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Thread: converting 12VDC to 5 and 6VDC

  1. #1
    Low Bitrate ketchup318's Avatar
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    converting 12VDC to 5 and 6VDC

    how do you do this? I need to power a SB Audigy and Hauppauge WinTV. I've tried power regulators, but have only found 1 amp ones. I tried this and it doesn't convert enough power (not to mention it heats up quite a bit) The reason i want to do this is so i can stay off my opus' power, don't want to overburden it.

    i thought about getting an inverter and just plugging the things in, but doing that seems cumbersome. i want to convert the 12VDC to 5 and 6VDC and connect it straight to the devices.

    any info would be great, thanks.
    AMD 1700 & Abit VA-10 w/ 512Mb PC3200 Corsair Ram
    60GB 7200rpm HD - Opus 150W PS - Lilliput 7" TS
    Panasonic Slot DVD - SD Audigy NX 2
    Phoenix Gold 5.1 MT Amp - 2 USB Hubs
    Hauppauge WinTv USB2 - Holux GPS - Belkin Bluetooth

  2. #2
    Raw Wave rando's Avatar
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    Search the forums for several threads about TI ISR modules. The PT6625 is a fully assembled switch mode buck regulator that can deliver upto 5A @ 5V without the massive heat production characteristic of linear regulators like the 7805 and LM1084. The modules are expensive (~$20) but it doesn't take too many blown 7805s or adjustable 317T modules at Ratshack prices to get to $20. You might also convince TI to send you a sample.

  3. #3
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    Don't use any liner power regulators (like LM1084, 7805) they have only --- : more corrent, more heat, more noises (from car generator). Take switching regulator: monolite assembled like rando said, or schemes based on L296, LM2576. And connect TV-tuner via diode to isolate sound card from tuner noises.

  4. #4
    Low Bitrate ketchup318's Avatar
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    cool i'll try the switching regulators... i have a tried a couple of the linear ones, 7805 (5V) and 7806 (6V) with the TO220 cases... those things get hot... i mean like burn my finger and get a blister... hot.

    oh and sergeykor, what do you mean connect the tv-tuner via a diode? you mean from for +6V source? thanks
    AMD 1700 & Abit VA-10 w/ 512Mb PC3200 Corsair Ram
    60GB 7200rpm HD - Opus 150W PS - Lilliput 7" TS
    Panasonic Slot DVD - SD Audigy NX 2
    Phoenix Gold 5.1 MT Amp - 2 USB Hubs
    Hauppauge WinTv USB2 - Holux GPS - Belkin Bluetooth

  5. #5
    Low Bitrate ketchup318's Avatar
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    hey rando, just a quick question, how do you connect the 14 pins of the PT6625? i'd figure it's just V(in) V(out) and GND... what about the others?
    AMD 1700 & Abit VA-10 w/ 512Mb PC3200 Corsair Ram
    60GB 7200rpm HD - Opus 150W PS - Lilliput 7" TS
    Panasonic Slot DVD - SD Audigy NX 2
    Phoenix Gold 5.1 MT Amp - 2 USB Hubs
    Hauppauge WinTv USB2 - Holux GPS - Belkin Bluetooth

  6. #6
    Raw Wave rando's Avatar
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    @ketchup318: Check the data sheet. There are 3 or 4 each of GND, Vin and Vout. Then there is an adjustment pin that lets you move the output voltage around a bit, a turn-on/off pin, and feedback pin to improve regulation at the load and maybe another 1 or 2 in there I don't recall. Search the forums. The TI ISRs have been used by a few people and discussed extensively several times before.

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