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Old 8th October 2011, 05:36 PM   #1061
ramallo is offline ramallo  Europe
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Quote:
Originally Posted by carpenter View Post
Do you happen to have the exact schematic you used?
This schematic

Click the image to open in full size.
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Old 8th October 2011, 07:14 PM   #1062
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by ramallo View Post
I tried the jboz with the 310 with bad results, more distortion and an hf oscillation (Maybe I did some things wrong)
there is sort of 310 BOZ sch posted by Juma

it works flawlesly

search
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Old 9th October 2011, 07:06 AM   #1063
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Quote:
Originally Posted by ramallo View Post
This schematic

Click the image to open in full size.
I played around with your ideas and came up with some valuable modifications:
(there's a very nice power curve and decent gain)
Attached Images
File Type: png J310 BOZ Carpenter.PNG (12.8 KB, 704 views)
File Type: png J310 BOZ voltages.PNG (36.5 KB, 697 views)
File Type: png J310 BOZ current.PNG (37.7 KB, 650 views)
File Type: png J310 BOZ power curve.PNG (32.8 KB, 93 views)
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Old 9th October 2011, 08:35 AM   #1064
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Nice, can you simulate this with a JFet-current source in the source.

Thanks
Joao
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Old 9th October 2011, 08:52 AM   #1065
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Quote:
Originally Posted by Joao@AltheaMusica View Post
Nice, can you simulate this with a JFet-current source in the source.

Thanks
Joao
Of course!
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Old 9th October 2011, 10:09 AM   #1066
ramallo is offline ramallo  Europe
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Quote:
Originally Posted by Zen Mod View Post
there is sort of 310 BOZ sch posted by Juma

it works flawlesly

search
Yes, was based on the Juma schematic, but not luck here. I did the J310 preamp and have worse numbers than the K170 (The only good thing is much lower gain) (I made two preamps at the same time for do the mods and comparisons).
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Old 9th October 2011, 10:10 AM   #1067
ramallo is offline ramallo  Europe
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Quote:
Originally Posted by carpenter View Post
I played around with your ideas and came up with some valuable modifications:
(there's a very nice power curve and decent gain)
Thanks , I'll try it
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Old 26th October 2011, 07:03 AM   #1068
tmblack is offline tmblack  United Kingdom
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This might have been asked before but what is the purpose of the 475 resistor in series with the output capacitor?
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Old 26th October 2011, 12:20 PM   #1069
juma is offline juma  Germany
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Quote:
Originally Posted by ramallo View Post
This schematic

Click the image to open in full size.
R5 and R6 have wrong values in that sch.
R6 overloads the JFET (you can keep it but make it 100k) and R5 needlessly increases the output impedance (22R is enough to isolate cable capacitance).

Last edited by juma; 26th October 2011 at 12:22 PM.
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Old 26th October 2011, 06:25 PM   #1070
tmblack is offline tmblack  United Kingdom
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Does it work with 12V power supply?
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