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Post by sq225917 on Nov 30, 2020 19:33:23 GMT
Good result.
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Deleted
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Post by Deleted on Dec 5, 2020 14:57:27 GMT
Today, I built the Mezzanine. I have threaded the aluminium plate, and fitted nuts on top to make it as secure as possible. I have trial fitted it in the case, and I am happy with the result, although I have swapped the PSU boards round to but less stress on the wiring, so the rear traffo will feed the front board, and the inverse for the others.  Quite pleased with this so far, as it is going to give me loads of space to fit the other boards, and make the wiring tidy. |
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Post by Deleted on Dec 6, 2020 15:17:41 GMT
Not much progress today, but having second thoughts on the layout. If I spin the power tray round 90 degrees, it may be easier to wire up to the soft start etc. Today, I fitted the power switch. I don't know if it is blue, or orange, as I ordered both, and Audiophonics did not identify them, just popped them in the same bag... This did not go as smoothly as I had planned, as the cutting tool broke part way through. Fortunately I spotted it, and had a back up tool to hand.  I also made my XLR shorting plugs ready for when I am going to start to use it... |
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Bigman80
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The HiFi Bear/Audioaddicts/Bigbottle Owner
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Post by Bigman80 on Dec 6, 2020 16:10:28 GMT
Should be a nice surprise then lol
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Post by sq225917 on Dec 6, 2020 18:18:25 GMT
Xlr shorting plugs, please explain?
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Post by Deleted on Dec 6, 2020 20:38:45 GMT
I am going to use this with RCA connectors.
I have also fitted XLR sockets, but I am not fitting a selector switch.
To get the amp to work properly, I need to short pins 1 & 3 on the XLR socket, so with some old XLR plugs, I have soldered in a cable to do just this.
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Post by sq225917 on Dec 6, 2020 21:05:48 GMT
So tying negative input rail to ground on xlrs instead of leaving it floating when using the rca input. Makes perfect sense.
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Post by Deleted on Dec 7, 2020 6:51:56 GMT
Daft question.
How do I visually identify the positive and negative tappings of the transformer?
Are there any markings on the toroidy transformers, or am I going have to (carefully) measure them when live?
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Post by firebottle on Dec 7, 2020 8:23:02 GMT
There's no + and - as it's AC.
If all the tails are the same colour then the best way is to terminate all wires in a connector strip then measure (on AC).
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Deleted
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Post by Deleted on Dec 7, 2020 10:07:05 GMT
There's no + and - as it's AC. If all the tails are the same colour then the best way is to terminate all wires in a connector strip then measure (on AC). Where is the facepalm smiley when you need one. Of course it is AC. I have three different colours for the different tails so it should be easy enough to connect it all up. Thanks Alan. |
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Deleted
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Post by Deleted on Dec 10, 2020 13:52:59 GMT
The replacement heat sink ships tomorrow.
Just need the remaining boards to ship now (showing in stock so they should be sent soon).
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Deleted
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Post by Deleted on Dec 11, 2020 5:25:45 GMT
The boards have shipped.
I will be checking at the weekend that I have all of the bits required to finish the amp.
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Bigman80
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The HiFi Bear/Audioaddicts/Bigbottle Owner
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Post by Bigman80 on Dec 11, 2020 11:58:37 GMT
The boards have shipped. I will be checking at the weekend that I have all of the bits required to finish the amp. Looking forward to the step by step pictorial 😜 |
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Deleted
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Post by Deleted on Dec 11, 2020 12:00:08 GMT
There may be at least two steps...
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Post by brian2957 on Dec 11, 2020 15:13:24 GMT
I thought this was to be a long term ( year ) project Kevin . You seem to have done it in jig time  |
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Deleted
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Post by Deleted on Dec 11, 2020 17:43:29 GMT
This is long term.
I started back in March....
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Post by brian2957 on Dec 11, 2020 19:30:10 GMT
Ah...OK I thought you only started this project a couple of months ago Kevin . Apologies , time seems to be moving so fast these days  |
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Post by sq225917 on Dec 11, 2020 20:01:56 GMT
Pish, I built my boards over two years ago, took me 20 months to case them up. You're positively racing ahead....
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Post by macca on Dec 12, 2020 12:15:35 GMT
lol
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Post by sq225917 on Dec 12, 2020 12:37:06 GMT
That's the trouble with being a trailblazer, progress can be slow 😉
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Post by Deleted on Dec 12, 2020 18:21:53 GMT
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Post by firebottle on Dec 12, 2020 18:43:18 GMT
Well that's does actually identify phase from input to output but the significance is immaterial IMO.
I am assuming you have a centre tapped secondary for each transformer?
Is the centre tap marked, perhaps with a different colour sleeve? If it is it doesn't matter what the phase relation is with the two anti-phase windings to give plus and minus supplies after the rectifier.
If the centre tap isn't identified you will have to measure the voltages (AC) between the 3 wires. Test for the greatest voltage between two of the wires, those will be the anti-phase connections to the two AC connections on the bridge. Double check that the voltage between either of these two is the same to the third wire. If so the third is the centre tap.
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Deleted
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Post by Deleted on Dec 12, 2020 19:05:51 GMT
Thanks Alan. Just trying to follow the instructions. Pin # Connection
| Label | Connection | | 1 | AC Power transformer secondary #1 | positive phase
| | 2 | 0 Power transformer secondary #1 | negative phase (or centre tap)
| | 3 | Power transformer secondary #2 | positive phase (unused with
centre tapped transformer)
| | 4 | AC Power transformer secondary #2 | negative phase |
I have Toroidy Audio grade transformers. The 230V primary connections are both coloured white. "0" is the earth wire. Sec 1 - 24V is black to black Sec 2 - 24V is orange to orange. So if I understand correctly, it does not matter which black or orange wire I connect to the Power 686 imput pins 1&2 and 3&4 respectively, as long as I connect them as a pair across the two pins. |
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Post by sq225917 on Dec 12, 2020 20:37:57 GMT
Just wire it up 1 black, 2 black, 3 orange, 4 orange, the AC phase is immaterial once its rectified to dc.
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Post by firebottle on Dec 13, 2020 9:34:26 GMT
Whoa there. Simon is incorrect. Kevin you are using the Power-686 boards, yes? They have just 4 rectifier diodes on?
If so you need to find the centre 'tap' of your two individual secondary windings.
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Deleted
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Post by Deleted on Dec 13, 2020 11:33:13 GMT
I am using the power 686 boards.
I shall find and mark the centre taps, and connect them up as per the instructions.
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Post by firebottle on Dec 13, 2020 11:54:15 GMT
Connect a black and an orange together.
Measure the AC voltage across the other black and orange. If you have 48V then your centre tap (the joined black and orange) is correct.
If you measure next to nothing, reverse ONE secondary connection, then repeat to measure 48V.
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Deleted
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Post by Deleted on Dec 13, 2020 12:25:16 GMT
Thanks Alan.
That seems simple enough to do, and it is the answer to the question I was going to ask....
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Deleted
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Post by Deleted on Dec 13, 2020 12:29:06 GMT
Is a 400VA transformer likely to trip a 16A breaker with the inrush current?
Just wondering if I should wait for the ISS before checking or not.
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Post by firebottle on Dec 13, 2020 13:09:05 GMT
Unlikely I would have thought.
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