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    need help power supply

    Are they separate boxes, or a dual unit in the same box? What is the connection to the load like? Are you using the PS is series or parallel? Please provide more information. There is not enough here to answer the question.
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    motion sensor power supply problem

    I looked at the datasheet for this product on the manufacturers website. They didn't show any good information, but you can try contacting them directly with the question. I don't see any transformers in the pictures, but do see what looks like a full bridge rectifier. Although I find it hard to...
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    i need help of this Relay circuit.

    My bad, I must have skipped over that last line. Sorry.
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    turnsignal and brakes

    In America we have something you may not have heard of up North. It's called personal freedom. If you live within the law, you get to have some fun. Incandesent bulbs are primitive. There are NEW cars sold in America using LED blinkers from the factory. School buses and big rig trucks use them...
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    Adjustable Voltage Reg LM317, Should it be getting this hot ?

    OK, you got me on that one AudioGuru. I should have reviewed the datasheet before posting, rather than relying on memory that has faded.
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    LCD panel that can be see through

    All LCD panels allow light through when they are in the off state. The shinny part you see inside is either a reflector (only reflects light) or a transflector (both reflects and still allows some light, transmissive). The real problem is getting the LCD to completely block the light, and to be...
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    Digital Dash - help please

    It's not going to be simple. You need a way to convert the analog signals (voltages) to digital. You can use a series of comparators to drive each LED as the thresholds get tripped. This is kind of a brute force approach, but isn't complicated. A better solution might be to use a...
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    turnsignal and brakes

    OK, I get it. Just run the ones you want to light with the left blinker from that circuit. You can't connect them all together and then selectively turn them on. Use current limiting resistors so they don't burn up as soon as they are activated. If you used LED's less than about 3500...
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    dc to ac help

    Yes the 555 has a squareware output. But you can integrate this over a cap and get a psuedo signwave. Use that to drive a descrete transistor switching the DC. You will have to play with it, but it's doable.
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    Is this a ceramic cap?

    It's a ceramic dipped monolythic capacitors. Or yes for short.
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    Adjustable Voltage Reg LM317, Should it be getting this hot ?

    And not all LM317's are created equally. The LM317T has thermal shut down.
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    i need help of this Relay circuit.

    The last reply is partially correct in that the lines horizontally mean the contacts move together. The original question was not this. The lines you are asking about indicate that the contacts are activated by the coil that the dashed lines are pointing at. This is very common in schematics...
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    Batteries In A Series

    Parallel the batteries to increase capacity (life), then use a boost regulator to get the 3V up to 3.7V. Since most boost regulator circuits have a very wide input range this will keep working as the batteries drain. Look up BOOST regulators (these are DC to DC regulators) and you'll see plenty...
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    CHIP Resistance code value help

    The problem you are having is not reading the value correctly, it's the measurements you are taking. You didn't mention removing the parts, so I assume they are still soldered into the circuit. That becomes an in-circuit measurement. You would have to account for what the rest of the circuit is...
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    mini audio amp 12VDC between Zumo 450 GPS and ear phones.

    Just about any general purpose OPAMP will do fine. Try an LM324, not great for sound quality but who cares in this case. Look it up on the web and you'll find plenty of circuit diagrams to build from. I used to make them like this as guitar practice headphone amplifiers.
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    LED turn

    If all you want is to slowly turn the LED on, a simple RC is all that you need. The extra parts are NOT needed. Assuming your circuit can supply at least 20mA. Are you talking about an indicator for something in your car? Plenty of current capacity already.. I see a lot of replies on this forum...
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