Autor Wątek: Opus Discovery  (Przeczytany 32460 razy)

Klaud

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Odp: Opus Discovery
« Odpowiedź #360 dnia: 2020.06.29, 09:16:55 »
Buongiorno Claudio,

I hope Maryjan is fine and he will respond to your enquiry soon.
KL
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Odp: Opus Discovery
« Odpowiedź #361 dnia: 2020.06.29, 10:17:26 »
Thanks Klaud,

I look forward to its news

Have a good day

Claudio

Maryjan

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Odp: Opus Discovery
« Odpowiedź #362 dnia: 2020.06.29, 12:39:27 »
Hi, I'm still live :)

I am sorry that I did not write back, but lately I have been quite busy with professional matters.
Unfortunately, at the moment I don't have any pcb of my Opus Discovery clone.

Creating it, I did not think that it would gain such popularity.

I ordered a few more pcb of this project in China, but I can't answer when they get to me.
If something changes, I will write from you.
When creating this clone, I did not stick rigidly to the dimensions of the original Opus pcb box.
Therefore, additional modifications may be needed to mount in the original housing.

Regards Claudio




"... podobno są dwie szkoły, Falenicka i Otwocka."

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Odp: Opus Discovery
« Odpowiedź #363 dnia: 2020.06.29, 14:44:46 »
Thanks Maryjan, I'm glad you're okay.

I will wait for the pcb from China to arrive to complete my clone.
If you can, please reserve one for me, and let me know how to pay for it.
In the meantime, I begin to look for the components for the supply section, which is new and I can't recover from my old pcb.
Don't worry about the measures, my old Opus has not been in the metal case for a long time, I will design a new case.
I wait for your news, thank you again

Claudio

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Odp: Opus Discovery
« Odpowiedź #364 dnia: 2020.07.24, 12:03:26 »
Hello everyone!
Is there any news for the PCB?
Thank you

Claudio

Maryjan

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Odp: Opus Discovery
« Odpowiedź #365 dnia: 2020.07.24, 14:15:02 »
Hi :)
The PCBs are at customs for now.
I am waiting and I hope they will be with me next week :)

"... podobno są dwie szkoły, Falenicka i Otwocka."

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Odp: Opus Discovery
« Odpowiedź #366 dnia: 2020.07.24, 14:36:23 »
Great Maryjan,
I have nearly completed the collection of all the components!

Claudio

Maryjan

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Odp: Opus Discovery
« Odpowiedź #367 dnia: 2020.07.28, 20:06:57 »
Hello mr Claudio :)

I already have a pcb for the Opus Discovery clone.
Please contact me at [email protected] to finalize it.

Regards.
"... podobno są dwie szkoły, Falenicka i Otwocka."

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Odp: Opus Discovery
« Odpowiedź #368 dnia: 2020.08.02, 22:51:25 »
Hi Marijian,
I was comparing the BOM I found in this forum, with the interactive BOM you sent me and there are some differences:
- L1 is 33uH on the forum BOM, while iBOM marks 68uH
- Q1 is indicated as 2N3609 while iBOM reports BC557
- D5 is not in my BOM, while it is indicated as a Bridge rectifier
- F1, finally, is indicated by 1.5A while iBOM reports 1A
Can these components still be considered valid for the scheme?
I have seen the datasheet of the U18 (LM2596S-5) and the standard scheme uses a proper L1 of 33uH.
I would be grateful if you could give me some explanation.
Thank you

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Klaud

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Odp: Opus Discovery
« Odpowiedź #369 dnia: 2020.08.03, 07:38:55 »
Regarding LM2596S-5, the inductor value depends on two factors: power supply voltage and maximum load current. See below.
KL
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Maryjan

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Odp: Opus Discovery
« Odpowiedź #370 dnia: 2020.08.03, 11:24:21 »
I experimented a lot with the values ​​of these elements.
As Klaud wrote, the value of the choke is selected depending on the above-mentioned parameters.
Below is the final BOM for version 1.0 Discovery Clone.

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Odp: Opus Discovery
« Odpowiedź #371 dnia: 2020.08.03, 23:56:40 »
Thanks to both Klaud and Marijan for the quick answers, I understand and I will change the value of L1 to 68uH.
Does the bridge rectifier have the function of protecting the circuit if it happens to reverse polarity?
Thanks again

Claudio

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Odp: Opus Discovery
« Odpowiedź #372 dnia: 2020.08.12, 08:15:33 »
Ok, now the game gets tough!

It works!!!  :-)

Thanks to everyone who helped me recreate the Opus Discovery!

Claudio

Klaud

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Odp: Opus Discovery
« Odpowiedź #373 dnia: 2020.08.12, 08:29:22 »
Congratulations and have a fun.
KL
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Odp: Opus Discovery
« Odpowiedź #374 dnia: 2020.08.13, 17:02:58 »
Dear friends, I need your help!
Yesterday I connected the floppy drive to my Opus clone, but I had some malfunction.
I' using a Mitshubishi MF535 720K drive (I used with my original Opus too)
For now I have connected only one drive and therefore I have only one data cable and one power supply cable connected.
When I turn it on I get the regular QuickDos icon but as I try to give a simple CAT 1 command the response from Opus is unpredictable, and almost always ends with a reset.
Sometimes drive spi-up, sometimes no. The drive led might be on forever or (like it should be9<only when drive spin-up. Sometimes the drive led never shut down...

Some info about my setup.
- I'm using a 27C64 Eprom with QuickDos taken from the original Opus I have.
- I have set the two jumpers for ROM selection, all to GND connection (is it right?).
- I tried different combinations of the AB / BA jumper; it seems to me that one or the other must be closed (pin 2 of MC6821 to pin 1 of U15 or pin 3 of MC6821 to pin 5 of U15).
- My board have a WD 1770, thaken from the original Opus, instead a WD1772.
- I use the 128K (grey) power supply of the Spectrum at 9v.
- Drive is set as DS0 (I tried also DS1 but also impredictable response appened).

Something is wrong, but how can I test and what check to solve the problem?
Can you give me a safe setup of AB/BA pins and ROM selection, and alo for DS0/1 of the drive?
Maybe let me know if there are any measurements I can take to test the individual sections of the circuit.

Thank you, I await your comments

Claudio