Aaron's Homepage Forum
Aaron's Homepage Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 Electronics
 Power Supply
 current limiter		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

catprog
New Member

2 Posts
Posted - Aug 24 2009 :  06:11:43 AM  Show Profile  Reply with Quote
I have an air pump that is powered by a 250ma 12V AC transformer. The input on the back of the pump is 12V 50-60hz 2w.

I believe it works by using the alternating current to turn on and off an electromagnet.

I wish to power it from a DC source.

My idea is a square wave generator to a mosfet connected to a 250ma current limiter.

My problem is I need to find a way to limit current draw to 250ma.
Edited by - catprog on Aug 24 2009 06:13:47 AM

audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 24 2009 :  09:44:24 AM  Show Profile  Reply with Quote
The pump draws (2W/12V) 167mA from 12VAC. If you feed it a 50Hz or 60Hz sine-wave that is 12VAC RMS then it will draw only 167mA. A square-wave is different and might break the pump.
Go to Top of Page

catprog
New Member

2 Posts
Posted - Aug 24 2009 :  10:19:34 AM  Show Profile  Reply with Quote
the pump is constructed by 2 levers of fulcrem,membrane of the pump, magnet. (double output pump)

there is a U shaped magnet (with the U ends outside the lever magnets) inside is another magnet surrounded by what appears to be a coil with the end of wire going to the plug pack.

oh and the DC source is a 5w soalr panel.

what kind of circuit to power it if a square wave is not a good idea?
Edited by - catprog on Aug 24 2009 10:20:19 AM
Go to Top of Page

audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 24 2009 :  6:27:09 PM  Show Profile  Reply with Quote
There are about 5 common sine-wave generator circuits.
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
Aaron's Homepage Forum © 1995-2020 AARONCAKE.NET Go To Top Of Page
This page was generated in 0.06 seconds. Snitz Forums 2000