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Type: Posts; User: persivore; Keyword(s):

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  1. Replies
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    1,565

    If you can find SSR's in the same footprint as...

    If you can find SSR's in the same footprint as mechanical relays it will be as easy as just swapping the parts, otherwise it will mean a new PCB design for the relay/power board.

    Most of the...
  2. Replies
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    1,565

    I'll be using mechanical relays - They should...

    I'll be using mechanical relays - They should cope better with abuse switching inductive loads. Thanks for the info about the interference problem - I'll add in some supression across the relay...
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    1,565

    I'm going to put in programmable temperature...

    I'm going to put in programmable temperature thresholds to turn on multiple stages depending on HX temperature. Some basic hysteretic evap temp regulation would be possible, but I don't expect...
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    1,565

    Thanks for the feedback everyone - it looks like...

    Thanks for the feedback everyone - it looks like there's enough interest, so I've started on the design.

    I've attached some first drafts of circuit diagrams which I still need to check properly...
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    1,565

    Phase controller - initial planning

    I've been thinking about designing an open source phase controller for the community for a while, and I've finally got some time free to put a design together. All software, firmware and hardware...
  6. Thread: borked 480

    by persivore
    Replies
    25
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    4,378

    I'm doubtful that the capacitor mod was directly...

    I'm doubtful that the capacitor mod was directly responsible for the problem - The ESR and ESL of typical electrolytic capacitors should be high enough to prevent most problems. It might be possible...
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    6,182

    Farnell carry a number of 100MHz crystal...

    Farnell carry a number of 100MHz crystal oscillators (or at least they do in the UK (http://uk.farnell.com/jsp/search/browse.jsp?N=500006+1002264&Ntk=gensearch_001&Ntt=100MHz+oscillator&Ntx=)....
  8. Replies
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    That looks fine. I've just used a variable...

    That looks fine. I've just used a variable resistor between +3.3v and FBRTN in the past.

    There is usually a capacitor in parallel with the resistor between FBRTN and ground, which looks like what...
  9. Replies
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    15,924

    I've used this method to overcome OVP on a number...

    I've used this method to overcome OVP on a number of boards (commando's, P5B vanilla's, P5K's) with no problems. I wouldn't expect there to be any problem as long as the voltage between GND and FBRTN...
  10. Replies
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    15,924

    The problem limiting the voltage on the ADP3198...

    The problem limiting the voltage on the ADP3198 is not the current limit set by ILIMIT pin 11, it is the over-voltage protection generated internally in the device by comparing the Vcore (sensed on...
  11. The OVP and VR_RDY pins are only logic level...

    The OVP and VR_RDY pins are only logic level outputs to indicate the status of the voltage regulator, and shouldn't have any effect on the OVP threshold. The OVP threshold is derived by comparing...
  12. I think you would be much better using low value...

    I think you would be much better using low value (~100nf) distributed capacitance in high load areas to catch spikes and high frequency noise than addling large ammounts of bulk capacitance to the...
  13. Thread: Extreme PSU

    by persivore
    Replies
    7
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    5,340

    It looks like it should work ok. After...

    It looks like it should work ok. After rectification and smothing you should have a DC voltage of around 15v, which will need to be regulated down to 12v. If you go with linear regulation, you will...
  14. Replies
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    1,149

    It should work for both DC fans and PWM...

    It should work for both DC fans and PWM controlled fans. The diode is needed even more so if PWM control is being used tho.
  15. Replies
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    1,149

    It helps to stop damage to the transistor from...

    It helps to stop damage to the transistor from the back EMF generated at power off if the load is inductive :).
  16. Replies
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    1,149

    This should do what you need. The output voltage...

    This should do what you need. The output voltage across the fan will be around 0.7v less than the input, and the maximum output voltage will be around 10.5 to 11v. It should be able to cope with at...
  17. Replies
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    1,255

    Try soldering the capacitor directly to the board...

    Try soldering the capacitor directly to the board if possible. Connecting it to the board via long lengths of wire will negate the effectiveness of the capacitor by effectively putting an inductance...
  18. Replies
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    1,375

    Are the any missing inductors on the card? If...

    Are the any missing inductors on the card? If there are, try checking for +12v there :)
  19. Replies
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    3,056

    On some cards I've worked with in the past, the...

    On some cards I've worked with in the past, the RAM voltage supplies are turned on after the card has turned on. Its possible that there is nothing wrong with the memory voltage supply, and there is...
  20. The values of the resistors that would need to be...

    The values of the resistors that would need to be penciled are much too low a value for penciling them to give any sort of beneficial voltage increase :(
  21. Replies
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    14,662

    I can't check because the board is packaged up...

    I can't check because the board is packaged up ready to send back to its owner tomorrow, but I'm pretty sure it will be the ADP3228. I can't see Asus using different chips/board layouts on the...
  22. Replies
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    14,662

    Yea, its for the P5E3 Deluxe. I didn't check the...

    Yea, its for the P5E3 Deluxe. I didn't check the writing on the Vcore regulator, but I assume its ADP3228.


    The top red point connected to the capacitor is ground and the bottom red point...
  23. Replies
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    14,662

    I've attached some photos showing Vcore, Vdroop,...

    I've attached some photos showing Vcore, Vdroop, Vdimm and Vmch mods. Hope they help :)
  24. The RAM would probably have taken close to 5v if...

    The RAM would probably have taken close to 5v if the variable resistor was at zero ohms.
    Its possible that the voltage regulator might have shut down from OVP tho, in which case the RAM would have...
  25. Replies
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    4,410

    For the Vdroop mod, pencil across the 2 yellow...

    For the Vdroop mod, pencil across the 2 yellow points on the capacitor I've marked :)
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