Transformerless Power Suppply

[Melanie]

If you're still looking for components, attached PIC I've taken gives you an idea of what to look for... The 11V VDR is pretty small (VDR2 in this pic) - and also laying alongside with a view of a typical Capacitor you can use. If it's an X2 type you're OK, otherwise you'll have to fit one with a 400vDC rating. It's a real good idea to absolutely and positively mark the PCB that it's LIVE... even if it's just for yourself. Some time in the future you'll forget and it'll bite you.

[ERIK]

Thanks Mel, I have finally got some 275V X2 caps and some VDR's (I had to buy 100 of them but thats OK). So I'll sort out a PCB (well marked, and well housed) and let you know how it goes...

[sayzer]

Hi Melanie,

Going back to this post,

Would that be too much to ask for your complete fan controller schematic?
and, if possible, for the code also?

I am having a similar inquiry and would like to see your approach.
Or if there is anyone else who had a similar design.

Regards

[Melanie]

Hi Sayzer

This product is still in volume production (about 1000/month), and I'm treading on thin ice just posting the PCB view (a couple of posts above) and some snippets out of the PSU schematic - the remainder if you're clever you can figure from most of the components in use and eliminating those I've already revealed... a licence for the complete Software and Schematics would cost... I envisage around $5K.

Melanie

[sayzer]

May be, I can support that thin ice, so it will not crack.

Since you already have it in production, I may need not to work on it;

This is of course if you are able to sell it to other customers. Are you?

Should I PM to you?

[Melanie]

Sure, continue this by email, as I can then send you the product Datasheet so you can see if it fits your requirements.

[sayzer]

Upon the discussion with Melanie, attached is the capacitor value table for the current (mA) that your circuit draws.

Table is quite simple to figure out.

Table is for 110V@60Hz and 220V@50Hz.

Example: If your circuit draws 12mA, and your power line is 110V 60Hz, then, you use 0.289uF (290nF) for C2 in the circuit that Melanie posted here.

Of course you will have to adjust D2 and VDR accordingly.

If this table is any help to anyone!


Regards