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#81 | |
diyAudio Member
Join Date: Aug 2008
Location: Toronto
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Those 128 position relay switched resistor networks look very interesting.... |
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#82 |
diyAudio Member
Join Date: Mar 2009
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I will send him an e-mail.
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#83 | ||||||
diyAudio Member
Join Date: Aug 2006
Location: Texas
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Using a PNP current mirror won't have matching between Q1 and Q3 or Q2 and Q4 and this will be a significant source of distortion. Without the cancellation of Q1/R2 and Q3/R1, the nonlinearity of a forced (by degeneration) x10 current mirror ratio would cause failed cancellation. Quote:
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The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do! Last edited by keantoken; 21st February 2014 at 10:03 PM. |
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#84 |
diyAudio Member
Join Date: Mar 2009
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Untamed this buffer has enormous speed so earlier versions i build suffered from RF mismatch of the transmission line to my scope.
The version on Keantokens new website is stable. |
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#85 |
diyAudio Member
Join Date: Aug 2006
Location: Texas
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Hey Joachim, I added your very stylish image to my Kuartlotron page.
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__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do! |
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#86 |
diyAudio Member
Join Date: Oct 2011
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Keantoken,
Couple of more questions. For the input snubber, can the capacitance be 33pF? Will this cause any adverse effect on performance? I have 33pF cap lying around and hence I ask. Lastly, can I use BC546/556 instead of 550/560? Thanks |
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#87 |
diyAudio Member
Join Date: Aug 2006
Location: Texas
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You can increase the capacitor, but don't change the resistor.
BC546C/556C should work just as well. Can you quickly measure the Vbes with a multimeter and report the results? Also, do you know which manufacturer? This info will help with R&D.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do! |
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#88 |
diyAudio Member
Join Date: Mar 2009
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Looks good on your page.
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#89 |
diyAudio Member
Join Date: Oct 2011
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Keantoken,
I measured the Vbe's on the transistors. Both BC546C and BC556C read 0.763V. I dont know if they are suppose to match so well but that is what it read. I think the manufacturer is Fairchild semiconductor. The 'C' grade is difficult to get and I got these from PMI. hFE is around 520 for npn and 420 for pnp. Thanks Last edited by baswamin; 22nd February 2014 at 03:11 PM. |
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#90 |
diyAudio Member
Join Date: Aug 2009
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@ keantoken
Thanx for the additional info ![]() ![]() Anyway, all the best with this & your other designs etc ![]() |
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