Hi,

If it's the same kind of electronic halogen lighting transformer as sold
overhere, you can not load these with anything other than a pure resistive
bulb. This is because the bulb is actually part of the resonant and/or self
oscillating mechanism of the power supply. Loading it with something
capacitive like a bridgerectifier-capacitor combination may result in
spurious power supply behaviour. Actually, I've seen some blew up when
experimenting with different load types.

The dedicated designs of these electronic transformers are mostly just
sufficient enough to power a light bulb and to meet certain standards with
regard to safety and EMC. Do not expect any good power supply performance
from these.

Daniel...

----- Original Message -----
From: "Tal Bejerano - AMC" <kooter@ZAHAV.NET.IL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, December 28, 2001 11:05 AM
Subject: Re: [EE]: is it really DC?


> Hi Peter
>
> Are you sure about that I cannot regulate the 12v?
> the transformer output on the pcb look like not connected to any device
> neither resistor or capacitor for current feedback.
> or maybe the feedback is on the primary coil?
> if I draw it's circuit, should it help you see if I can use it? it's very
> simple circuit some capacitors and resistors and 2 transistors.
>
> Thanks
>
> Tal
>
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On
> Behalf Of Peter L. Peres
> Sent: Friday, December 28, 2001 9:11 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: is it really DC?
>
>
> You can't use that transformer as you want, it only works with a normal
> bulb (halogen or not), or other resistive load. This is because it uses
> current feedback and a saturable core transformer.
>
> The output is insulated at least in theory, because halogen fixtures are
> not rated for mains voltage. Check for compliance marks (EC/GS/TUV etc).
> However you get to use this only at your own risk ;-).
>
> Peter
>
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