help with interstage tranny with SS?

AudioGeek · 11th March 2006, 04:15 PM

please see the attached diagram.

what i want to do is run 2 mosfets as source followers with a 1:10 step-up tranny in between.

A) how does the secondary load of 2.2K interact with the input cap of the mosfet?? or is it the 2.2K in parallel with output impedance of transformer?

B) If the input mosfet is a IRF610 what should the primary inductance of the IT be?

C) Should I increase the 2.2K resistor? i guess the higher value of this resistor the thd decreases (at lease on the simulator)... but i don't want it so high to roll off the HF on the second mosfet.

D) can i get away with a 1:20 step-up tranny if i increase the secondary load resistor?

E) do i even need a resistor across secondary?

F) maybe just a R/C network to tame any HF peaking on tranny?

Thankyou for any help... if you have any more questions please feel free to ask!!

AudioGeek · 12th March 2006, 05:13 PM

aw come on, any help at all????

AudioGeek · 13th March 2006, 04:14 PM

hmm... no takers yet?

CBS240 · 13th March 2006, 05:26 PM

Maybe you could use BJT's instead. They are more linear than that mosfet and have much smaller input C. Some type of feedback would help?

AudioGeek · 13th March 2006, 05:37 PM

how do i do a BJT emitter follower with transformer loading?

since the circuits are followers with a gain of 1... does linearity really matter???
Thanks!

anatech · 14th March 2006, 01:46 AM

Hi AudioGeek,
Most of us would avoid the use of interstage transformers. Among other things, they cost more.

Yes, linearity always matters.

-Chris

AudioGeek · 14th March 2006, 12:50 PM

well even if people would avoid them... can anyone point me in the right direction??

or should i post this in the tubes section?

Txs again.

analog_sa · 14th March 2006, 01:13 PM

An interstage gapped for 200mA

and 1:10 on top of that. Good luck finding such a part.

12th March 2006, 05:13 PM	#2
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	no help yet? aw come on, any help at all???? __________________ It is not you... you are it.

13th March 2006, 04:14 PM	#3
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	hmm... no takers yet? __________________ It is not you... you are it.

13th March 2006, 05:26 PM	#4
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Maybe you could use BJT's instead. They are more linear than that mosfet and have much smaller input C. Some type of feedback would help? __________________ All the trouble I've ever been in started out as fun......

13th March 2006, 05:37 PM	#5
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	well.. how do i do a BJT emitter follower with transformer loading? since the circuits are followers with a gain of 1... does linearity really matter??? Thanks! __________________ It is not you... you are it.

14th March 2006, 12:50 PM	#7
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	well even if people would avoid them... can anyone point me in the right direction?? or should i post this in the tubes section? Txs again. __________________ It is not you... you are it.


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14th March 2006, 01:46 AM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi AudioGeek, Most of us would avoid the use of interstage transformers. Among other things, they cost more. Yes, linearity always matters. -Chris

14th March 2006, 01:13 PM	#8
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	An interstage gapped for 200mA and 1:10 on top of that. Good luck finding such a part.

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