Maker Pro
Maker Pro

Increasing the DC 5V 250 mA adopter volt & amp.

crazybuoy

Sep 19, 2010
13
Joined
Sep 19, 2010
Messages
13
I want transformerless power supply with 24V 2 Amp and I think any existing cell phone battery adopter can do it for me. I have an DC adopter (5V 250 mA) and want some changes in the circuit to get my desired volt & amp. You can review the circuit of any of your adopter, as most peoples has such a adopters.
You may also suggest any other circuit that can provides me transformerless power supply with DC 24V 2 Amp.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
The simple change is to go and buy a power supply rated 24V 2A.

If you want a DC-DC converter without a transformer, then this goes into the "how-to" of such a design.

A warning though, you'll probably need a 5V 15A power supply though, or 60 5V 250mA adapters. If you were going that way, it would be vastly more efficient to try to connect 40 of them up in a series/parallel configuration to get 25V at 2A (not saying that would work though -- any more than paralleling 60 of them).
 

crazybuoy

Sep 19, 2010
13
Joined
Sep 19, 2010
Messages
13
How about to use big resistor to drop the 220v AC to 24v AC then use bridge rectifier to convert it to DC?
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
Now you are being a crazy boy.

It's a bit like wanting a car and asking if you can tie a jumbo jet to a go-card and stuff old magazines in the engines to slow them down a bit.

Just go out and buy a 24V 2A power supply. You might find an old laptop power supply that will work. Most these days are around 18 to 20 volts and 3 to 5 amps, but some earlier ones were different voltages.
 

Militoy

Aug 24, 2010
180
Joined
Aug 24, 2010
Messages
180
....It's a bit like wanting a car and asking if you can tie a jumbo jet to a go-cart and stuff old magazines in the engines to slow them down a bit.
....

:D:D:D Perhaps 50-60 extension cords all strung together in series to drop the voltage???

"What Steve said" - There are dozens of 24 VDC adapters up on eBay, from around $10 up. You are probably not going to have much success trying to squeeze 50W out of your 1.25W adapter. Save yourself some grief and buy one.
 
Last edited:
Top