Re: ZX81 cooling fan

Post by Moggy » Tue Nov 14, 2017 10:06 pm

sirmorris wrote:
Tue Nov 14, 2017 9:52 pm
ZXpunkawallah :lol: :lol: :lol:
Have you been at the cooking sherry again Charles!!? :lol:

@Lardo

There's a fan here that might be worth having if only for its performance in restricted spaces and at this price worth a punt I would have thought.

https://www.maplin.co.uk/p/evercool-30m ... -fan-a27gu

Lardo Boffin
Posts: 623
Joined: Sat Nov 26, 2016 1:42 am

Re: ZX81 cooling fan

Post by Lardo Boffin » Tue Nov 14, 2017 10:34 pm

Thanks Moggy. I will get one ordered.

Edit - bloody Maplin. None in my local branch and you can’t order them on line. Nearest one is 20 miles away!
I’m sure this used to be a good company.... :evil:
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

Moggy
Posts: 1505
Joined: Wed Jun 18, 2008 1:00 pm

Re: ZX81 cooling fan

Post by Moggy » Wed Nov 15, 2017 1:14 pm

Lardo Boffin wrote:
Tue Nov 14, 2017 10:34 pm
Thanks Moggy. I will get one ordered.

Edit - bloody Maplin. None in my local branch and you can’t order them on line. Nearest one is 20 miles away!
I’m sure this used to be a good company.... :evil:
Will continue the search.

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gammaray
Posts: 250
Joined: Sun Apr 17, 2016 1:44 am
Location: Texas

Re: ZX81 cooling fan

Post by gammaray » Wed Nov 15, 2017 5:59 pm

Moggy wrote:
Tue Nov 14, 2017 10:06 pm
sirmorris wrote:
Tue Nov 14, 2017 9:52 pm
ZXpunkawallah :lol: :lol: :lol:
Have you been at the cooking sherry again Charles!!? :lol:

@Lardo

There's a fan here that might be worth having if only for its performance in restricted spaces and at this price worth a punt I would have thought.

https://www.maplin.co.uk/p/evercool-30m ... -fan-a27gu
Are you making a mini ZX81 robot :shock: HOVERCRAFT?
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND, ZeddyNET, ZXBlast..., unfinished Spectrum...

Lardo Boffin
Posts: 623
Joined: Sat Nov 26, 2016 1:42 am

Re: ZX81 cooling fan

Post by Lardo Boffin » Wed Nov 15, 2017 7:10 pm

Moggy wrote:
Wed Nov 15, 2017 1:14 pm
Lardo Boffin wrote:
Tue Nov 14, 2017 10:34 pm
Thanks Moggy. I will get one ordered.

Edit - bloody Maplin. None in my local branch and you can’t order them on line. Nearest one is 20 miles away!
I’m sure this used to be a good company.... :evil:
Will continue the search.
Thanks Moggy!
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

Moggy
Posts: 1505
Joined: Wed Jun 18, 2008 1:00 pm

Re: ZX81 cooling fan

Post by Moggy » Wed Nov 15, 2017 8:11 pm

Well apart from China-bay cheap and cheerfuls I found these at RS components...

http://uk.rs-online.com/web/c/hvac-fans ... 4294885616

The second one down priced at £4.38 looks reasonable although there others to choose from different voltages and so on.

I forgot to mention that the fan I used has a 40 x 40mm frame size with 10mm depth, which fits snugly whilst leaving bags of room and personally would not consider anything smaller.

My method was to run a 12v fan off 5v which remains very quiet yet adequate from a flow point of view.
For any future modding rather than try cutting a square hole i would just use a hole saw of the type pictured which should make the opening more than adequate and also mount the fan to the right of the slats which I would blank off in some fashion. I would also make a vent on the vertical front edge of the top case more or less in line with ULA which should allow a better airflow over the chip seeing as the expansion aperture will be semi closed off once a peripheral is attached.

NOTE:
This mod was used on a zeddy with a switching regulator not a standard regulator and heat-sink setup.
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