dino-new Posted January 4, 2004 Posted January 4, 2004 I performed a relay volt mod. I'm using a relay to trigger the volt mod on and off on my 9800 pro card, here's some pics... The relay... The activation switch and LED... The problem is that it tweaks the vid card if I try and engage it while the computer is running. I thought perhaps this is due to a signal bounce created by the relay. My question is what can I do about this? I thought perhaps I should short each side of the relay output using a CAP, but I'm unsure what CAP to use and what rating in farad? Any electro guru's out there know what I should use? TIA, Devin Quote Share this post Link to post Share on other sites More sharing options...
Eva_Unit_0 Posted January 4, 2004 Posted January 4, 2004 WOW, that's really cool. Do you think the problem is simply the jolt of higher voltage hitting the card, and that's why is has problems while the comp is running? Quote Share this post Link to post Share on other sites More sharing options...
Iggy Posted January 4, 2004 Posted January 4, 2004 All I can say is SWEET! B) Quote Share this post Link to post Share on other sites More sharing options...
Mist Posted January 4, 2004 Posted January 4, 2004 Cool I don't see the jolt being a prob because I can up the volts to my cpu in windows and it doesnt affect it like that. Quote Share this post Link to post Share on other sites More sharing options...
dino-new Posted January 4, 2004 Posted January 4, 2004 Thanks for the ups! Yeah I think it's causing an oscillation in the feedback loop. Since the voltmod just modifies the feedback loop of the voltage regulator. But I'm not sure how to dampen the oscillation. I thought about soldering a cap from the hot pin of the volt mod to the ground to dampen it, but I'm worried about bypassing the 10k variable resister as doing that could create dangerously high voltage spikes from the regulator. Any ideas? Quote Share this post Link to post Share on other sites More sharing options...
CoolBlue Posted January 4, 2004 Posted January 4, 2004 Thanks for the ups! Yeah I think it's causing an oscillation in the feedback loop. Since the voltmod just modifies the feedback loop of the voltage regulator. But I'm not sure how to dampen the oscillation. I thought about soldering a cap from the hot pin of the volt mod to the ground to dampen it, but I'm worried about bypassing the 10k variable resister as doing that could create dangerously high voltage spikes from the regulator. Any ideas? ::thinks back to high school electronics class:: can you monitor the voltage in windows (or whatever os you use) and watch, so if you hit the button you can see it spike? the way i rememeber is that if you are using a computer you cant simply up the voltage while it is running. if you oc your cpu you up the voltage in bios and restart, call me on this if im wrong but when you hit the button while the computer is running doesnt that supply the vid card with more voltage immediately? if so then thats probally your problem. im no expert by far but i hope this helps Quote Share this post Link to post Share on other sites More sharing options...
dino-new Posted January 4, 2004 Posted January 4, 2004 With the voltmod on the vid card you can be running a program like 3dmark and get artifacts because the speed is too high for the voltage. Then you simply increase the voltage while it is running by turning the potentiometer up while you monitor the voltage with the multimeter so you don't go too high. Keep turning (while whithin a safe voltage threshold) until the artifacts dissapear. That method works for me. That said, the way I see it it's one of two things. Either the voltage increase is too rapid or an oscillation is occuring in the feedback loop and causing problems. But I'm not sure which. Both fixes would require adding a cap to the circuit. Thanks, Devin Quote Share this post Link to post Share on other sites More sharing options...
Eva_Unit_0 Posted January 5, 2004 Posted January 5, 2004 If you think it's the voltage spike coming too quick, you could put a potentiometer in series with the button, so when you hit the button to activate the circuit you could then bring the voltage up slowly. Quote Share this post Link to post Share on other sites More sharing options...
dino-new Posted January 5, 2004 Posted January 5, 2004 Yea I was talking to Player0 over at Liquidninjas and he gave me a good idea that goes along those lines. Add a diode and a large capacitor to the coil side of the relay so that it gets the voltage slow and without any bounce back. I'll try it and let you guys know how it works. Thanks again, Devin Quote Share this post Link to post Share on other sites More sharing options...
InvaderTrax Posted January 5, 2004 Posted January 5, 2004 Looks like one of those Turbo buttons you see on older computers Quote Share this post Link to post Share on other sites More sharing options...
dino-new Posted January 6, 2004 Posted January 6, 2004 Yes like a turbo button. That way you hit the nitrous only when the race starts. So I don't fry the card from using too much nitrous for too long. Here's our latest design, it's a little rough but coming along none the less... Devin Quote Share this post Link to post Share on other sites More sharing options...
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