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The Pass Pub: The High-End Off Topic Thread
The Pass Pub: The High-End Off Topic Thread
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Old 9th July 2018, 07:30 PM   #24001
Zen Mod is online now Zen Mod  Serbia
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The Pass Pub: The High-End Off Topic Thread
congrats!

post #24K



I send link to your post to Papa

guy is obviously using pcbs both from JimsAudio and DiyA Store .......
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Old 10th July 2018, 03:59 AM   #24002
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The Pass Pub: The High-End Off Topic Thread
Grab the pitchforks, let's go get him!!
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Old 18th July 2018, 02:56 PM   #24003
Dennis Hui is offline Dennis Hui  Canada
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The Pass Pub: The High-End Off Topic Thread
Been quiet in the pub...
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Old 18th July 2018, 03:08 PM   #24004
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The Pass Pub: The High-End Off Topic Thread
sorry

me furniture , as always , but being distracted lately developing some drek

doing Papa's work , he's lately working only on Sissy amps ........

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Old 18th July 2018, 06:23 PM   #24005
Itsmee is online now Itsmee  England
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The Pass Pub: The High-End Off Topic Thread
Made me chuckle
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Old 30th July 2018, 03:54 PM   #24006
Itsmee is online now Itsmee  England
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The Pass Pub: The High-End Off Topic Thread
Default Idiots Ideas Corner

Pubs been dead for a while.
Been looking around the site, there doesn't seem to be a place to post half baked ideas (most of us know too little, dangerous), and most people won't post because they don't want to make an idiot of themselves, looks like we need an idiots corner where no idea is too stupid, and I'm the biggest idiot I know.

Hears the first contribution.

I/V for my cheap Chinese ES9038PRO dac, I'd like something better than the opamps, this probably isn't it (2 circuits per channel).

The idea is based on the Zen I/V, I haven't built it - need to learn spice simulation, it isn't optimised and I don't know if it works; this is where someone tells me how much of an idiot I am, or can prod me in the right direction, this is also the bit where my precious parts are saved from destruction by not building.

Parts choice based on what's in my draw.

I'm curious as what R5 will do
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Old 31st July 2018, 12:58 AM   #24007
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The Pass Pub: The High-End Off Topic Thread
1. you're going to kill BC critters with 250mA .... always think of max current, voltage and dissipation of part ; also - 250mA look somewhat excessive .....
2. use higher value of emitter resistors in current mirrors , to have better current tracking
3. IRF parts are probably even better than 2SK/SJ there ....... so , leave these for something where is better having parts made for audio
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Old 31st July 2018, 02:53 AM   #24008
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The Pass Pub: The High-End Off Topic Thread
Thanks for the reply ZM, just what I was looking for.
I picked 20% swing because EUVL recommended a max of 25% in the CEN-SEN article - but that was for JFETS, I'll experiment.
I forgot to calculate the PD of the little critters, thanks for the catch, Iv'e got some BD139/140, wonder if the HFE might be too low?
100R emitters and IRFP240/IRFP9240 it is, I'll have to crank up the supply a bit and add cascode for JFETS.
Time to start building.

Last edited by Itsmee; 31st July 2018 at 03:01 AM.
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Old 1st August 2018, 02:58 PM   #24009
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Old 2nd August 2018, 05:49 AM   #24010
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I'll be there with a load of stuff.
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