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  1. B

    Air Compressor Controller

    Phase rotation contacts will be n/o (should be drawn as such) until correct rotation is achieved. Control circuits are drawn, no power. Circuit does not take into account (due to shortcoming of info on equipment used) the 110v transformer and associated controls. i.e. it was mentioned the...
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    Isolated Grounds

    Depends what u3 is. Maybe it needs it, maybe it doesn't.
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    Air Compressor Controller

    Fair enough. I'd tend to call that a condensate drain valve but different countries.....different names...:) So I take it then the pressure switch has a mechanical dump valve on the compressor head? It's usually seen as a small tube running from the bottom of the pressure switch to a flap valve...
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    Air Compressor Controller

    Yes, I've seen the need with Tecumseh in RAC systems but not air compressors. No problem though, just another contact. Some phase rotation relays will even include undervoltage protection.
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    Need to know about this part

    Ok...thanks Circuit attached.
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    Air Compressor Controller

    Unusual to have a dump valve electrically controlled. I'm assuming this is to dump head pressure at shut off to allow the compressor to re-start with zero head pressure. Don't really see the need for phase rotation monitor unless the unit is portable.
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    Need to know about this part

    Did anyone read #9?
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    Charging an iPod from 12V in a car

    Must be millions of 12 to 5 volt auto converters out there in Ebay. Plug into the aux power socket in the dash( previously the cigarette lighter socket) Already provided with a usb socket.
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    Can I Connect Same Speakers To 3 Players?

    Get whomever is building your switching device to incorporate the relays as well.
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    Rotating tv help

    Buy an additional remote for the other room.
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    Can I Connect Same Speakers To 3 Players?

    Since you have 12v available, perhaps use relays to switch between amps. Whatever operates/switches individual amps on could switch that set of relays also.
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    Rotating tv help

    Can you try to be a bit more specific as your details make no sense.
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    Need to know about this part

    I did a Google on SP2822 and came up with the following. There is a circuit at the bottom showing the chip in a similar configuration with a 10v dc drive if that helps. So I'm guessing transformer around 7vac output. http://yaplog.jp/kazuikazui/archive/233 Your board looks like it has copped a...
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    Polarity diagrams:

    . Logically it does to me....
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    Building a 1 kW automotive voltage regulator

    Most car alternators these days run at around 80A so I don't see any problem getting one there.
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    Power Relay needed

    I hope the penny drops for the Op soon Bob.o_O
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    Motor Discussion

    An r/c servo does all that.
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    Push Button H2O - Reversing Polarity

    Just about anywhere. Electronics store, ebay maybe. Pic below...they are a small switch with a set of changeover contacts. Wire as per diagram and you should be ok. Ebay have 10 for $2.00. Normally have anywhere between 2 and 10 amp rating. Ones shown are 5A...
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    Push Button H2O - Reversing Polarity

    Easy...if he uses the r/c tx and rx with a servo, traverse to one end closes one of a pair of micro switches, traverse to the other closes the other micro switch. In the centre, neither is operated. Micro switches set up exactly the same as for reversing a dc motor.
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    Push Button H2O - Reversing Polarity

    Don't know what you mean "polarity issue". Do you have a tx/rx? Don't know why you need 2 channels but most come with 4 or 5 for about $30 anyhow. Do you have a receiver controlled switch also or were you referring to the radio when you say you have one.
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