Need help finding a cheap power supply for webcontrol

[firebladeRR1k]

I have seen reference to wall wart type power supplies that are being used successfully with the webcontrol. I know a bigger better lab power supply is preferred but I'm looking for a small form factor and very cheap solution. The webcontrol will be used for temperature monitoring on the one wire interface. Eventually I may have it control a few other sensors and or a set of relays. If i go with relays they will have their own power source.

Can anyone point me to a cheap power solution?

Thanks,
Chris

 

[rossw]

I have seen reference to wall wart type power supplies that are being used successfully with the webcontrol. I know a bigger better lab power supply is preferred but I'm looking for a small form factor and very cheap solution. The webcontrol will be used for temperature monitoring on the one wire interface. Eventually I may have it control a few other sensors and or a set of relays. If i go with relays they will have their own power source. Can anyone point me to a cheap power solution? Thanks, Chris

 
Check ebay. I bought 50, 9V/1A switchmode supplies for about $0.99 each, including shipping.
Cut the DC connector off, strip the outer back an inch, and you have red and black wires to connect to the WC directly.
 
I've had a couple of dozen running 24/7 like this for over a year. Had one power supply give up the ghost (but that may have been mains borne spikes)

 

[firebladeRR1k]

Is there anything specific I should look for? I used to have a power supply for the WC but accidentally got rid of it during Spring cleaning last year along with all spare wall warts. When finding that one I noticed a lot of wall warts did not output the advertised voltage. Do I want to look for a specific type? Btw, that price is perfect and would be great to find one to run the future 5v relays.

Thanks,
Chris

 

[rossw]

Is there anything specific I should look for? I used to have a power supply for the WC but accidentally got rid of it during Spring cleaning last year along with all spare wall warts. When finding that one I noticed a lot of wall warts did not output the advertised voltage. Do I want to look for a specific type? Btw, that price is perfect and would be great to find one to run the future 5v relays. Thanks, Chris

 
The webcontrol has onboard voltage regulator.
8 to 12V is fine. At 12V the board runs quite warm however, which is why I settled on 9V
The WC board draws under 1A, so a 1A or better supply is fine.
That's a pretty generous range of options. Switchmode supplies are small, light, cheap and efficient.
 
As for running your 5V relays - you will either need a second regulator, or power supply or hope they draw sufficiently low current that they won't send the WC regulator into shutdown (if you use the WC 5V supply).

 

[Tschmidt]

Can anyone point me to a cheap power solution? Thanks, Chris

 
I've used this 9V (and similar version) wall wort on my WC designs.
http://www.mpja.com/9VDC-10A-Wall-Supply-Kenwood/productinfo/19463%20PS/
 
As Rossw mentioned WC has an on-board 5V linear regulator. Using 9Vs is convenient, power supplies are cheap and voltage is high enough to power most 12v fans and relays directly. To minimize WC heating want to keep input voltage around 8 or 9 volts and not steal too much current. BTW WC has a series input protection diode so that will drop a volt or so, limiting how low you can go on the input.
 
/tom

 

[firebladeRR1k]

Thank you so much. Just got my WC back from firmware upgrade a day after receiving the power supply recommended from these posts. Works great!! Thanks for all the help.