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Re: [APD] DIY jobs

That´s a very interesting point I have never considered. I will try to place 
a rectifier in the system.

Thanks for the info.


>From: Stuart Halliday <stuart at stuarthalliday_com>
>Reply-To: stuart at stuarthalliday_com,        aquatic plants digest 
><aquatic-plants at actwin_com>
>To: aquatic plants digest <aquatic-plants at actwin_com>
>Subject: [APD] DIY jobs
>Date: Mon, 05 Sep 2005 16:12:53 +0100
>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. 
> > 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
> > voltage.
> > 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.
>Stuart Halliday
>Aquatic-Plants mailing list
>Aquatic-Plants at actwin_com

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