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Thread: DSATX aux wiring- make the circuit make sense for me!

  1. #1
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    DSATX aux wiring- make the circuit make sense for me!

    I have a DSATX that I will be using for my car pc, and I'd like to use its aux turn on pins for the remote wire for my 5 channel amp. I know that it actually needs a circuit in order to make this work, but I'm clueless about wiring circuits. I'm expecting it to go from the pin-out of the DSATX to the remote turn on jack on my amp.

    In my travels on MP3 Search Bar, I located this pdf detailing how to make the circuit, which should be the first of the two on that pdf. I need a little hand holding to know what I need to purchase and precisely how I need to wire it.

    More specifically:

    I can buy a 2n3906 transistor from radio shack no problem. I'm not sure what wattage resistor I need, as 3 show upon my quick search of radio shack. Do I need 1/8, 1/4, or 1/2 watt? It will simply be a remote turn on for my amp.

    Once I have the correct resistor, will it be painfully obvious which way it needs to face on the wire? Does flipping it around due to naivety cause the circuit to work improperly?

    Do I need to fuse any wire at any point, and if so what size fuse would I be using? I have 4awg fused at the battery running to my amp, and 8awg fused at the battery running to my DSATX.

    Sorry if this is hum-drum boring, but I would prefer not wire things incorrectly. The only wiring I've done on my own so far was a zener diode to quiet down my cpu fan

    Thanks

  2. #2
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    Quote Originally Posted by TFCommanderBob View Post
    I have a DSATX that I will be using for my car pc
    hey, i used to have one of those!!(waiting for zootjeff to send me back a replacement after mine died--i miss my carpc)


    Quote Originally Posted by TFCommanderBob View Post
    I can buy a 2n3906 transistor from radio shack no problem. I'm not sure what wattage resistor I need, as 3 show upon my quick search of radio shack. Do I need 1/8, 1/4, or 1/2 watt? It will simply be a remote turn on for my amp.
    take your pick. technically, it doesn't really matter. i would go with 1/2watt just to be sure, but if the extra couple cents is too much, 1/8 watt is fine.

    Quote Originally Posted by TFCommanderBob View Post
    Once I have the correct resistor, will it be painfully obvious which way it needs to face on the wire? Does flipping it around due to naivety cause the circuit to work improperly?
    no, the resistor will work either way, as long as it is connected.


    the transistor on the other hand does need to be connected a certain way.

    in this pdf(i am only referring to this because the diagram is a little closer to the real device):

    http://www.fairchildsemi.com/ds/2N/2N3906.pdf

    looking at the "TO-92" or diagram on the left.

    the transistor has a flat side. in this diagram it is facing down, in the dsatx diagram, the flat spot is facing up.

    Quote Originally Posted by TFCommanderBob View Post
    Do I need to fuse any wire at any point, and if so what size fuse would I be using? I have 4awg fused at the battery running to my amp, and 8awg fused at the battery running to my DSATX.
    i did look into recommending some fuses, but all are well above the max rating of the circuit-- 0.1A, so it would not be easy to fuse.

    there are some 0.25A glass fuses at radio shack, and this holder might work, but remember, the max draw is 0.1A, and the fuse is 0.25A...

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    Thanks so much for your reply, you always seem to be the one to come to my rescue

    I'm going to stop by "the shack" after work to pick this stuff up and give it a try. After that It will be on to trying out the serial brainstem which I've seen tons of threads about, many with problems though

    I didn't think to ask what gauge wiring I would need to do this with, but I have some like 20 or 22awg around that would be appropriate, correct?

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    go with the 20 ga--preferably stranded wire.

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