amp sensor switch

inwo

Joined Nov 7, 2013
2,419
Ebay doesn't let you share much either.:(

That's why a $.99 Ebay sale might work. It also makes shipping easy for me.;)
I had to change the auction from free shipping or it might have sold.:D

Let me know if you want the part and I'll change it to free again.
 

Thread Starter

ozioho

Joined Jan 20, 2014
15
yes, I would like it. I was kind of confused on what was going on at first, but now I get it. I will check on ebay
 

inwo

Joined Nov 7, 2013
2,419
I'm sorry,

I just went to change listing to free and see that it ended.:(

I'm not on here all the time.
Just most of the time.
 

inwo

Joined Nov 7, 2013
2,419
I think I made a mistake in my drawing.:p
C1 was added to increase starting surge (if needed) to pull in current relay.
Or maybe I had some other crazy idea that I no longer see.:D

What ever, this makes more sense today.
 

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inwo

Joined Nov 7, 2013
2,419
In reference to email:
As others may be following, I'm posting here.................................

This is a very simple circuit, but it will need fine tuning for your exact motor load.
This picture is the same as the diagram I posted.

I don’t think I can simplify it more.

When connected thru your switch as shown:

Cut the neg. lead to motor and run current thru the large winding of the reed switch.
When the motor is running this current will form a magnet, closing the the circuit between the two small wires.

The motor is started by turning the switch on until motor starts.

The two small wires will keep the motor running after you turn the switch off as it is connected across the start switch.

If motor current drops, magnet weakens, and the contacts open inside the plastic tube (reed switch), stopping motor.
Until switch is pressed again.

The diode is needed to protect the switch as it’s only good for a few 100 mAs of current.
If your motor draws more it will destroy the switch inside.
 

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