fetteler
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« Reply #15 on: August 10, 2013, 01:02:27 AM » |
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Indeed....the simplicity is stunning.....  Is there any chance of getting the schematic of your version? Yes... the simplicity of the actual circuitry implemented is "stunning"  This is the circuitry inside the black epoxy case of an LM 1875:  In all seriousness, there's a real danger when using integrated circuits in confusing simplicity for low component count. Please don't fall into a common trap, the two terms are not the equivalent!!! Cheers, Steve. |
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« Last Edit: August 10, 2013, 12:37:22 PM by fetteler »
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Have nothing in your house that you do not know to be useful, or believe to be beautiful.
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ropie
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« Reply #16 on: August 10, 2013, 08:54:47 AM » |
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In all seriousness, there's a real danger when using integrated circuits in confusing simplicity for low component count. Please don't fall into a common trap, the two terms are not the equivalent!!! I get your point, Steve, but I think we all know that chips are stuffed with tiny magical electrical components. What's very attractive about a build like this is the visual simplicity of the visible layout, the small overall space required, and the simplicity of construction from the DIY hobbyist's point of view. |
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dubai2000
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« Reply #17 on: August 10, 2013, 12:24:49 PM » |
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Cheers,
Wolfram
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fetteler
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« Reply #18 on: August 10, 2013, 12:38:52 PM » |
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Oh... well pardon me indeed for making such a trivial comment....
Cheers,
Steve.
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Have nothing in your house that you do not know to be useful, or believe to be beautiful.
I try to spell correctly - sometimes the dyslexia wnis!
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rfgumby
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« Reply #19 on: August 10, 2013, 02:55:56 PM » |
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Oh... well pardon me indeed for making such a trivial comment....
Cheers,
Steve.
I'm still in agreement with Steve. There's a bunch going on in there, every junction of which does have an effect on the sound. But they do kick butt from a simplicity standpoint. |
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Scott
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willbewill
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Psycho Acousticus
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« Reply #20 on: August 10, 2013, 06:34:56 PM » |
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and it does mean you can have very short signal paths within the build
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malcolm ("You can't shine if you don't burn" - Kevin Ayers)  If what I'm hearing is colouration, then bring on the whole rainbow |
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floppybootstomp
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« Reply #21 on: August 10, 2013, 07:52:28 PM » |
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I wouldn't mind a schematic of that myself, cct diags are easy enough to find with both single and dual rail supplies but I couldn't find one with that minimal amount of components.
LM1875's within the UK cost £1.88 from RS Components (minimum purchase 5) and £2.50 from Cricklewood Electronics (available singly) both plus VAT and where applicable postage.
A +/- 12, 15 or 25 volt PSU wouldn't cost too much, I'd quite like to try one myself.
Peter, the thread starter, is on holiday for a coupla weeks so it's unlikely we'll see a schematic here for a while but if anybody else knows of it - please share.
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My real name is Tony
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dubai2000
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« Reply #22 on: August 10, 2013, 11:55:12 PM » |
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Steve, not trivial at all - on the contrary a meaningful reminder, but from a DIY perspective Peter's amp simply does look simple.... |
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Cheers,
Wolfram
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reinderspeter
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« Reply #23 on: August 11, 2013, 06:50:40 PM » |
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Sorry for the lock  New smart phone, small buttons... |
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Peter PTP Audio for Lenco based idler drive Turntables, Chipamps and Power Controllers. |
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rfgumby
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« Reply #24 on: August 11, 2013, 07:48:37 PM » |
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Sorry for the lock New smart phone, small buttons... Right? Watch for "notify" as well.  |
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Scott
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reinderspeter
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« Reply #25 on: August 11, 2013, 08:04:36 PM » |
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The schematic is the most basic form of what's in the datasheet. Reese gave it to me maybe he can post it.
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Peter PTP Audio for Lenco based idler drive Turntables, Chipamps and Power Controllers. |
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reinderspeter
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« Reply #26 on: September 25, 2013, 09:46:11 AM » |
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You might want to try playing around with the power supply. It makes a big difference sometimes depending on the speakers.
It´s not a straight forward thing and involves both voltage and size. I found an 18V/200+VA transformer worked best for my setup.
I've built a new PSU for this thing with a 300VA/18V toroid (the transformer alone is over 3kg  ) The difference it makes is enormous, well worth the investment. Much darker background, way better focus and it already was very good    |
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Peter PTP Audio for Lenco based idler drive Turntables, Chipamps and Power Controllers. |
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autobayer
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« Reply #27 on: September 25, 2013, 10:24:15 AM » |
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Amazing  that must be the funniest PSU vs AMP ratio of all times. I like it  Cheers Chris |
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flencolix
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« Reply #28 on: September 25, 2013, 10:55:02 AM » |
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Is the torroid from Poland? PS: good use of the Lenco cable clamp |
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FELIX
Quad 303 33 ESL57 B&W DM4
Denon DP 2700 Elac Miracord 10h Neat P68 and around 20 Lencos
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reinderspeter
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« Reply #29 on: September 25, 2013, 11:21:49 AM » |
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Is the torroid from Poland? PS: good use of the Lenco cable clamp Ordered from Conrad. I think it is German made. |
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Peter PTP Audio for Lenco based idler drive Turntables, Chipamps and Power Controllers. |
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