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 » Thu Oct 26, 2017 4:00 pm

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.?
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...

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TMAOne
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Re: Improving Timex/Sinclair Tape Loading

Post by TMAOne » Thu Nov 02, 2017 5:54 am

Just wanting to keep the ball rolling here,...
gammaray wrote:
Thu Oct 26, 2017 4:00 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 4:00 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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Location: Texas

Re: Improving Timex/Sinclair Tape Loading

Post by gammaray » Mon Nov 13, 2017 12:49 am

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 5:04 pm, edited 1 time in total.
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...

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Paul
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Re: Improving Timex/Sinclair Tape Loading

Post by Paul » Mon Nov 13, 2017 5:23 am

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 » Mon Nov 20, 2017 12:11 am

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 24 times
Dim_75 wrote:
Mon Oct 09, 2017 1:11 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? :?
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...

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