Hi!
Afther that I read so many good things about the JFets, I would like to ask:
Is it possible to modificate the original BOZ that I would use 2SK389 in stead of the IRF610?
I know "in principle it is possible to replace a 610 with a 389, BUT the BIAS CONDITIONS are very different. Usually, some adjustment will be necessary".
Any ideas?
Greets:
Tyimo
Afther that I read so many good things about the JFets, I would like to ask:
Is it possible to modificate the original BOZ that I would use 2SK389 in stead of the IRF610?
I know "in principle it is possible to replace a 610 with a 389, BUT the BIAS CONDITIONS are very different. Usually, some adjustment will be necessary".
Any ideas?
Greets:
Tyimo
The 2sk389 is not a "manly" device, it is a wimp, a weakling compared to the IRF610.
To use the 389 you'd need to reduce both bias and rail voltages to keep the dissipation and voltage in check. There is a thread or two about this if you search. Cascoding is probably a good idea, or you could simply use one of the opamp circuits here or on passdiy without an output stage. The problem with no output stage is that the 389 would not drive low impedance loads well.
Others much more knowledgeable than me may be able to offer better ideas on using the 2sk389 in a BOSOZ type topology.
To use the 389 you'd need to reduce both bias and rail voltages to keep the dissipation and voltage in check. There is a thread or two about this if you search. Cascoding is probably a good idea, or you could simply use one of the opamp circuits here or on passdiy without an output stage. The problem with no output stage is that the 389 would not drive low impedance loads well.
Others much more knowledgeable than me may be able to offer better ideas on using the 2sk389 in a BOSOZ type topology.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=73149
Also look at the Lovoltec amp thread, those devices are suitable.
edit: Isn't slang in a second language fun? I think it's funny that you have learned taciturn before hearing the word wimpy. But then you'd find any attempt by me to speak any language other than English hilarious.
Also look at the Lovoltec amp thread, those devices are suitable.
edit: Isn't slang in a second language fun? I think it's funny that you have learned taciturn before hearing the word wimpy. But then you'd find any attempt by me to speak any language other than English hilarious.
Tyimo said:
you'll need sort of follower for any wimpy Jfet instead of IRF.....
supply voltage is dictated with preferred loadline and passive or active load for Jfet
if you choose resistor,simple equotation will give you PS voltage
maybe is best solution to try with LU Jfet,when you have it
in that case ,you'll can make J BOZ with preferred virtues of "old" BOZ- simplicity,'nuff current and 'nuff amplification......all that with triode transfer function....
Tyimo said:
No . . . 2SJ310 is P-CH JFET.
Mine is J310 N-CH (Fairchild) - IRF620.
http://www.fairchildsemi.com/ds/J3/J309.pdf
jh
Hi again!
I hoped that I coud build a BOZ with the Lovoltech Jfets, but I am afraid that they will never arrive..... :-(
So, I thougth I could try somethign different: I have some Hitachi 2SK216. I know it is not JFet, but, is it possible to use them in the BOZ instead of the IRF610??
Greets:
Tyimo
I hoped that I coud build a BOZ with the Lovoltech Jfets, but I am afraid that they will never arrive..... :-(
So, I thougth I could try somethign different: I have some Hitachi 2SK216. I know it is not JFet, but, is it possible to use them in the BOZ instead of the IRF610??
Greets:
Tyimo
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