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Old 28th January 2013, 07:09 AM   #121
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Thumbs up congratulations!

Quote:
Originally Posted by dadod View Post
Finally I did first listening.
I am still impressed from the first post of your thread
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regards, Pawel
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Old 28th January 2013, 12:11 PM   #122
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Originally Posted by padamiecki View Post
I am still impressed from the first post of your thread
Thanks Pawel
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Old 28th January 2013, 02:35 PM   #123
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Hey Dado. I should have looked this up sooner. Here is what Edmond did to bias the Baxandalls. Look at R12 and R14 in Figure 5:

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Old 28th January 2013, 03:52 PM   #124
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Originally Posted by keantoken View Post
Hey Dado. I should have looked this up sooner. Here is what Edmond did to bias the Baxandalls. Look at R12 and R14 in Figure 5:

Super TIS
Kean, but Q7 an Q8 are biased differently. Do you have suggestion for that? Changing it according R12 and R14 did not change anything.
dado
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Old 28th January 2013, 04:49 PM   #125
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Nevermind Dado, there is no point in applying Edmond's scheme to this design because of the unequal current mirror ratios.

Also, you may acknowledge my contribution on the final schematic. I think this circuit deserves a snazzy schematic.
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Old 28th January 2013, 05:52 PM   #126
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Quote:
Originally Posted by keantoken View Post
Nevermind Dado, there is no point in applying Edmond's scheme to this design because of the unequal current mirror ratios.

Also, you may acknowledge my contribution on the final schematic. I think this circuit deserves a snazzy schematic.
Kean did you notice this Current conveyor as a voltage amplifier
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Old 28th January 2013, 06:57 PM   #127
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Well, that's why I made my suggestion. In the schematic in post 117 you could add my name next to yours. In any case, the idea was yours and you are doing the testing. I helped refine the design.

Not meaning to demean, I just really like this circuit. It deserves good documentation.
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Old 28th January 2013, 09:24 PM   #128
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OK here it is.
Attached Images
File Type: jpg GainWire-300.jpg (227.6 KB, 299 views)
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File Type: txt BOM-GainWire-300.txt (802 Bytes, 29 views)
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Old 29th January 2013, 09:15 PM   #129
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Here is what I think to use for shunt regulator to power GainWire. I don’t have spice models for IRF610/9610 mosfet so I used what was close enough just to simulate it. Input voltage is +-42V because I have such transformer. I like to use quite simple circuit to get good shunt regulator. This one is similar to the Borbely simple shunt reg, just I did not want to use zener diode, so here is CCS + resistor instead. I am not sure that 1.3V is enough to get JFET CCS to work properly, but some use just 0.65V. I simulated one more complex circuit and did not get significantly better result.
dado
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File Type: jpg shunt-regulator-double-PSRR.jpg (217.5 KB, 226 views)
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Old 29th January 2013, 10:13 PM   #130
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Can you show output impedance?

I like this design. However the bases of Q10 and Q12 see an impedance of 10k. It's like having 10k base stoppers. You may try bypassing R3 and R12. Even something as small as 10p may work well. I have not actually studied it however.

IIRC Salas made a DN2540 model, and I'm guessing that is what you should use. I'm no expert on shuntregs like this, but if you can make sure it's stable then the circuit looks great to me.
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