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L'Amp: A simple SIT Amp
L'Amp: A simple SIT Amp
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Old 20th August 2018, 08:47 PM   #2951
plasnu is offline plasnu  United States
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Quote:
Originally Posted by Rodeodave View Post
I'm currently gathering parts for a L'Amp build. I'm going for the twin bulb version with a regulated adjustable supply based on the Zen v3 (cap multiplier). I'd like to generate the negative bias from the main transformer, like the schematic that popped up in post #1953 L'Amp: A simple SIT Amp Is there any further information on where that circuit originated from, and more importantly, if it actually works?
If you are talking about adjustable bias like SIT-1, I don't think the schematics has been officially released. For non-adjustable bias, extra a few ohm resister and a cap worked for me.
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Old 1st September 2018, 10:23 AM   #2952
Rodeodave is offline Rodeodave  Austria
hates ground loops
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L'Amp: A simple SIT Amp
Got almost everything together:
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Old 1st September 2018, 10:24 AM   #2953
Rodeodave is offline Rodeodave  Austria
hates ground loops
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Quote:
Originally Posted by Michael Rothacher View Post
NP posted that.
Do you remember in which thread perhaps?
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Old 1st September 2018, 01:24 PM   #2954
Michael Rothacher is offline Michael Rothacher  United States
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L'Amp: A simple SIT Amp
RO85 Zen

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Old 10th October 2018, 07:17 AM   #2955
juanitox is offline juanitox  France
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Click the image to open in full size.

i want to try this thing but it gives me nightmare sometimes , if you short the speaker return accidentally to the chassis you will fry your speaker with 29V DC , is it possible to move the bypass cap on the output side so if you short the positive speaker cable to chassis or your hand you will have " only" 6V?

just an idea don't slap me
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Old 10th October 2018, 07:56 AM   #2956
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by juanitox View Post
Click the image to open in full size.

i want to try this thing but it gives me nightmare sometimes , if you short the speaker return accidentally to the chassis you will fry your speaker with 29V DC , is it possible to move the bypass cap on the output side so if you short the positive speaker cable to chassis or your hand you will have " only" 6V?

just an idea don't slap me
why so affraid my friend? why there would be a DC voltage on chassis? I only connect the chassis to IEC ground. my build has no issue

SIT L'Amp - Google Drive
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Old 10th October 2018, 09:22 AM   #2957
juanitox is offline juanitox  France
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ok , so your chassis is floating ( not connected to ground ) and just connected to the earth. don't you have more hum like that ?
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Old 10th October 2018, 11:53 AM   #2958
gadut is offline gadut  Indonesia
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the only connection from audio ground to chassis is on my dac, and dac chassis is connected to earth.

my preamp and amplifier is floating as you mentioned, so far i never had any hum
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