A rough calculation:
2000 per channel = 150mW x 2000 = 300W per channel or 150W with a 50% safety margin
4000 JFETs would cost roughly 500 €/$
Count about a tenth of that for SMD film resistors
Basically that's a 1k$ project.... less if you already have the casing and PSU.
Not so cheap in the end despite the huge cost difference between 2SK170 and 2SK209... still that would be a very entertaining project.... plus the joy of buying a whole 3000 parts reel from Mouser lol !
2000 per channel = 150mW x 2000 = 300W per channel or 150W with a 50% safety margin
4000 JFETs would cost roughly 500 €/$
Count about a tenth of that for SMD film resistors
Basically that's a 1k$ project.... less if you already have the casing and PSU.
Not so cheap in the end despite the huge cost difference between 2SK170 and 2SK209... still that would be a very entertaining project.... plus the joy of buying a whole 3000 parts reel from Mouser lol !
Hopefully they don't need to be matched!
How many 2SK209 do you think they have in stock?
There should be enough for us DIY's without prices goes up?
Mounting that many…...it has to be done by machines?
Of course it could be good practice to hand solder SMD's……
10 - 20 pr. day…….it would take some time...….
How many 2SK209 do you think they have in stock?
There should be enough for us DIY's without prices goes up?
Mounting that many…...it has to be done by machines?
Of course it could be good practice to hand solder SMD's……
10 - 20 pr. day…….it would take some time...….
To me this sounds like an automated assembly line job...
Sounds like cheating. Part of the attraction to this amp was the fact that is was all hand-soldered. Kind of like, I can print a very good copy of the Mona Lisa, but I'd rather look at the real thing.
Any good candidates for a 'Beast With a Thousand Op-Amps'?
I discovered that RS Components offer these N-channel jfets in SOT23 ceramic package:
https://docs-emea.rs-online.com/webdocs/0f92/0900766b80f922bf.pdf
Can they be used for audio amp applications?
Ceramic package may make them more temperature stable?
https://docs-emea.rs-online.com/webdocs/0f92/0900766b80f922bf.pdf
Can they be used for audio amp applications?
Ceramic package may make them more temperature stable?
I discovered that RS Components offer these N-channel jfets in SOT23 ceramic package:
https://docs-emea.rs-online.com/webdocs/0f92/0900766b80f922bf.pdf
Can they be used for audio amp applications?
Ceramic package may make them more temperature stable?
These are special RF parts costing ~ $44 each. So stereo 4000 x $44 = $176k?
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run them with 150mW each........ say goodbye to amp very soon
Which is why I'm considering a 50% margin
Using thick copper, and large pads should greatly help dissipate heat
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