Of course I want you to have them. PM me your address and phone (for customs) and I'll get them on their way to you shortly. I'm just a week after back surgery so it may take a bit longer than I'd like to hit the post office, but I'll try.
Thank you so much 🙂
For your back (this is what happens when you lift Alephs too often 😀), I hope you'll be better soon. I know how you feel, I also got a back surgery a few years ago (L5-S1 discal hernia)..... So, please, get away from class A building for some times 😛
PM sent
For your back (this is what happens when you lift Alephs too often 😀), I hope you'll be better soon. I know how you feel, I also got a back surgery a few years ago (L5-S1 discal hernia)..... So, please, get away from class A building for some times 😛
PM sent
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I'm going to do another 'beginner to build...." as soon as I receive the "kari" boards, new dumb questions, photos, trial and errors to come 😀
BobEllis: If you have the BOM at hand, can you send it to me, as I want to know if I can find the parts in Germany (want to avoid Digikey customs fees)
BobEllis: If you have the BOM at hand, can you send it to me, as I want to know if I can find the parts in Germany (want to avoid Digikey customs fees)
It's pretty easy and fun to etch your own boards. 🙂
The Balanced Zen Line Stage is pretty much the best DIY article Mr. Pass has ever written.
A jewel in the crown 😎
The Balanced Zen Line Stage is pretty much the best DIY article Mr. Pass has ever written.
A jewel in the crown 😎
yes ; little more capacitance to fight against , but nothing to worry
maybe just a bit darker sound
best ones are still not published
Just two need to be matched - the ones that make up the differential pair. Fairly close matching wouldn't hurt on the cascodes, but is not necessary.
And although the boards allow for heat sinks on the differential they are not needed. Cascode limits the voltage across the differential to ~6V (10V reference - Vgs of the cascodes). It would probably be a good thing to replace the cascode voltage references with 20V zeners.
And although the boards allow for heat sinks on the differential they are not needed. Cascode limits the voltage across the differential to ~6V (10V reference - Vgs of the cascodes). It would probably be a good thing to replace the cascode voltage references with 20V zeners.
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I understand, it's the input transistor (if I'm not wrong) so no matching with its second board counterpart.
So Q2 and Q3 are the cascode and Q4-Q5 the output fets?
So Q2 and Q3 are the cascode and Q4-Q5 the output fets?
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Q4-5 are the differential pair that need to be matched within each channel, do not need to be matched to the other channel. Yes, Q2-3 are the cascodes. Qx is the CCS.
So Qx delivers Constant Current to the differential pairs Q4-Q5 (amplify voltage difference, not actual voltage) and Cascodes Q2-Q3
For the trafos, shall I go with two 50VA (230Vac primary, 60V secondary 0.833A) or a single 80VA (230Vac primary, 2X55V secondaries 0.727A)?
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the original article has us using 2 transformers, because it's hard to find 50VA transformers with 60v secondaries.
Each transformer having 30V secondaries, tied together to give us 60V for the + side and 60V for the - side.
So you'd only need one if you can get it with dual 60V secondaries - unless you want to
do mono power supplies for each channel.
Each transformer having 30V secondaries, tied together to give us 60V for the + side and 60V for the - side.
So you'd only need one if you can get it with dual 60V secondaries - unless you want to
do mono power supplies for each channel.
So:
-50VA; 230VAC; 60V; 0,833A for positive rail
-50VA; 230VAC; 19V; 2,63A for negative rail
50VA rating are the least I can find easily here (except for 19v, I can find 20VA)
-50VA; 230VAC; 60V; 0,833A for positive rail
-50VA; 230VAC; 19V; 2,63A for negative rail
50VA rating are the least I can find easily here (except for 19v, I can find 20VA)
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