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Thread: Commodore 64 PSU replacement/upgrade board (rebuild kit)

  1. #1
    Commodork anemo's Avatar
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    Default Commodore 64 PSU replacement/upgrade board (rebuild kit)


    Commodore 64 PSU replacement/upgrade board (rebuild kit) v1.2

    TL;DR: Rebuild your original C64 PSU (power supply unit) with modern and reliable technology instead of buying a "saver" or new PSU.

    Availability: 0 board(s)









    The stock C64 PSU is infamous for damaging/destroying your computer when the PSU fails. The PSU consists of mainly two parts;
    1) the iron core transformer which outputs 9V AC
    2) the linear regulator board which transforms 9V AC to 5V DC

    The second part is the weak link and can cause a too high output voltage. The original construction is ineffective, unreliable and produces quite a lot of heat (nice for warming you feet though). Keep the good part and replace the bad one!


    These assembled and tested boards are a modern replacement/upgrade with switched and filtered voltage regulation (9V AC to 5V DC) instead of linear regulation. The need for a so called "saver" is minimized/eliminated and you can keep on using your original Commodore PSU. The board fits the beige wedge shaped PSU variant; Part No. 902503-06, Part No. 902503-11 and eventually more. Works with 110/230V and 50/60 Hz transformers.

    Output voltage WITH filter: 4.95-5.05V* (@1A)
    Output voltage WITHOUT filter: 5.0-5.1V (@1A)
    Output current: 2A MAX
    Efficiency: ~90% (original board: <50%)
    Size: 50x70x27mm (WxDxH)
    Built with high quality parts from Nichicon, Aimtec, Samsung and more
    Overcurrent protection
    Overheating protection
    Short circuit protection
    1x 220 ohm resistor included for power LED option

    *There is a ~0.05V voltage drop at 1A current draw across the output filter. The filter can be bypassed by closing the solder bridge.

    Changelog:

    v1.2:
    * 2x 3300uF smoothing capacitors (v1.0: single 4700uF)
    * Filter/choke coil with only 0.05v voltage drop@1A (v1.0: 0.1v@1A)
    * Power LED option – place for resistor and cables/header on board (v1.0: N/A)
    * Filter bypass solder bridge (v1.0 N/A)

    The installation requires:
    1) Opening the PSU (more or less force is needed as parts are glued together)
    2) Removing the original PCB and installing the the new PCB (soldering)

    ALWAYS measure and verify correct output voltage and polarity BEFORE connecting the upgraded PSU to your C64.

    Price: €28 each including untracked international shipping
    Payment as gift to PayPal

    The PSU boards are also sold elsewhere.

    Thanks for looking!
    Last edited by anemo; 17th March 2019 at 20:22.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    I am mildly interested, however I feel there need to be holes in the PCB for the ac9V in and dc5V out (mechanical protection).

    Update.

    The 1st pic shows holes in the boards, and the others have pad connections. I think we need clarity on what is for sale. Also I think you need to extend the 5V wires too (looking at the highres images)
    Last edited by mrr19121970; 17th February 2019 at 09:04.
    See www.amibay.com/entry.php?176-My-Offerings
    Speed up the transaction ?? PayPal.me/mrr19121970 as family'n'friends and PM me with what you want and where to send it.

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    Quote Originally Posted by mrr19121970 View Post
    I am mildly interested, however I feel there need to be holes in the PCB for the ac9V in and dc5V out (mechanical protection).

    Update.

    The 1st pic shows holes in the boards, and the others have pad connections. I think we need clarity on what is for sale. Also I think you need to extend the 5V wires too (looking at the highres images)
    Thanks for your feedback! Yes, there are hole for the cables/wires in ALL boards (as seen in first and last picture) but in my case they were a little too short and I chosed to solder the wires directly to the pads (with holes) on the board.

    Concering the clarity of whats on sale I'm not sure what you mean. The description states that it is the board for the 9V AC to 5V DC regulation. The requirements for replacing it successfully is also mentioned:

    "The installation requires:
    1) Opening the PSU (more or less force is needed as parts are glued together)
    2) Removing the original PCB and installing the the new PCB (soldering)

    ALWAYS measure and verify correct output voltage and polarity BEFORE connecting the upgraded PSU to your C64."
    Last edited by anemo; 18th February 2019 at 08:26.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    Since there was some confusion from mrr19121970 and no reply to my previous answer I post this picture to clarify the construction of the board:



    The cables/wires can be a) soldered through the holes OR b) soldered directly to the pads.

    Availability: 3 boards left
    Last edited by anemo; 19th February 2019 at 12:55.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    mrr19121970's Avatar
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    I have paid
    See www.amibay.com/entry.php?176-My-Offerings
    Speed up the transaction ?? PayPal.me/mrr19121970 as family'n'friends and PM me with what you want and where to send it.

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    Quote Originally Posted by mrr19121970 View Post
    I have paid
    Payment received. Will ship tomorrow.
    EDIT: package shipped.

    Availability: 2 boards left
    Last edited by anemo; 20th February 2019 at 06:47.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    One board sold elsewhere.

    Availability: 1 board left
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    Interested in one board, PM on the way!

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    Quote Originally Posted by el_pasi View Post
    Interested in one board, PM on the way!
    PM replied with payment info.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

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    Payment sent.

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