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Post by Deleted on Mar 30, 2020 14:10:27 GMT
This is going to be an expensive build.
Two Mod686 modules - $1k
Two Power686 PCB - $120
One ISS PCB - $69
Two Guardian686 PCBs - $120
So about $1.3k just for the PCBs. And add 20% for VAT etc. Ouch.....
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Post by firebottle on Mar 30, 2020 14:18:25 GMT
The 286 I have is in a fairly compact case but does run +/-36V for full rated output.
After experiments with the 86 build to convert to dual mono I realised it was essential to convert the 286 also.
However there isn't room in the case to fit toroids so I installed a second SMPS, I had to extend the case a little at the back to do this.
I am completely satisfied with the outcome.
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Post by sq225917 on Mar 30, 2020 20:27:01 GMT
You've got me thinking, I might add another psu board to each mono block to feed each pcb separately. I've got VA to spare in the traffo so the limit on power output is the fact that there's one psu pcb per two amp boards.
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Post by Deleted on Mar 31, 2020 7:50:44 GMT
A question, yes another one....
How difficult is it to to populate the MOD686 boards? I would say my skill level is advanced beginner when it comes to soldering.
I have replaced some surface mounted components on PCBs before.
It will bring the cost down slightly.
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Bigman80
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Post by Bigman80 on Mar 31, 2020 8:02:10 GMT
A question, yes another one.... How difficult is it to to populate the MOD686 boards? I would say my skill level is advanced beginner when it comes to soldering. I have replaced some surface mounted components on PCBs before. It will bring the cost down slightly. A lot of people save a few quid with that method, then wish they hadnt when they've finished lol.. Board comes pre populated and checked. If you make a mistake, how confident are you that you can find the fault? |
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Post by Deleted on Mar 31, 2020 8:14:47 GMT
It will be difficult, for sure.
However, if I take my time in building these I think I could manage.
I would start with the simpler PCBs.
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Bigman80
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Post by Bigman80 on Mar 31, 2020 8:45:27 GMT
It will be difficult, for sure. However, if I take my time in building these I think I could manage. I would start with the simpler PCBs. Indeed. Also one that doesn't cost so much that it would hurt to replace if you ruined it |
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Post by sq225917 on Mar 31, 2020 14:23:21 GMT
Buy the smt fitted 686 boards and do the connectors, through hole caps and output devices yourself, buy the bare psu boards.
I'll wind the coils for you, FOC.
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Post by Deleted on Mar 31, 2020 14:25:11 GMT
Thanks for the offer.
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Bigman80
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Post by Bigman80 on Mar 31, 2020 15:07:07 GMT
Buy the smt fitted 686 boards and do the connectors, through hole caps and output devices yourself, buy the bare psu boards. I'll wind the coils for you, FOC. What an asset to this forum you are, Simon.. Bravo sir. |
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Post by karma67 on Mar 31, 2020 15:36:01 GMT
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Post by sq225917 on Mar 31, 2020 18:17:56 GMT
I'd solder all the parts to the boards except the output devices. Mount boards to heatsinks, mount output devices and solder them in situ. That way you are guaranteed no tight legs or alignment stress.
Cos getting six of them lined up perfectly will be a bugger. Two was tricky enough.
I do bonzer coils, if anyone has need for 1mm coils let me know, I'm well stocked.
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Post by Deleted on Mar 31, 2020 19:10:12 GMT
I will have a think about if I want to “risk” it.
By the time I get around to ordering the bits, I may not have a choice.
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Post by Deleted on Mar 31, 2020 20:54:54 GMT
Just realised I only need one Guardian 686 for a dual mono build.
I might order that, and see how I get on with building it.
Well! I have ordered it.
It will be my first step towards a new amp.
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Bigman80
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Post by Bigman80 on Mar 31, 2020 21:34:39 GMT
Just realised I only need one Guardian 686 for a dual mono build. I might order that, and see how I get on with building it. Well! I have ordered it. It will be my first step towards a new amp. Well done, K Looking forward to build pics |
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Post by Deleted on Apr 1, 2020 11:38:25 GMT
Where do you get your parts from?
It looks like it is about €55 for the parts, but not everything is in stock.
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Post by Bigman80 on Apr 1, 2020 13:55:07 GMT
Where do you get your parts from? It looks like it is about €55 for the parts, but not everything is in stock. I usually raid Farnell They seem to have stock of lost things, except the heatsinks I need. |
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Post by Deleted on Apr 1, 2020 17:23:01 GMT
Nobody has all of the parts in stock. What a pain....
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Post by Deleted on Apr 1, 2020 18:10:28 GMT
Mouser are missing the specific resistor.
A KOA Speer MF1/4DCT52R4702F
I assume I can replace this with any other 47kOhm 1% resistor without worrying too much?
The other missing parts are available in two weeks. Molex Mega-Fit connectors
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Post by Deleted on Apr 1, 2020 19:24:59 GMT
All parts are now ordered for the dual mono Guardian 686.
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Post by Bigman80 on Apr 1, 2020 19:46:39 GMT
Well Done, K
Nothing ventured, nothing gained
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Post by Deleted on Apr 7, 2020 20:04:30 GMT
Mouser have delivered the goods. Just waiting for a Molex mega-fit connector, and a PCB before I can start.
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Post by Bigman80 on Apr 7, 2020 20:05:41 GMT
Mouser have delivered the goods. Just waiting for a Molex mega-fit connector, and a PCB before I can start. Good news....I bet you cant wait! |
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Post by Deleted on Apr 7, 2020 20:43:47 GMT
I am going to have to.
Not sure how long it will take the PCB to make it over to Europe in the current climate.
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Post by sq225917 on Apr 7, 2020 21:00:57 GMT
I've had stuff in chicago for 10 days now... US post is crap, hopefully canada is better.
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Post by Bigman80 on Apr 7, 2020 21:35:50 GMT
I've had stuff in chicago for 10 days now... US post is crap, hopefully canada is better. I have started to only use DHL when shipping from America of Canada. They seem the most reliable. |
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Post by Deleted on Apr 7, 2020 22:09:48 GMT
DHL have just returned a parcel to the guy sending it to me, with no explanation.
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Post by Bigman80 on Apr 7, 2020 23:30:56 GMT
DHL have just returned a parcel to the guy sending it to me, with no explanation. Oh.....how odd. |
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Post by Deleted on Apr 11, 2020 18:26:48 GMT
Now I have my PCB stand, work mat and illuminated magnifier.
Just need a PCB....
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Post by Deleted on Apr 18, 2020 10:31:49 GMT
Still no sign of the PCB.
I think the post office are struggling with COVID-19 restrictions.
The 686 may have to be put on hold, while we wait and see if there is any financial fallout from this Pandemic, and how it will effect us.
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