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[APD] DIY jobs
Mariano F. Bonfante wrote:
> Local outlets has 220V 50Hz, so I am using a 60Vca (typical en CATV
> industry), galvanic insulation transformer for feeding the resistors. There
> is also a dimmer circuit, to allow two phases: day and night. Daytime
> permits the substrate to be 1ºC above the water, nigh phase just a bias
> I spent some time with these systems, but it is fun and I like it.
I'm a IT engineer, who was a electronic engineer, so I've often built my
own low powered heaters for small Aquariums.
I put the resistors in a test tube and fed them 18V DC @ 1.1A from a
basic regulated off the shelf DC power supply.
So no risk of electric shock or it failing like normal heaters.
It has as a side effect, a low electromagnetic field due to its use of
DC as oppose to using AC. Some say fish are sensitive to these fields.
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