Homebrew PCBs

Hello mumin,

If you are not too afraid of opening the Aquarium heaters, you can 
modify them to do higher temperatures.

I just modified one to go till 45 degrees C, but it during testing it 
also did 50 degrees, and probably more.

I just bought the cheapest one in the shop, called AquaEL, in my case 
100 W.

They work using a bi-metal element, which will bend more when heated, 
and thus acting like a relay. Adjust the distance to the contact, and 
it will switch on higher temperatures. They are just set on a fixed 
range.

However, some will be easier to adjust / open up then others,
so there is no quarantee with all makes.

Best bet is with older rubber closed tops, which can be easier opened.

Gertjan

--- In Homebrew_PCBs@yahoogroups.com, "mumin55555" <MUMIN55555@H...> 
wrote:
> HALLO!
> 
> im want to buy a water heater for the etching tank i am building.
> my problem is: no aquarioum heater thermostat goes more then 34 
> degrees c, while i need about 60 i think- for ammounium 
phersulphate.
> what can i do?
> 
> thanks a lot
> mumin