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mrarroyo wrote:
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HiFi System Components Ltd
Welcome to the Graham Slee Audio Products Owners Club  Open to all owners plus those contemplating the purchase of a Graham Slee audio product wishing to use our loaner program: join here |
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jonclancy 
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Joined: 14 Jan 2008 Status: Offline Points: 105 |
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 Posted: 22 Dec 2009 at 11:20am |
Now available here: http://www.headphoneamplifiersusb.com/solosrgiiupgrade.htm Jon Edited by jonclancy - 22 Dec 2009 at 11:21am |
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mrarroyo
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Joined: 28 Jul 2008 Location: Miami Beach, FL Status: Offline Points: 1401 |
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Posted: 22 Dec 2009 at 11:51pm |
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Nice going there, congratulations.
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Miguel
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adwatts
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Joined: 12 Feb 2013 Status: Offline Points: 5 |
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Posted: 12 Feb 2013 at 4:02pm |
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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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mhamilton
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Joined: 24 Sep 2019 Location: California Status: Offline Points: 43 |
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Posted: 25 Sep 2019 at 9:13pm |
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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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Graham Slee
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Telling it as it is Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 9907 |
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Posted: 26 Sep 2019 at 3:49pm |
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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... |
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Not simple enough for Google-Bot to understand...
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D8venich
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Joined: 20 May 2020 Status: Offline Points: 7 |
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Posted: 20 May 2020 at 11:32am |
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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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BackinBlack
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Joined: 05 Feb 2012 Location: Hinton, N'hants Status: Offline Points: 1587 |
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Posted: 20 May 2020 at 12:03pm |
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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
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Just listen, if it sounds good to you, enjoy it.
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