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Thread: neatPLA. The best looking PLA for fixing your C64 :)

  1. #1
    plazma's Avatar
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    Default neatPLA. The best looking PLA for fixing your C64 :)

    I made a new version of dodgyPLA named as neatPLA. Now it got timings fixed and a cool looking PCB. Very well tested.

    You can choose low profile flat pins design compatible with leaf spring sockets OR round pin header design compatible with round pin sockets.

    The project is shared at github https://github.com/1c3d1v3r/neatPLA

    I sell these for 14€ per assembled unit. Hand soldered with love.

    DIY kit with loose parts & programmed CPLD 8€.

    Extra brand name DIL socket +1€.

    Shipping (Finland 1,70€, Europe 2,40€, others 3,60). PayPal fee 0,50€ or EU bank transfer.
    Limited 30pcs batch. Also on sale elsewhere.

    You can always order your own PCBs and components with the info available at github.

    Check my other sales posts:
    Joystick port ESD protector V1.1 http://www.amibay.com/showthread.php...protector-v1-1
    Joystick port ESD protector v2.0 http://www.amibay.com/showthread.php...ga-C128DCR-etc
    SRAM for C64 http://www.amibay.com/showthread.php...6-SRAM-for-C64
    Switchless JiffyDOS http://www.amibay.com/showthread.php...for-all-models


    Last edited by plazma; 12th June 2020 at 17:09. Reason: changed images

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    MCes's Avatar
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    My congratulations, I took a quick look, but this hardware project seems well developed and nicely assembled!
    The 3.6 V on-board regulator is interesting, a correct choice that respect the "Recommended operating conditions" of the CPLD and the needed compatibility...
    well done!

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    It's neat!

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    This looks nice, and just what I need

    Declaring interest in 1x unit - I'll take a low profile / leaf spring socket version.
    Please PM me with bank transfer details and total cost shipped to the UK.

    Cheers!
    Last edited by d0pefish; 1st May 2020 at 12:40.

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    mujo32's Avatar
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    Wow, just in time Interested in 1 unit, round pins. Shipping to Slovenia.
    Last edited by mujo32; 1st May 2020 at 15:26.

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    plazma's Avatar
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    Quote Originally Posted by MCes View Post
    My congratulations, I took a quick look, but this hardware project seems well developed and nicely assembled!
    The 3.6 V on-board regulator is interesting, a correct choice that respect the "Recommended operating conditions" of the CPLD and the needed compatibility...
    well done!
    Thanks for the compliments
    A proper regulator is way better than a series resistor and zener diode. That desing is temperature dependant.

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    eslapion's Avatar
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    Quote Originally Posted by plazma View Post
    The price of the CPLD chip jumped from 1$ to 7$.
    Are you sure ?

    https://lcsc.com/product-detail/CPLD...C_C124132.html

    Sidenote: LCSC is not one of those cheap eBay surplus seller, they sell genuine ICs only.

    A proper regulator is way better than a series resistor and zener diode. That design is temperature dependant.
    Well, a low voltage CPLD produces very little heat. Besides, if you are referring to PLAnkton, there is no Zener diode on it, only a standard small signal silicium one. To get a variation of 0.05 volt would require an increase in temperature of 40C. Although, I suspect I could replace it with a slightly better Schottky Metal-silicium one which has a better thermal coefficient.

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    plazma's Avatar
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    Previously I bought from Digikey and Mouser. The price used to be close to 1$. Now it's over 7.
    https://octopart.com/search?autosugg...vqg44c&specs=1

    I once bough two PLAnktons. I measured the voltage. IIRC it started around 3.6V but rose above 3.8V. I guess it was caused by the diode warming up.

  9. #9
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    Quote Originally Posted by plazma View Post
    Previously I bought from Digikey and Mouser. The price used to be close to 1$. Now it's over 7.
    https://octopart.com/search?autosugg...vqg44c&specs=1
    Yeah, they're gouging.

    I once bough two PLAnktons. I measured the voltage. IIRC it started around 3.6V but rose above 3.8V. I guess it was caused by the diode warming up.
    I would chance asking what power supply you're using. The normal voltage you should have with PLAnkton is about 3.7V but since I use a rather unorthodox voltage reducer, I extensively checked XC9536XL ICs at up to 4.3V to be sure.

    On both the C64 and C128, I noticed NMOS and HMOS ICs use less power when they warm up so the whole computer uses less power. As the load reduces, the voltage on the 5Vdc line increases a bit because of the voltage drop reduction in the cable between the PSU and the computer.

    I suggest you check the current load when you turn it on from cold vs when the computer has been left on for 30 minutes. The difference is significant.

    From your octopart search engine, I noticed Newark has a good price too. https://www.newark.com/xilinx/xc9536...536XL-10VQG44C
    Last edited by eslapion; 1st May 2020 at 19:37.

  10. #10
    plazma's Avatar
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    Quote Originally Posted by eslapion View Post
    From your octopart search engine, I noticed Newark has a good price too. https://www.newark.com/xilinx/xc9536...536XL-10VQG44C
    That's where I bought my last chips. Before that from Mouser close to 1$ and before that from Digikey.
    Last edited by plazma; 2nd May 2020 at 09:18.

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