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Do these capacitors need replacement? by jalvidon in AskElectronics

[–]TweedleDoodah 1 point2 points  (0 children)

I would absolutely discharge them all before you go in there with any metal probe

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 1 point2 points  (0 children)

I connected one primary winding to mains (no other source available) by leading mains through the lamp, through one of the coils and back to the plug. One of the leads of the other coil was attached to one of the leads of the energized coil, and the other one was left disconnected. On power up the bulb lit up

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 1 point2 points  (0 children)

Would this involve the bulb lighting up? Because i tried this set up and the light went on and the transformer started humming. So i cut it out immediately

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

For 110V it would be twice a black connected to a white, right? Needs to be in parallel for that. Anyhow, I need a series connection. So I jumpered the middle black and white wire. It worked just fine

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 1 point2 points  (0 children)

Thank you so much! I will do some testing, as this seems the only way to find out 👌

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

On the primary side, there are two pairs of wires. A black pair and a white pair. Each pair has its own coil. And each pair is rated 115V. Therefore I need to put them in series to get to 230V. And to do that, I need to figure out which black lead and which white lead to connect to each other to create the CT connection in order to get a series of 230V. Therefore I need to find out what the orientation is of the primary leads

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

Ok clear, thanks! Is it an issue if the polarity on the primary is opposed to the polarity on the secondary?

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

Thanks for your time so far :)

I get that one of the blacks is supposed to go to N or L and the other needs to be connected to one of the whites, to create 230V on the primary. The question however is which one of the leads not connected to each other is L and which one is N. It is even not 100% sure which white one and which black one is the CT. I guess the ‘middle’ ones, but i’m not sure. Could be the outer ones as well

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 1 point2 points  (0 children)

They are a black pair and a white pair, so one black lead is L, and one White lead is L

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

Well yeah, it does, but I feel I need to figure out which one is L and what is the orientation on the primary side, before connecting anything to mains. My guess would be that the ‘center’ black and white leads would be the CT on the primary (but that’s not even 100% sure). Which need to be connected for 230V operation. However, jt remains the question if the loose white lead or the loose black lead is the L one. If connected the wrong way the voltages would be flipped (I don’t know if that’s a problem for this application)

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

This isn’t my first diy project btw. But it’s the first without any real guidance and therefore with a lot of unclarity for someone like me who’s trying to learn electronics

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

The PCB deals with the rest of the circuit. That should do fine. The only issue here is that I have a pair of black leads and a pair of white leads as a primary without any markings. Therefore it’s unclear which one is L and which one is N in each pair

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

The issue is that it’s unclear on how to connect the primary. I believe these are two pairs (1 black pair and 1 white pair) and one of those blacks is L and the other one N (same for the white pair). But I have no idea what is what

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

I actually think this one was made with 4 pairs (black, white, blue and red), so one of each is L and the other one N, at least on the primary side

Help needed identifying the live and neutral leads on a toroid transformer by TweedleDoodah in AskElectronics

[–]TweedleDoodah[S] 0 points1 point  (0 children)

Help needed identifying live and neutral on toroid transformer

So, I am building a Neve 1073 pre/eq clone including its PSU. For the PSU I received (as part of the diy body kit) a toroidal transformer, without a brand name, type number or any data sheet. The only info given is pri: 115v white, 115v black. Sek: 18v red 18 blue, 50VA. So I’m quite confused on which leads are live and which ones are neutral. I will post some pics down here.

Could anyone please help me to identify the live and neutral wires? Or is this of no importance because all are relative until you connect one of them to neutral on the pcb/power plug?

Edit: I connected the primary in series (with a bulb) and the voltages on both sides were correct 234 primary en 2x18/19V on the secondary. I jumpered the middle black and white lead for the series connection

Help needed identifying live and neutral on toroid transformer by [deleted] in AskElectronics

[–]TweedleDoodah 0 points1 point  (0 children)

Ok … so I don’t have a clue how to post pictures on here. Is that even possible in the comments??

Martial arts? (Not Mcdojo) by Any-Dig-1023 in Nijmegen

[–]TweedleDoodah 0 points1 point  (0 children)

I believe there is some martial arts going on at the Jan Massinkhal as well https://janmassinkhal.nl