power supply

[peter g]

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.

 

[Lightium]

https://www.mouser.com/c/passive-components/emi-filters-emi-suppression/ferrites/ferrite-toroids-ferrite-rings/

Never mind that, I looked at the prices and...

https://www.digikey.com/en/products/filter/ferrite-cores/936

 

[Nigel Goodwin]

where does one get a ferrite pot core?

From the local ferrite drug dealer

But more seriously, what does the article specify? - they usually give exact details of the core and how to wind it.

 

[peter g]

i'am going to attach the article.

 

[peter g]

here is the complete article. this author does not give part numbers of the components to build project.

 

[Nigel Goodwin]

It does specify a 26mm pot core, so anything around that size should be fine - actual 'type' will make very little difference.

Here's an example from a quick google:

Transformer Pot Core - Pair | Jaycar UK Site

FERRITE POT CORE [LF1062] OD=25MM

www.jaycar.co.uk

Bobbin to Suit Pot Core LF1060 | Jaycar UK Site

BOBBIN POT CORE [LF1060] ID=13MM

www.jaycar.co.uk

 

[rjenkinsgb]

here is the complete article. this author does not give part numbers of the components to build project.

As they are adding a plastic washer to set a core gap, it's apparently an ungapped core, so the one with the higher AL value in the suppliers listings.

The plastic washer reduces that to an appropriate level.

This appears to be an appropriate one (a pair of cores):

https://www.digikey.co.uk/en/products/detail/epcos-tdk-electronics/B65671D0000R048/3913912

And the coil former to go with those:

https://www.digikey.co.uk/en/products/detail/epcos-tdk-electronics/B65672B0000T001/3913927?s=N4IgTCBcDaIEIDYCsCDsY4AZuYCrYEYQBdAXyA

The N48 material also seems OK.

 

[peter g]

i ordered the core and bobbin. where do i get the spacer? so. i wind 6o turns, insulate and wind 15 turns?

 

[rjenkinsgb]

where do i get the spacer?

According to the instructions, you make it from a piece cut from a normal plastic bag?

 

[Nigel Goodwin]

i ordered the core and bobbin. where do i get the spacer? so. i wind 6o turns, insulate and wind 15 turns?

Have you tried reading the article? - it gives full and exact instructions for winding the transformer.

 

[peter g]

yes, i've read the article several times, and will attempt to wind it. thanks to all for your generous help.

 

[Lightium]

It looks like a good project to build.

 

[Nigel Goodwin]

It looks like a good project to build.

Yes, I was quite fancing building one - not that I've got any use for it

 

[Jverive]

Most manufacturers of switchmode power supply transformers/inductors will be happy to help you with selecting magnetics parts for this or any other step-up (boost) converter. The given circuit is actually pretty simple, and you can use a variable resistance instead of the multiposition switch.