Thanks for that David and thanks for your patience with me. You could be a teacher. Today I was trying my best to determine the path of the Dc circuit as I feel the problem lies there (not sure why but because the AC side is live in quite a few places but no power light or fan). Following the...
http://www.utkcomponent.com/en/current-sense-transformers
Could this transformer be the unit that drops the high voltage DC down to a level where the 7812 voltage reg can do its thing for powering up? I woke up thinking of it :laughing:. (furlough madness). I'll try and check it in circuit...
Thanks David yes that backs up what I was thinking. Unpowered, the middle 4 pins 11,12,21,22 have continuity. Powering A1/A2 switches the contact so 11,14,21,24 have continuity. So in an actual power on test we would expect voltage to go to A1 A2 ? This doesnt happen. Its only when I put...
Could someone explain this relay please? If I connect external 12v to pins A1 and A2, the relay clicks and power goes to the power light and the fan runs (unit not plugged into wall at that point). Could it be the other contacts take in higher voltage from the board and then supply the lower DC...
Thanks David, I'll have a look today with it live and see what I get from the windings. I dont remember checking continuity between different windings so i'll check that first.
Tony
Sorry David I never answered the reg question, I dont think it can rectify its a normal 7812 albeit a surface mount one not through board but using ext power supply I can see the difference in the fan speed so its working with DC at that point. I can't find the source of the 12v though to...
Hers the transformer. Note the extra coil hanging off the side. Not sure what that does. The ends of each wire all have nearly zero ohms so it seems ok but I dont know how to test them really.
The small brownish looking wires feel like single strand and are the aux + and - . After probing...
Ah ok thats good to know. I wonder what the aux + and - are for then. The + has a trace connected to the 7812 reg and from there to the relay so maybe the relay is taking low V AC?. The 2 windings from the transformer have continuity, can I do more to check this?
Cheers
Tony
Well, all parts arrived Thurs from Mouser and fitted new parts and.... nothing. Got the light bulb soldered where the resistor would go in anticipation too :). So I get 240 ac in, rectifier showing 300ish DC out. The 12v side doesnt seem to be alive so when powered off if I put 14v from a power...
Ah I forgot to get a pic but it reminded me of a familiar logo. Its ST . I think I'll order the mouser ones labelled G15N.. I have other stuff to get anyway so if it goes bang we'll know they were wrong :). I wouldnt mind cheap if they were easy to get to but one of the set is hidden and the...
Thanks Eddie, are you happy that the part number G15...... is what I need as Ive not seen them described as IBGT and now David mentioned it and Im in doubt. ps if I get it running I'll check the input V on the 7812's.
Cheers
Tony
Ooh you put doubt in my mind now. It seems when searching some are described as diodes, IGBT or mosfet. I think there is confusion over the labelling of the pins. I might be wrong but drain and source is the "flow" once activated and the same for collector/emitter. The gate in both cases turns...
Its ok I realised the ON semi... is a 220 package so not what I need (clamp issues maybe)
The Mouser site sells Vishay for £2 each so if I order £33 pounds worth of stock its free delivery, so I might stock up on some caps and resistors too. (I have an original Space Invaders that uses lots of...