Nov 08,2018
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  • Hi. Do you have the pinout for the cable connector. Its not on the BOM. Thanks

    Tor-Eirik Bakke Lunde 2023-11-15 22:56:06Reply

    It's shown in the schematic, more specifically here: https://github.com/tebl/C64-Power-Saver/blob/master/export/C64%20Power%20Saver.pdf

    Reply
  • Hi I have assembled 2 pcb but they don't work. When I plug the psu in the green led turn on but when I plug it in to the computer the led turns of and the relay clicks frantically. I have tried 2 different psu's and checked the voltages both before and after the power saver and it is totally normal. Any ideas what is wrong?

    Tor-Eirik Bakke Lunde 2023-10-06 20:27:10Reply

    It is hard to tell just from your descript_ion, but I think you may have used wrong values for one or more components (in particular the zener diode is something many get wrong, either direction or value). I recommend hooking it up to an adjustable power supply module, that way you can start at a low voltage and turn it up gradually to see where it flips out.

    Engineer 2023-10-11 19:42:26Reply

    I got the pcb's and parts from another guy who has built many of them. So I am almost certain that the components are right. The weird thing is that the relay only flips out when I apply a load to it like when I plug the computer in. But not when I apply a voltage to it.

    Reply
  • Tor-Eirik Is it easy to lower the voltage when the powersaver kicks in , the one i built kicks in at 5.67 and i rather have it kick in on 5.4 or even less. I guess it will be as simple as replacing a resistor (I mean I HOPE it is as simple as :) Thanks for sharing the design

    Eddie van Loon 2021-03-31 18:09:29Reply

    found an answer to my own question , change the value of R2 In my case : 470R = 5.65 V 560R = 5.50 V 610R = 5.45 V 680R = 5.40 V This is in my situation , i tried als 1 M that dropped the treshold to 5.1 or so , that is not really useable. Please measure before and after replacing the R2 with a different value !!

    Tamás Varga 2023-02-22 02:21:24Reply

    I tried to change the R2 to 680Ohm. In this case, when i plug the saver into the C plus 4, there is no picture, but turns the machine on, and the voltage is dropping to 4.1V (this is less to operate the machine). If i use the original 470Ohm for R2, then, without any load (it is not plugged into the machine yet), the red led is on and the buzzer is loud :) So, i do not know, where is the issue...

    Reply
  • Hello, Did not you think about/is it possible to use FET instead of relay ? BR and thank you !

    Tor-Eirik Bakke Lunde 2023-01-28 07:54:11Reply

    I built it as a straight conversion of Ray Carlsens design, just adapting for the parts that I had on hand and what I deemed easy to install and cheap to obtain. For a FET-based design, I recommend that you look at the C64 Saver from bwack (https://github.com/bwack/C64-Saver-bwack).

    Tamás Varga 2023-01-28 14:40:28Reply

    Thank you for the answer. Both your project and the one you linked seem promising; this time i ordered this one here, i'm waiting for the PCB atm....

    Reply
  • You can purchase the box design I made for the cartridge from the address below. https://cults3d.com/en/3d-model/game/commodore-64-powersaver

    Reply
  • Hello again, Apart from my previous question regarding regarding size of the fuse holder, I have a couple more questions for you: Firstly. Can this power saver also be used on the Vic 20? And finally, after reading the comments from the previous poster (Bram) I'm a little confused. The board I will get from PCBway will be the REV C board? And this still needs the single jumper as described on your Github page? From what I understand Bram had to install two jumpers to get the REV D to work, hopefully this is not the case with the REV C? I'm only a little paranoid as I have been asked to order and build a number of units, a couple for myself and 3 or 4 for some friends. I want to be sure I get things right the first time. Thanks again for your help and support.

    Tor-Eirik Bakke Lunde 2020-01-26 01:04:11Reply

    Revision E already have these fixes in place though I've not been very good at updating this page for some time, but I did it now so after the updated page is approved by PCBway (in a day or so) you should see the new version (it'll say revision E in the title). If you do not wish to wait you can also grab the gerber-files directly from my github at https://github.com/tebl/C64-Power-Saver.

    Reply
  • Hi...can someone tell me the size on the fuse holder I need? 5x20mm or 6x30mm? Thanks

    Reply
  • Hello my friend, thank you for sharing this! I am very happy to be able to protect my precious C64 from the evil powersupply! ;-) May I ask some questions? This item shows revision C. I found (do not remember where) rev D of your design. Is rev D very different from rev C? And the 4 spots where the 4-wire cable is soldered to connect to the C-64, I assume 2 are 9v AC en 2 are 5v DC, but how is the exact pin-out ? best regards, Bram.

    Tor-Eirik Bakke Lunde 2019-08-01 04:25:46Reply

    Revision D was probably directly from the github repository, it has not been tested by me though the changes were mostly moving around some tracks in order to get everything just right. It has come to my attention that some C64 power supplies had 5v on a different pin, this needed a wire on the board - added a notice to the description and updated the repository.

    Tor-Eirik Bakke Lunde 2019-08-01 21:02:27Reply

    Built a few of the revision D and they should be fine, just needs the extra 5v wire. Checked it out in details and it appears that what I did was reorder the boards to get more of them, but with rev. D on the silkscreen to separate them though no significant changes had been made to them other than cosmetics.

    Reply
  • Hi, it's me again. I have already found out where to connect 5V DC and 9V AC. However, something seems to be wrong in rev D. I did not messure any output after connecting the saver to the powersupply. I had to lay 2 bridges to get it to work. Pls see pic. Anyway: still a very great design and my saver works like a charm. Thanks again for sharing your project!!

    Tor-Eirik Bakke Lunde 2019-08-01 04:28:00Reply

    Thank you, as previously commented I've not tested the revision D design and therefore it is not as a shared project. As some wires were simply moved around, I assume the ground plane was disturbed on the second wire. The second one I added to the repository and added a note so that it can be made to work with all surviving power supplies.

    Reply
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