Improving Timex/Sinclair Tape Loading

Discussions about Sinclair ZX80 and ZX81 Hardware
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1024MAK
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Re: Improving Timex/Sinclair Tape Loading

Post by 1024MAK » Fri Dec 08, 2017 12:31 pm

Lardo Boffin wrote:
Fri Dec 08, 2017 10:26 am
Excellent! Having had some experience of fixing tracks I have broken ( :oops: ) I suspect it will be no problem to sort. 8-)
I spy some very close together pads, so it would be a good idea to make sure that any that are not supposed to be connected, aren't actually connected.

And yes, soldering a piece of solid core wire over a break or crack on a new PCB is rather easier than overcoming track damage on an old densely packed commercial PCB. Clean the track and quickly and carefully "tin" it. Then where possible, either leave a component lead (like a resistor or capacitor) long and bend over, or use an off-cut of a component lead ;)

Mark

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Re: Improving Timex/Sinclair Tape Loading

Post by Lardo Boffin » Thu Dec 14, 2017 12:21 pm

Now to find the time to assemble it!

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Thanks sir morris!

Doubtless some questions to follow about polarity of components and which wire goes where...
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

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Dim_75
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Re: Improving Timex/Sinclair Tape Loading

Post by Dim_75 » Sun Dec 17, 2017 1:59 am

Great !!! :D If only i had enought time to do so.
Good work

Lardo Boffin
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Re: Improving Timex/Sinclair Tape Loading

Post by Lardo Boffin » Sat Dec 23, 2017 12:11 am

Where can I get a cheap switch from? The connectors on the ones I have are way too big to fit the small holes. :shock:
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

sirmorris
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Re: Improving Timex/Sinclair Tape Loading

Post by sirmorris » Sat Dec 23, 2017 7:28 am

I expected wire flying leads from the board to the switch as it was highly unlikely that the switch you had would have fitted the layout I had. This would also make putting the lil fella in a case easier as you would have free rein on the switch placement. You might consider putting the LED on wires too - for the same reason. Do you have any heat shrink tube?

Lardo Boffin
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Re: Improving Timex/Sinclair Tape Loading

Post by Lardo Boffin » Sat Dec 23, 2017 9:04 am

sirmorris wrote:
Sat Dec 23, 2017 7:28 am
I expected wire flying leads from the board to the switch as it was highly unlikely that the switch you had would have fitted the layout I had. This would also make putting the lil fella in a case easier as you would have free rein on the switch placement. You might consider putting the LED on wires too - for the same reason. Do you have any heat shrink tube?
That would make sense! :D I don’t have any heat shrink tube (or an appropriate source of heat) so will improv with normal insulated wire.

Just got to order two resistors and am ready to build. :shock:
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

Lardo Boffin
Posts: 859
Joined: Sat Nov 26, 2016 2:42 am

Re: Improving Timex/Sinclair Tape Loading

Post by Lardo Boffin » Wed Jan 03, 2018 7:26 pm

Finally got started! :roll:

3DE6371F-0412-49FC-AAD1-E42FB4ABED6F.jpeg
(577.7 KiB) Downloaded 390 times

Assuming the picture shows correctly orientated (layout to left and board to right):-

Does the IC go in notch upwards?
Does it matter which way the LED goes in (i.e. polarity before any aussie themed replies appear...)?
Which way does the diode go in? Stripe at the ‘top’?
Does the positive of the battery holder connect to the + on the reverse of the board?
Which part of the cassette cable connects to S and which to G? I assume the tip is S and the ‘sleeve’ is G.
I assume it doesn’t matter which way round the switch goes?
Do I need to do anything with GND?
Finally (!!!) what are the two holes for at the bottom of the board?

:D
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

Lardo Boffin
Posts: 859
Joined: Sat Nov 26, 2016 2:42 am

Re: Improving Timex/Sinclair Tape Loading

Post by Lardo Boffin » Sat Jan 06, 2018 10:54 pm

So some very necessary reading / learning later...

Yes an LED is polarised (light emitting DIODE). Clue was in the name I guess. It looks like the longer leg should be positive but it appears I can check this with the diode test setting of a multi-meter.

Looking at various wiring diagrams for mono plugs does suggest the tip is S and the jacket is G so I will go with that.
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

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TMAOne
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Re: Improving Timex/Sinclair Tape Loading

Post by TMAOne » Sun Jan 07, 2018 8:02 pm

That's a nice looking board you're working on Lardo--much better than my cobbled together effort. I'm excited for you.

You've answered most of your own questions. Refer to the circuit diagram for the rest, as "top" is somewhat arbitrary.

The stripe on the diode goes where the "line" is on the circuit diagram. (I think of the symbol as depicting an "arrow" hitting a "wall", showing the direction in which current can NOT flow.)

Looks like you're almost there,...
Ian

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1024MAK
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Re: Improving Timex/Sinclair Tape Loading

Post by 1024MAK » Mon Jan 08, 2018 5:41 pm

Diodes (and LEDs):-
Image
Image

Mark

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