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12V AC adapter to 5V

Discussion in 'General Electronics Discussion' started by bubbagump00, Oct 23, 2010.

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  1. bubbagump00

    bubbagump00

    8
    0
    May 24, 2010
    Hi, I am building my own digital photo frame. I am using a Haier 7" LCD TV for the screen, which requires a 12V input, and the SanDisk Digital Photo Viewer (SDV2-A-A30), which requires only 5V of power. I understand I could possibly use a 5V regulator, but I don't know where to insert that into the circuit, or if I would possibly need a diode or heatsink or anything for it.

    Essentially, I'm connecting the digital photo viewer to the 7" LCD screen, but I only want to use one AC power adapter for both parts. All suggestions are welcome. Thanks!
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Does the LCD TV really require 12V AC? (That rectifies into at least 15V DC btw.) Will you aquire that PSU separately yourself? How much power does the Sandisk need?
    Anyway, you might need to use a switchmode regulator to take that voltage down to 5V without too much heat loss.
    I believe you could use a ready-made car cigarette USB power adapter for that task.
     
  3. bubbagump00

    bubbagump00

    8
    0
    May 24, 2010
    Well the TV says it requires 9-12V but the adapter says it has an output of 12V, 1500mA. I can't find the power consumption of the Sandisk photo album, but the adapter for that says 5V DC output with 1000mA. The adapters both came with the products.
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Ok, it seems we're talking about 12V DC, and the Sandisk may require as much as 5W (which amounts to 500mA when converted from 12V).
    So the question now is; how much does the TV draw?
     
  5. bean

    bean

    4
    0
    Oct 21, 2010
    Try one module called VMP3201, it can convert input voltage from 5.0V-24.0V to 1.0V-9.0V. Hope it is helpful.
     
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