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Old 9th April 2020, 01:49 AM   #5041
zman01 is offline zman01  Bangladesh
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chromenuts,

Congrats on completing your build. Nice work.
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Old 11th April 2020, 12:01 PM   #5042
mbrennwa is offline mbrennwa  Switzerland
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Default Aleph J for headphones

This is my latest Aleph J build. It's pretty ugly, but it works okay. It's for low-impedance headphones. It has a 2SK214 lateral FET as the gain device, and currently an IRFP150 in the Aleph current source (will change this to something smaller). Now I need to build the second channel... oh I hate perfboard!
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Old 11th April 2020, 02:26 PM   #5043
TungstenAudio is offline TungstenAudio  United States
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Brings new meaning to the term "rapid prototyping."
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Old 11th April 2020, 02:35 PM   #5044
Carlp is offline Carlp  United States
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Quote:
Originally Posted by mbrennwa View Post
This is my latest Aleph J build. It's pretty ugly, but it works okay. It's for low-impedance headphones. It has a 2SK214 lateral FET as the gain device, and currently an IRFP150 in the Aleph current source (will change this to something smaller). Now I need to build the second channel... oh I hate perfboard!
Interesting. Don't those plastic clamp protectors melt?
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Old 11th April 2020, 03:06 PM   #5045
thompsontechs is offline thompsontechs  United States
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Quote:
Originally Posted by mbrennwa View Post
This is my latest Aleph J build. It's pretty ugly, but it works okay. It's for low-impedance headphones. It has a 2SK214 lateral FET as the gain device, and currently an IRFP150 in the Aleph current source (will change this to something smaller). Now I need to build the second channel... oh I hate perfboard!



Looks like "Swiss" cheese.


Kidding ya man, it looks more like "Italian" spaghetti.


I admire what it takes to make all that stuff run from looking at a schematic and using perf board, I'm pretty sure that's beyond my level to get something working like that.



When you get it all prettied up, be sure to post before and afters.


JT
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Old 11th April 2020, 03:56 PM   #5046
Eslheadphone is online now Eslheadphone  United States
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The electrons dont care what it looks like. It's how it sounds that counts. Remember point to point wiring is in some of the best sounding tube equipment.
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Old 11th April 2020, 04:02 PM   #5047
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by TungstenAudio View Post
Brings new meaning to the term "rapid prototyping."
For me it's always the question if learn KiCad again (because I keep forgetting how it works), design a board, send it to a board house, wait, wait, wait, and get a nice board -- or do I just start building the thing using a breadboard or dead-bug style. As you can tell I rarely go the KiCad route.

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Interesting. Don't those plastic clamp protectors melt?
Nah. I am running this at 300 mA, so there is not much heat involved. But I also use this clampling method for testing MOSFETs at high power, and the plastic never had any issues.

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Originally Posted by thompsontechs View Post
Looks like "Swiss" cheese.


Kidding ya man, it looks more like "Italian" spaghetti.
There is no such thing as "Swiss Cheese", at least not in Switzerland. Maybe this (worm cheese): Casu marzu - Wikipedia

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Originally Posted by thompsontechs View Post
I admire what it takes to make all that stuff run from looking at a schematic and using perf board, I'm pretty sure that's beyond my level to get something working like that.
Translating the schematic to the board is not that difficult. The difficult thing is to not loose your nerves when you're trying to align parts to the right holes... oh, and then the bottom of that board looks like a disaster!
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Old 11th April 2020, 04:12 PM   #5048
thompsontechs is offline thompsontechs  United States
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I know that Swiss cheese isn't Swiss, but with your location it was a play on that. Spaghetti is also thought to have originated from Asian noodles too, but I digress. :P


Also, I really wasn't putting it down,...frankly, I was amazed that someone could keep all that stuff straight enough to get it working.
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Old 12th April 2020, 06:59 PM   #5049
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by thompsontechs View Post
I know that Swiss cheese isn't Swiss, but with your location it was a play on that. Spaghetti is also thought to have originated from Asian noodles too, but I digress. :P

Also, I really wasn't putting it down,...frankly, I was amazed that someone could keep all that stuff straight enough to get it working.
Don't worry, I didn't get you wrong! Here's an "explanation" of what "North American Swiss cheese" might be (I still think this is as wrong as it gets): Swiss cheese (North America - Wikipedia)

This afternoon I built the second channel. I simply made a careful copy of the Asian Spaghetti mess, and the thing worked right away! Phew... now I have to wait for some parts to make a decent power supply. I am planning for a fully dual-mono PSU using SMPS with big LCRC filters.
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Old 12th April 2020, 07:17 PM   #5050
thompsontechs is offline thompsontechs  United States
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Originally Posted by mbrennwa View Post
Don't worry, I didn't get you wrong! Here's an "explanation" of what "North American Swiss cheese" might be (I still think this is as wrong as it gets): Swiss cheese (North America - Wikipedia)

This afternoon I built the second channel. I simply made a careful copy of the Asian Spaghetti mess, and the thing worked right away! Phew... now I have to wait for some parts to make a decent power supply. I am planning for a fully dual-mono PSU using SMPS with big LCRC filters.

"Asian Spaghetti,"


That sound like it will be sweet, when you get it all policed up and running, be sure to drop in with your impressions and to let us see the finished product!
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