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jonclancy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jonclancy Quote  Post ReplyReply Direct Link To This Post Posted: 22 Dec 2009 at 11:20am
Originally posted by mrarroyo mrarroyo wrote:

oqvist, Graham is working on a kit to convert the silver cased Solo's to Solo SRG. It is not out yet.


Now available here:

http://www.headphoneamplifiersusb.com/solosrgiiupgrade.htm

Jon


Edited by jonclancy - 22 Dec 2009 at 11:21am
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mrarroyo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mrarroyo Quote  Post ReplyReply Direct Link To This Post Posted: 22 Dec 2009 at 11:51pm
Nice going there, congratulations.
Miguel
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Post Options Post Options   Thanks (0) Thanks(0)   Quote adwatts Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2013 at 4:02pm
looking forward to the new e-comerce site. It will really enable you to simplify the process and cut out the middleman reseller a bit.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mhamilton Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2019 at 9:13pm
I heard from other member that a Power Supply kit suitable for 5V output  is on the way.
Can you provide more info on the availability.
Is a schematic available ? 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2019 at 3:49pm
The circuit isn't all that different from other proposed linear regulators. Basically it is what you see on the LM350 data sheet (https://www.onsemi.com/pub/Collateral/LM350-D.PDF fig. 20).

The LM350 has been around since about 1980 (https://ia800703.us.archive.org/0/items/NationalSemiconductorVoltageRegulatorHandbook1980/NationalSemiconductorVoltageRegulatorHandbook1980.pdf page 10-93), and has been used in a colossal number of circuits.

To get 3 amps continuous out of it requires some care about heatsinking, balancing it with ripple voltage so that with all rated mains voltages reasonably good load regulation is achieved without ripple breaking through.

Load regulation can never be as good as quoted for the device because wiring drops voltage. The constructor might wish to experiment by taking the adjustment feed from the output terminals if perfection is required.

There are overvoltage crowbars on both outputs (5V and 3V3) should the voltage regulator outputs exceed the set voltages. This would obviously signal a faulty regulator or adjustment circuit fault.

The current state of play can be seen here: https://www.hifisystemcomponents.com/forum/5v-3a-psu_topic4221_post59767.html#59767

I am waiting seeing the finished casework from the metalworking supplier. It seems to be taking an awfully long time, but that's the UK for you...
Not simple enough for Google-Bot to understand...
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Post Options Post Options   Thanks (1) Thanks(1)   Quote D8venich Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2020 at 11:32am
Hi everyone, I am new to this forum and wanted. I have started to try out diy amplifier kits and got a £10 special from ebay. Whilst searching for another I came across the Graham Slee solo and decided to go for one as I always wanted a Graham Slee amp.
Can this kit be upgraded? I know it is really good already, but if there any suggestions please let me know.
Thanks 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2020 at 12:03pm
Hi Dave and Welcome to the forum.
The Solo sounds superb as is, the best upgrade would be the PSU1 power supply. Grahams' designs are very well thought out in terms of pcb layout, circuit and components. Changing components runs the risk of upsetting the balance. If you trawl through the forum you'll find copious notes from Graham on his designs and the fine tuning applied to get the unique natural sound signature he is rightly proud of.
The current thread on the 1970s amplifier design gives a good insight into the detail involved: https://www.hifisystemcomponents.com/forum/1970s-design-indulgence_topic4543.html

Plenty of friendly help is available here, all you have to do is ask!

Happy Building
Ian
Just listen, if it sounds good to you, enjoy it.
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