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DIY transformer and two-component epoxy adhesive
DIY transformer and two-component epoxy adhesive
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Old 20th February 2018, 06:05 PM   #51
Elerion is offline Elerion  Spain
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Join Date: Sep 2017
Good news

After three rewinding processes, I achieved 1 Tesla, and,... guess what.
No buzz or noise whatsoever.
No shim, and of course no gluing.
Even without bolts!
I need my multimeter or magnetic field meter to know weather the transformer is powered or not. If I touch the laminations, I do feel a very soft vibration.

Unfortunately, the copper loses have increased, and I wouldn't ask this trannie for more than 220 mA B+ current. As I built it for a KT88 SE amplifier biased at 80 mA (each), I assume it will be OK.

Filament winding is 6.65 V unloaded. I hope it stays over 6V when loaded.
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Old 20th February 2018, 11:07 PM   #52
TonyTecson is offline TonyTecson  Philippines
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DIY transformer and two-component epoxy adhesive
congratulations!!!

now you know how mr. Tesla influences things...
regulation is of course the trade off....
but you are as far away from core saturation as you need be..
what i do in my build is to design the unloaded voltages a bit higher than wanted
so that when under load, your target is met...
anyway starting from higher voltage it is easy to lose some voltage,
i will choose it over than when you do not have enough of it...
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Old 21st February 2018, 03:01 PM   #53
Elerion is offline Elerion  Spain
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Just one more question.
When adding bells, which are grounded via chassis, the core becomes grounded.
Using four isolated bolts (also using nylon spacers, so they don't touch the bells) would be enough, isn't it?
Core should be grounded (for safety) and no eddy currents coming from the bolts.
Is there any other better approach?
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Old 21st February 2018, 10:38 PM   #54
TonyTecson is offline TonyTecson  Philippines
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DIY transformer and two-component epoxy adhesive
the nylon shoulder washers are used to help in the eddy current to minimise,
using plastic bobbins, there is little chance that the copper winding touch the core,
if the endbells have electrical contact with your metal chassis, then so does your core..
nothing much to worry about...
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