Improving Timex/Sinclair Tape Loading

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

Post by gammaray »

Once this works, we should have a list and file share of all the tapes we rescued using it. :)

Ok maybe I should contribute and make the kits. If given a parts list I can order and bag the kits? From the U.S.?
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
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TMAOne
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Re: Improving Timex/Sinclair Tape Loading

Post by TMAOne »

Just wanting to keep the ball rolling here,...
gammaray wrote: Thu Oct 26, 2017 5:00 pm If given a parts list I can order and bag the kits?
There is a parts list in the original article .pdf file.

How "complete" would we want the kits to be? In my own case, I have things like resistors, battery holders, and switches already in my junk box, so I don't know if I'd want a kit or just the circuit board to populate myself.

From just a quick look on eBay.ca, the monolithic caps (4 identical) can be had from China at 100 units for an American dollar. The ICs are similarly 10 for a dollar. 4148 diodes are of course ubiquitous and cheap. The 100PF silver mica capacitors are a little more dear at unit prices, but cheaper in quantity.

For someone (gammaray?) to effectively price the parts for complete kits, he'd have to have a rough idea of how many units we are expecting to want. I've heard commitments for maybe 10. Am I too low? Opinions?

Another small side point if I may on the connectors. I had suggested the possibility of female sockets so one could use their existing double male cables if one wished. I sort of take it back--in my opinion it's better to avoid multiple connection points whenever possible.

I would order two 3' double-male cables from eBay for about $3 each, cut them in half, and solder them to the circuit board to keep make/break connections to a minimum. The Scrubber-Dubber would then plug directly into the two tape machines and ZX81.

Then again, I'm so paranoid of the brutally cheap sockets on the ZX81/TS1000 that I've done the same thing to virtually all my motherboards to start with. My Zeddys are octopuses. That's why my Scrubber-Dubber's ZX81 line terminates with a female connector. :lol:
gammaray wrote: Thu Oct 26, 2017 5:00 pm Once this works, we should have a list and file share of all the tapes we rescued using it. :)
Absolutely!
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gammaray
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Re: Improving Timex/Sinclair Tape Loading

Post by gammaray »

Personal preference but maybe the board could be laid out for EITHER the pigtail or a female socket? Let the assembler decide?

Hmmm?

Charles
Once the female sockets are on the PCB there is no one keeping you from soldering wires there instead.
So your feature will be there automatically.
Maybe I misunderstood the direction the design was taking... I'll sit back on my couch now and wait for another opportunity to embarrass myself. :?
Last edited by gammaray on Mon Nov 13, 2017 6:04 pm, edited 1 time in total.
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
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Paul
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Re: Improving Timex/Sinclair Tape Loading

Post by Paul »

Once the female sockets are on the PCB there is no one keeping you from soldering wires there instead.
So your feature will be there automatically.
In theory, there is no difference between theory and practice. But, in practice, there is.
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gammaray
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Re: Improving Timex/Sinclair Tape Loading

Post by gammaray »

Could the following have something to do with it? I downloaded and took a look. I am a KICAD novice too.
POWER FLAGS.png
POWER FLAGS.png (51.2 KiB) Viewed 4001 times
Dim_75 wrote: Mon Oct 09, 2017 2:11 am Well i tryed to make something with KiCad as my try with Eagle was not productive.

After some hours i was able to do the schematic as it seems to be necessery before makink any drawing of the pcb, but... it still have some errors when i try to validate the schematics.
Here i still have 3 errors (the green arrows) :
3 Debugging errors.JPG

I put the KiCad projet files in the zip :ZX-CleanLoad.zip

As it is the first time i use this kind of programm i may have forget something or misunderstood the manual.
Any of you familiar with KiCad can have a look ?
On the other hand IC1C looks superfluous? I have not researched the circuit thoroughly. Is it suppose to be a unity follower or buffer? :?

For you KICAD users, is the following layout correct?
Attachments
ZX-CleanLoad V.05.zip
(8.48 KiB) Downloaded 216 times
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
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gammaray
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Re: Improving Timex/Sinclair Tape Loading

Post by gammaray »

Did we need to send money or be patient or take some helpful action?
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
sirmorris
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Re: Improving Timex/Sinclair Tape Loading

Post by sirmorris »

Patience would be appreciated :)
sirmorris
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Re: Improving Timex/Sinclair Tape Loading

Post by sirmorris »

But in the meantime, here are the eagle files I've worked on so far, also the schematic in pdf format if people want to check it against the original in the magazine.
dubber.png
(19.82 KiB) Downloaded 349 times
dubber.pdf
(51.91 KiB) Downloaded 198 times
Attachments
dubber.zip
(48.59 KiB) Downloaded 182 times
sirmorris
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Re: Improving Timex/Sinclair Tape Loading

Post by sirmorris »

Not my finest hour but I think it will work as a proof of concept. This is now trimmed, drilled and on its way to a certain Boffin.
IMG_4284.jpg
(3.34 MiB) Downloaded 332 times
I had some issues with my laminator, it was sticking, and consequently I've got a couple of broken traces but these have been highlighted and are easy to fix in the soldering.

If this works it's a trivial step into ordering boards. I won't be making any myself but I'm happy to shepherd the board house process if that would help people.
Lardo Boffin
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Re: Improving Timex/Sinclair Tape Loading

Post by Lardo Boffin »

Excellent! Having had some experience of fixing tracks I have broken ( :oops: ) I suspect it will be no problem to sort. 8-)
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TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
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