hi all, i want to build this circuit, but don't want to use the power supply indicated on the attached schematic. can someone come up with a 0-100vdc p/s i can use instead? also, where to attach it? thanks.
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The schematic you attached generates the 10V-100V supply, depending on the switch setting. To make your own supply, the normal way would be to use a SMPS IC and wire up something similar to that in the schematic. Alternately, you could get the microcontroller to drive a transistor/inductor/diode and regulate the supply.
If you didn't find what you wanted in the SMPS design page above, what are you after?
Well, technically it's a coupled inductor, but it is a custom part.
What info is given about T1 in the article? I can imagine it being a very simple item to build. Take core X and add two windings. Once the materials have been gathered, it'd take only a few minutes to wind by hand.
The schematic seems to be showing it going to 100V. The split inductor allows a higher voltage than the MC34063 could handle on its switch/collector pin.
If you want to just use an off-the-shelf inductor, you'll want to use an external switch (FET/BJT transistor) that can handle the 100V. You can drive it with the MC34063 shown in the schematic, or use a different IC, e.g. UC3843.
From some photos I've found, the inductor is just a pot core around 25 - 30mm diameter (based on the proportions of that relative to the LCD bezel).
They are very easy to wind and use, just count the turns on to the bobbin as you wind it then put the ferrite half cores around it. I've used dozens of them in various projects over the years.
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Ideally you should find a parts list (or buy a copy of the original article) that gives the correct core material or type number, as there are several variations in each size, with different magnetic properties.
Using the correct, original transformer parts is by far the easiest way of getting that circuit to work - and it does explicitly say in numerous places that the test voltage goes up to 100V with that design.
A ferrite toroid core may work as an alternative, but without knowing the material type of the original core I would not have a clue what to suggest..
Yep, but there are various grades of ferrite with different magnetic properties relating to inductance and suitable for different frequencies. Also, the cores are made with different air gaps, which drastically change the inductance per turn of the winding.
And only has 60 turns, wind yourself a transformer using a ferrite pot core - you really need a transformer to make the 100V, and that circuit looks excellent.