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B1 Rev. 2
B1 Rev. 2
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Old 6th January 2017, 02:39 PM   #21
PKI is offline PKI  United States
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B1 Rev. 2
Quote:
Originally Posted by 6L6 View Post
That buffer block is the basis of ZenMod's "Iron Pre". Prototype PCB for the store have been ordered.
If you need a tester just say a word! :-)
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Old 6th January 2017, 03:28 PM   #22
vdi_nenna is offline vdi_nenna  United States
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B1 Rev. 2
Some other bits to help out...
Attached Images
File Type: jpg jfet_schem_symbol.JPG (15.2 KB, 1549 views)
File Type: jpg 2sk170_pin-out.JPG (20.6 KB, 1542 views)
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Old 7th January 2017, 12:41 AM   #23
dimkasta is offline dimkasta  Greece
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I have a few test pcbs and jfets incoming so I will be able to comment in a couple of weeks.

About the output resistor, I remember experimenting with 50R on my DCB1 with very nice results. My cables are really low capacitance though, and I remember Salas telling me to test for oscillations anyway.
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Old 7th January 2017, 06:37 AM   #24
2 picoDumbs is offline 2 picoDumbs  Australia
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I have a question.
In this power supply example, is 0V ground left floating, connected directly to chassis earth, or connected to chassis earth via thermistor to chassis earth?
Also remembering the bigger picture of multiple interconnected pieces of equipment.
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Old 7th January 2017, 08:04 AM   #25
Zen Mod is offline Zen Mod  Serbia
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B1 Rev. 2
isn't all that matter of choice ?
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Old 7th January 2017, 08:21 AM   #26
twocents is offline twocents  South Africa
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B1 Rev. 2
Should this not be called the B2? But it looks like B2 means something different.

I would love to build this - it is such a simple circuit. Only problem is those 2SJ74's.
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Old 7th January 2017, 08:31 AM   #27
marc brown is offline marc brown  United States
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Default B1 Rev. 2

Quote:
Originally Posted by diyRookie View Post
Should this not be called the B2? But it looks like B2 means something different.

I would love to build this - it is such a simple circuit. Only problem is those 2SJ74's.
Wouldn't that be the LSJ74's in the diyaudio store?

Last edited by marc brown; 7th January 2017 at 08:35 AM.
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Old 7th January 2017, 09:09 AM   #28
2 picoDumbs is offline 2 picoDumbs  Australia
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Quote:
Originally Posted by Zen Mod View Post
isn't all that matter of choice ?
Ok, as long as there is a choice then that is all I need to know.
Thanks
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Old 7th January 2017, 06:30 PM   #29
twocents is offline twocents  South Africa
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B1 Rev. 2
Quote:
Originally Posted by marc brown View Post
Wouldn't that be the LSJ74's in the diyaudio store?
Yeah Marc - probably the last place on earth you can still find them - at a huge cost for guys like us outside of the first world. Pity there are no alternatives for the SJ74's. Maybe Juma can come up with a plan?
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Old 7th January 2017, 07:25 PM   #30
dimkasta is offline dimkasta  Greece
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I bought some j113/j176 to test my boards before I use my dodofets on them.
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