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B1 Buffer Preamp
B1 Buffer Preamp
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Old 8th March 2018, 05:11 PM   #4421
Mixi is offline Mixi  Europe
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Quote:
Originally Posted by tborzic View Post
Hi, Would it be possible to increase R1 a bit in order to lower PSU voltage?
I will be using 20V PSU, so I was aiming towards recommended voltage, especially if BF862 would be in question.

If possible, is there a need for changing C1 also, since R1 and C1 are working/acting as noise filter?

Thanks
Isn't the recommended voltage range 18-24V? So i guess 20V should be perfectly fine. On another forum people mentioned using it with power supply as low as 9V with good results.
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Old 4th April 2018, 03:25 PM   #4422
fgroen is offline fgroen  Netherlands
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I run my B1 off a symmetrical power supply with matched FETs, and did away with the input and output caps. Output offset is non-existent. Very pleased with the result.

I was wondering whether anyone has tried different JFETs, as the properties due to the buffer character may be a bit less critical compared to circuits with more than unity gain. I have procured some CPH3901's so will give them a try soon.
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Old 5th April 2018, 09:42 AM   #4423
Stanislav is offline Stanislav  Australia
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I have a B1 with 2sk369-GR.
It's been running for a good 3-4 years now. Magnificent!

Also ACA with 2sk369-BL (actually 5 channels). All good.

Soon will try it with the old 2N3819 (horror, horror!!!) cause I have hundreds of them.
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Old 5th April 2018, 10:54 AM   #4424
fgroen is offline fgroen  Netherlands
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The 2N3819 has an yfs between 3.0 and 6.5mS. Could that be the culprit?
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Old 5th April 2018, 11:06 AM   #4425
Stanislav is offline Stanislav  Australia
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It could be, but I guess if you parallel a few that can change.
Of course keep an eye on the Id and dissipation, maybe cascoding will help.

2n3819 is an exercise for the sake of it, as I said I have many of them and would prefer to use them one way or another than discard them.
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