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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
The YARRA Preamplifier/HPA for Melbourne DB Group Buy
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Old Yesterday, 09:30 AM   #621
gary s is offline gary s  Australia
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Great work X, thanks a lot for the sim results and adding the option to the PCB.
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Old Yesterday, 09:42 AM   #622
gary s is offline gary s  Australia
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Hi again X, with regards to your comment re low impedance, are you talking about changing the value of R102 in this circuit from 47K as shown down to 51 ohm - or are you referring to a resistor on the Yarra main PCB, if so what is that resistor number, thanks?
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Old Yesterday, 02:18 PM   #623
xrk971 is offline xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
No, R126 and R136 on the main board. If you have the output coupling cap on the main board, you don’t need it on the daughterboards. Or vice versa. For those with DC coupled output boards, the on board coupling cap C112/111 are we useful.

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Last edited by xrk971; Yesterday at 02:22 PM.
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Old Yesterday, 11:52 PM   #624
gary s is offline gary s  Australia
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Hi again X, thanks for the correction on my assumption for the resistor change, much appreciated.

Now another tech question for you, seeing you like to answer them. I wonder what this new circuit would sim like if one were to use the Toshiba 2SJ313 instead of the IRF610 (same pin outs). If OK that would give an all Toshiba active device circuit for all who are nostalgic about these great but now obsolete devices. By the way, the genuine Toshiba 2SJ313 is still available from a few sources around the globe.
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Old Today, 12:34 AM   #625
asuslover is offline asuslover  Romania
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
I was really happy with the bom of this project, I see no reason to complicate the things ....
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