Electronics > Projects, Designs, and Technical Stuff
8 ratios in one transformer alternatives
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Psi:

--- Quote from: gkmaia on May 16, 2019, 12:11:33 am ---How hard it is to separate the iron blades of a working iron core transformer? They are glued... any way to release them?

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They're not to bad to get apart.
Putting them back together correctly is the hard bit.
If you DIY it they will always end up with tiny gaps and hum loudly when energized.
So i don't recommend rewinding EI cores unless you have the proper gear.


Toroids on the other hand are awesome but have the disadvantage of taking longer to wind by hand since you have to keep threading wire through the center hole for each turn.


Are you in Auckland, you can have that 70x33mm toroid if you want.
I dunno if its the right wattage for what you want though.
soldar:

--- Quote from: NiHaoMike on May 16, 2019, 12:14:38 am ---To cut down on the number of taps required, you can use Golomb spacing.
https://en.wikipedia.org/wiki/Golomb_ruler

Example: if you tap a winding so that it's 10V-10V-20V, the possible output voltages are 10V, 20V, 30V, and 40V, selectable using only 2 relays.

--- End quote ---
I would much rather have a transformer with the required taps than trying to work it out with switches because mechanical switches are much more prone to failure and should be avoided as much as possible.
NiHaoMike:

--- Quote from: soldar on May 16, 2019, 11:15:20 am ---I would much rather have a transformer with the required taps than trying to work it out with switches because mechanical switches are much more prone to failure and should be avoided as much as possible.

--- End quote ---
How else would you switch between the taps? I do think a solid state alternative such as a switching regulator would be the better choice but there's not enough information on why so many output voltages are required.
soldar:

--- Quote from: NiHaoMike on May 16, 2019, 02:25:22 pm --- How else would you switch between the taps? I do think a solid state alternative such as a switching regulator would be the better choice but there's not enough information on why so many output voltages are required.
--- End quote ---
What I mean is I would rather only switch one side than both ends. Having a double switch is more expensive, complicated and prone to problems than just getting the right taps in the first place.
NiHaoMike:

--- Quote from: soldar on May 16, 2019, 06:50:25 pm ---What I mean is I would rather only switch one side than both ends. Having a double switch is more expensive, complicated and prone to problems than just getting the right taps in the first place.

--- End quote ---
In the 10V-10V-20V example, you'll note that only two SPDT relays are needed to achieve all 4 possible output voltages. Start with three separate 10V, 10V, and 20V windings, with one 10V winding permanently in circuit and the other two switched in and out with relays. You'll find that with the correct arrangement, you'll be able to common two connection pairs and reduce the secondary lead count from 6 to 4.
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