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JamJar: an HPA-1-inspired power amp
JamJar: an HPA-1-inspired power amp
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Old 23rd November 2019, 09:43 AM   #11
Itsmee is offline Itsmee  England
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JamJar: an HPA-1-inspired power amp
I like the BJT Cascode Current Mirror, page 21
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Old 23rd November 2019, 10:11 AM   #12
EUVL is offline EUVL  Europe
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See also :
UTHAiM -- Just for Fun (post #11)
UTHAiM -- Just for Fun (post #89)
UTHAiM -- Just for Fun (post #116)


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Old 23rd November 2019, 11:52 AM   #13
Itsmee is offline Itsmee  England
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JamJar: an HPA-1-inspired power amp
Don't know if it would help, but this is where I am with mine - almost, double JFET on the next one.
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Old 23rd November 2019, 12:22 PM   #14
EUVL is offline EUVL  Europe
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Your cascode voltage setter can be much simpler.
Your Wilson mirror with BJT is not connected correctly.
There is not a lot of benefit using dual JFETs.
And unless it is for headphone, the output devices are not powerful enough for loudspeakers.


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Old 23rd November 2019, 01:45 PM   #15
Itsmee is offline Itsmee  England
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JamJar: an HPA-1-inspired power amp
Quote:
Originally Posted by EUVL View Post
Your cascode voltage setter can be much simpler.
Yes, tried most variations, just wanted to see if I could here a difference to the TL431
Quote:
Your Wilson mirror with BJT is not connected correctly.
It's not a Wilson, see page 21 of the PDF in post 11
Quote:
There is not a lot of benefit using dual JFETs.
Thank you, I did wonder that, I don't know if I don't try it, I'm not spice compatible yet, working on it, and I don't have a formal education in analogue design, I'm just a knuckle scraper.
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And unless it is for headphone, the output devices are not powerful enough for loudspeakers.
That's what the Little Pucker is for.

I have been playing with variations for years, I found the Knut Harald Nygaard version about 5 years after my first prototype, his predates mine by about 6 years!

Seems I reinventing the wheel (again), I usually find the original years after I've done the hard work!
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Old 23rd November 2019, 01:58 PM   #16
EUVL is offline EUVL  Europe
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The current on both legs of your mirror is not balanced due to base current.


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Old 23rd November 2019, 02:17 PM   #17
Itsmee is offline Itsmee  England
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JamJar: an HPA-1-inspired power amp
That's page 22, page 21 states Because VCE1= VCE2, this mirror will have very good matching if βF is very large. The BC327-40 has a minimum hfe of 250, is that not good enough?

Forgot to add, have a look at the summery on page 32.

Last edited by Itsmee; 23rd November 2019 at 02:21 PM.
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Old 23rd November 2019, 02:38 PM   #18
Markw4 is online now Markw4  United States
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Quote:
Originally Posted by EUVL View Post
See also :
UTHAiM -- Just for Fun (post #11)
UTHAiM -- Just for Fun (post #89)
UTHAiM -- Just for Fun (post #116)
Turns out that one can link to individual posts. Just right click on the post number at the upper right corner of a post and select 'copy link,' or left click on the post number and it will open a new window with that post at the top of the page. Then you can copy the link address from that new window.

Perhaps that is already what you were trying to do, but the links don't go directly to the posts in parenthesis for me.

Last edited by Markw4; 23rd November 2019 at 02:42 PM.
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Old 23rd November 2019, 02:44 PM   #19
EUVL is offline EUVL  Europe
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> but the links don't go directly to the posts in parenthesis for me.

Because I use 50 posts per page, and you probably not.


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Old 23rd November 2019, 02:48 PM   #20
Markw4 is online now Markw4  United States
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Ah, yes. An interesting feature of the forum software. But then, why offer individual post links at all without a mention they probably won't work for default page format users?
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