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Old 11th March 2006, 04:15 PM   #1
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Default help with interstage tranny with SS?

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!!
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Old 12th March 2006, 05:13 PM   #2
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Default no help yet?

aw come on, any help at all????
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Old 13th March 2006, 04:14 PM   #3
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hmm... no takers yet?
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Old 13th March 2006, 05:26 PM   #4
CBS240 is offline CBS240  United States
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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?
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Old 13th March 2006, 05:37 PM   #5
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Default 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!
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Old 14th March 2006, 01:46 AM   #6
anatech is offline anatech  Canada
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Hi AudioGeek,
Most of us would avoid the use of interstage transformers. Among other things, they cost more.

Yes, linearity always matters.

-Chris
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Old 14th March 2006, 12:50 PM   #7
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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.
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Old 14th March 2006, 01:13 PM   #8
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An interstage gapped for 200mA and 1:10 on top of that. Good luck finding such a part.
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