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Old 13th January 2013, 01:32 PM   #9001
Salas is offline Salas  Greece
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Which are those face to face TO-92s? There is no dif pair so they better not touch. Using K369?
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Old 13th January 2013, 01:34 PM   #9002
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Top two transistors are BF245 and BC560. I built the dual 170 version.

Edit:
This one
Simplistic NJFET RIAA
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Old 13th January 2013, 01:39 PM   #9003
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They better not touch. How did you manage R13 for 2W? It really needs be 2W.
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Old 13th January 2013, 01:42 PM   #9004
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IT is 2W SMD. I made pad large to help with heat. When speaking of the TO92 touching, is it simply to avoid thermal coupling.
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Old 13th January 2013, 01:47 PM   #9005
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Yes, those two are different semis doing different stuff and they must not be thermally coupled. Do you have provision to trim the 15nF RIAA cap with some Mica up to 15.15nF maybe? Cruz went there after some subjective fine tuning he mentioned. But that is not de facto for every system and cart and user of course.
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Old 13th January 2013, 01:50 PM   #9006
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I have some coming, but not with me. You can see spots on one of the boards for adding trimmer caps. Really just want to get it up and running. There is plenty of tuning to be done. I am runnning the shunts with 10R and 240mA. Here are the skins I am using. Based on the spreadheet, they should be adequate and make for easier isolation.
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Old 13th January 2013, 02:02 PM   #9007
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I have seen those two pads under the smaller XO cap that is why I commented on trimming. Not a big deal for now. Did you check the RIAA caps on LCR meter BTW?
Regarding regs, remember NOT to disconnect power rails during tests if not measured very low or zero first after power down. The 1000uF capacitors near the trimmers store enough energy to kill trimmer and kick back to the reg even. They need let to discharge first. Its in the folded PDF but I stress it here again.
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Old 13th January 2013, 02:09 PM   #9008
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Quote:
Originally Posted by Salas View Post
I have seen those two pads under the smaller XO cap that is why I commented on trimming. Not a big deal for now. Did you check the RIAA caps on LCR meter BTW?
Regarding regs, remember NOT to disconnect power rails during tests if not measured very low or zero first after power down. The 1000uF capacitors near the trimmers store enough energy to kill trimmer and kick back to the reg even. They need let to discharge first. Its in the folded PDF but I stress it here again.
I admit I did not check the caps, as I paid Parts Connexion to match them. After I get the whole operation running, I will check the RIAA curve properly. THanks for the tip, I saw that mentioned in the document.
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Old 13th January 2013, 02:31 PM   #9009
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Nice work Buzz!
I would also try with an electrolyte around 220 - 470uf with BIB in the Vref position.
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Old 13th January 2013, 02:49 PM   #9010
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You liek better than MKT? I have some Elna Silmics
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