23 May 2022, 08:20 | #521 |
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@Stedy
@PurpleMelbourne Great job guys, will follow it |
24 May 2022, 19:50 | #522 |
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@PurpleMelbourne
Please don't forget the bootselector |
02 June 2022, 22:34 | #523 | |
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Quote:
I had a go at doing one myself but it didn't go too well, I think the DL portion is okay (180ns delay between 0-5.5mhz) but anything colour related looked wavy and there were horizontal scrolling lines slowly going up the screen. I don't know if it was noise or what, I used shielded inductors but I assumed the legs for mounting it were acting as antennas for noise and then just gave up, although it may be that I needed bigger ground connections. I tried using the force (and rf-tools.com ) but sometimes you just need expertise in electrical engineering I guess. Aside from that I'm basically burned out. I have A600 2B done but I'd like a 2D board to do a replica of one of those. A1200 2B finished but I'm waiting on AOTL keyboards to be available to try that and that's been going on for 2 years. CD32 because what the hell about 75% finished just missing some routing and silkscreen (which looks like a PITA due to space). A600 in A1200 form factor finished aside from silkscreen but who knows if that will work. I just find Kicad way more fun than spending money and building boards unfortunately. |
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03 June 2022, 21:11 | #524 |
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I actually have some of these (and the DSP56001 variant) in PGA packages and also considering slapping one of these on my designs. What interface method are you planning to use?
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03 June 2022, 23:16 | #525 |
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13 August 2022, 16:32 | #526 |
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19 August 2022, 21:55 | #527 | |
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Quote:
I've stripped an a600 rev 2d pcb down in the meantime, scanned it in at high res and done a near replica with thermal reliefs and a couple of fixes (C26 and U33pin 10 aren't connected to VCC like they should be). Cd32 finished too. Last edited by Mick; 19 August 2022 at 22:04. |
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24 September 2022, 11:22 | #528 |
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Maybe interested in the 2d replica, as it would be a good base to add some tweaks and extra features too. Would like to keep it as near to original as possible though. Is that one going to get a release?
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01 September 2023, 17:50 | #529 |
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hi is there a bom and were all the part should go on the a600 as i would love to do one for my system but dont want to get the wrong restistor on the board. is there link or download for the list of parts and were they go
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01 September 2023, 18:55 | #530 |
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01 September 2023, 21:59 | #531 | |
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Quote:
In the absence of Z221/Z222 replacement parts I've come to the conclusion that installing a CXA1645 or similar is easy enough in a stock board by just putting the capacitor/resistor they need in creative places if you don't need the RF modulator, if you do need the RF modulator then I'm not sure what impact it will have not having the audio buffer for mono out (CXA1145 exclusive feature). Even a CD32 rev 4 should be easy enough to get working without Z221/Z222 if you use a Rohm BH7236 which retains the C-Sync pass-through. |
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05 September 2023, 09:24 | #532 |
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ok will answer my own question i found how to create the bom from schematic Editor
so am now happy on doing my first board when i order the pcb is there anyone in the uk have the pcb as i only want 1 lol, not 5 from pcbway but if not then i will order 5 so there may be 3/4 left after i done mine |
05 September 2023, 11:06 | #533 | |
French in Australia
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Quote:
A1200 in A600 form factor would be fun. |
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05 September 2023, 14:24 | #534 | |
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Quote:
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06 September 2023, 21:01 | #535 |
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thanks for that i used jlcpcb a lot for my joystick pcb project so happy to order from them. used there editor (easyeda) a lot more then Kicad.
yes i had got the bom so pricing up the stuff i need and i have two old broken a600 as well for me been able to check if i done right. but thought i ask if any one in the uk had a spare board i would buy from them, but if no then ok i will order and if someone else like a pcb i may have spares lol any way thanks Last edited by trident; 07 September 2023 at 08:13. |
10 December 2023, 16:40 | #536 |
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I tried to order some A600 boards from PCBWay a bit back with a view to hopefully (once tested) selling some to help fund A1200 2B etc but for some reason they were adding £100-200 on top of the estimate, when I asked why they just said the system is not always accurate so I don't know what's going on there. I was still waiting for a Kipper2K keyboard from AOTL so never even did a A1200 for myself so that's not tested either.
I basically got carried away doing "other" stuff more recently which has helped me to practice copper fills better which means A600 is also improved, whereas before I just had a single copper slapped over the whole board which is a bit messy I guess. I have to reiterate KiCad is more fun than most PS5 games these days, it's also even easier now you add a scan as background in KiCad 7, spending money on pcb's/parts and soldering not so much unfortunately. I feel like I'm letting people down but yeah not really completed anything unlike chucky whose brought about 10 boards to completion. |
10 December 2023, 20:34 | #537 |
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I find PCBWay quite expensive on times, have a look on JLCPcb as well, I've used them for a few big boards and they all have been good so far.
I quite enjoy soldering but some of the surface mount parts on there could be a challange |
11 December 2023, 15:23 | #538 | |
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Quote:
Not only that but the quality your receive from PCBWay is beyond dreadful. We got a lot of completely defective boards from them, they literally had shorted traces in random spots. Go with JLCPCB, at least you will get consistent quality. |
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24 February 2024, 11:45 | #539 |
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I'm hoping to start doing something in the next month or two. It's just a case of overcoming the feeling of dread.
I'm thinking of doing MD2 first though as I've spent the most time on that and it should be easier and cheaper and I've actually made some improvements (while trying to keep it as original as possible): General > Modified some of the footprints for currently available parts (ie. d-subs, heatsink, power/reset buttons) > Added solder jumpers for region and PAL/NTSC selection. > Added an IC for the power on reset circuit instead of using the op amp as a comparator. > I've implemented AVCC and VVCC properly, that is to say the VCC for audio and video components is fenced off behind an LC filter as was intended before what I presume was rampant cost cutting. Video > Added a capacitor to pin 9 of the encoder for CXA1645 support. > Added two smaller bypass capacitors at each of the encoders VCC inputs as per datasheets. Audio > Added 75 ohm resistors to 32X inputs (missing on VA0 for some reason), from what I gather they're to reduce noise. > Added footprints for a clean reference voltage near to the op amps instead of taking the noisy output from the RGB encoder. > Removed the passive low pass filter on MCD output and added capacitors to mixing stage instead. I think that's everything. I've been playing around with an old board and just replacing the op amps with something decent and giving them a clean VREF improves sound dramatically. |
25 February 2024, 19:30 | #540 |
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Go for very fast OPAMP - it should reduce distortions due Paula PWM volume control - typical OPAMP's are usually too slow to properly deal with 3.58MHz high level signals - personally i have plan to use buffers as I/V converter.
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