[SOLVED] Help needed for switch mode power adaptor

[aiubmehedi]

I have switching mode power adapter (rated 5v, 1A) for adsl modem. but its not working. i managed 5v from cell phone charger but current rating 650mA.
when i plugged the charger to modem on given polarity modem power led lit but not work. i think it needs 1A. how can i increase current (constant 1A) for cell phone charger? help needed

 

[RetroTechie]

how can i increase current (constant 1A) for cell phone charger? help needed

Either:

• You can't.
• You can't, safely.
• You can't, longterm (= expect it to die soon).

So a 650mA adapter is simply not up to the task to power a device 24/7 that may take 1A. Fix that modem's power adapter if it's easy & cheap to do so. If not, just get a replacement. 5V, >=1A adapter should be easy to find.

I just thought to measure the actual current consumption of that modem (perhaps it's much less than 1A), but realized that's not a good idea: it may draw little current when sitting idle, but draw much more when handling lots of traffic, evaluating firewall rules etc (if it's got built-in firewall function) so it's safer to go with the specs as found on the housing or in manual.

 

[D.A.(Tony)Stewart]

get extension cable from your computer spare Molex conector for DVD or HDD and insert >1A PTC in series. with connector adapter for your cell phone.. simple parts from Digikey. or use USB3 port 900mA @ 5V

 

[aiubmehedi]

thanks for the help.