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Post by Deleted on Apr 28, 2021 18:06:21 GMT
The transformer arrived today as well. As did the insulation and top hats. So, a bit of progress today:  I need to fit the multifet boards, and the power connectors. I think I will wire the audio direct to the board. |
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Bigman80
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Post by Bigman80 on Apr 28, 2021 19:29:50 GMT
Yes, you should absolutely do that.
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Post by Deleted on Apr 29, 2021 6:43:27 GMT
So Mouser have cancelled my order, but didn't send me a confirmation they had done so.
So the 1% 6M8 resistors have been ordered from RS. They will be here Friday.
I should have 23 spares....
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Bigman80
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Post by Bigman80 on Apr 29, 2021 6:51:31 GMT
So Mouser have cancelled my order, but didn't send me a confirmation they had done so. So the 1% 6M8 resistors have been ordered from RS. They will be here Friday. I should have 23 spares.... You never know, you may need them for something! |
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Post by Deleted on Apr 29, 2021 8:08:35 GMT
I will have a few spares after this build, due to some parts having minimum order quantities.
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Post by Deleted on Apr 30, 2021 13:33:43 GMT
The HV and LV connectors have now been fitted, as have the connectors for the MM/MC switch, and the loading plugs.
I have also fitted the multifet boards. That was fiddly ensuring that there was no short circuit caused by solder between the connections.
The missing two resistors are due on Tuesday, after that, I just need the case, and I can start making it look like a phono stage.
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Bigman80
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Post by Bigman80 on Apr 30, 2021 13:34:13 GMT
The HV and LV connectors have now been fitted, as have the connectors for the MM/MC switch, and the loading plugs. I have also fitted the multifet boards. That was fiddly ensuring that there was no short circuit caused by solder between the connections. Yes, they are a pig, but well worth the aggro |
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Post by Deleted on Apr 30, 2021 13:39:21 GMT
Before you say anything, I have already looked for a biscuit tin.
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Post by antonio on May 1, 2021 2:11:16 GMT
I'm sure you must have a local supermarket, when you buy a suitable tin, the biscuits come free.
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Post by Deleted on May 4, 2021 17:04:45 GMT
The resistors arrived today, so soldered in place.
I decided to try to power it up.
Magic smoke escaped from D7P and D8P, so some head scratching is now required, and some new parts.
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Bigman80
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Post by Bigman80 on May 4, 2021 17:22:18 GMT
The resistors arrived today, so soldered in place. I decided to try to power it up. Magic smoke escaped from D7P and D8P, so some head scratching is now required, and some new parts. Oh....that's a pisser. |
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Post by Deleted on May 4, 2021 17:26:25 GMT
Could be faulty parts, but I will be replacing all four diodes in that area.
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Post by firebottle on May 4, 2021 17:35:48 GMT
Did you wire the LV secondary correctly Kevin?
Odd that only two diodes in the negative leg of the bridge should blow.
9-0-9, so you should see about 18V or a bit more across the two outer terminals, if not then reverse one of the LV secondaries.
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Post by Deleted on May 4, 2021 17:47:52 GMT
Did you wire the LV secondary correctly Kevin? Odd that only two diodes in the negative leg of the bridge should blow. 9-0-9, so you should see about 18V or a bit more across the two outer terminals, if not then reverse one of the LV secondaries. I need to check Alan. All has been disconnected for now. |
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Post by Deleted on May 4, 2021 18:25:36 GMT
It has to be a wiring mistake.
New diodes should be here tomorrow. Before flicking on the power, I will double check what I am doing.
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Post by Deleted on May 6, 2021 7:25:00 GMT
By tomorrow, I obviously mean Friday.
I won't be using Farnell that often, unless I have to. Their next day delivery, is not next day.
I reckon I could have got them quicker from Mouser.
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Post by Deleted on May 7, 2021 9:04:33 GMT
And no the courier cannot find my house...
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Bigman80
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Post by Bigman80 on May 7, 2021 9:15:08 GMT
And no the courier cannot find my house... Jesus lol |
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Post by Deleted on May 7, 2021 9:24:49 GMT
Being impatient, I have ordered some more, which will arrive on Sunday...
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Post by Deleted on May 9, 2021 14:37:06 GMT
Diodes replaced, and we have valves glowing.
Now I just need the case and the soft start to finish it.
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Post by firebottle on May 9, 2021 14:52:52 GMT
You could try it without, Oli's is just the same..
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Post by Deleted on May 9, 2021 14:55:12 GMT
I could, but I would rather wait until I can finish it properly, in case someone gets inquisitive when it is connected to the mains.
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Bigman80
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Post by Bigman80 on May 9, 2021 15:15:37 GMT
I could, but I would rather wait until I can finish it properly, in case someone gets inquisitive when it is connected to the mains. Yeah, hang on for the case and do it right mucca.....mine is a death trap 🤣 |
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Post by mikeyb on May 9, 2021 16:25:28 GMT
Death can be fatal, so best avoided  |
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Post by electronumpty on May 9, 2021 16:29:32 GMT
There is something very cool about watching a bundle of wires and parts produce music though.
DIsclaimer - please be aware that following my numpty advice can be bad for your health. I am not recommending this at all, no way not never. 🤕
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Post by Deleted on May 9, 2021 19:32:10 GMT
Decided to check to see if the LEDs light up in MM mode.  Looks good to me.... |
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Post by Deleted on May 9, 2021 19:33:33 GMT
Now I am getting impatient about the case.
Is there any advantage about fitting a mu-metal divider between the toroid and the PCB?
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Bigman80
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Post by Bigman80 on May 9, 2021 20:05:35 GMT
Now I am getting impatient about the case. Is there any advantage about fitting a mu-metal divider between the toroid and the PCB? Not if your Traffo is already shielded. Also, you have to be very careful with MuMetal as it loses its magic very easily while working with it. |
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Post by sq225917 on May 9, 2021 20:54:43 GMT
Only if you hit it or heat it. If you just bend it once it's fine. If you bend its a few times it work hardens like buggery.
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Post by Deleted on May 10, 2021 6:29:50 GMT
It was a 0.3mm strip as advertised on eBay.
If there is no benefit, as the traffo is shielded, then I will give it a miss.
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