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Old 23rd February 2006, 01:45 AM   #1
diyAudio Member
Join Date: Jan 2004
Location: Minnesota
Default max input resistance for irf610

ok here is the deal:

can I connect a IRF610 at 18v supply connected as a source follower with a 47K input resistance?


1:1 input transformer with a 47K resistance connected across secondary.

one end to bias
other to gate of IRF610

IRF610 running at 200mA.

loaded with a 1:10 step-up tranny with a 1K across secondary.

input to 1:1 is just output of cd player or pre-amp i.e. 2v.

will this work and is there anything i should be aware of?

also what is output impedance of IRF610? is it 1.25 ohms?
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Old 23rd February 2006, 02:07 AM   #2
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Join Date: Dec 2005
Location: Kuala Lumpur
The ac source resistance is the output impedance of your source plus the transformer resistance, typically less than 1k. The 47k is across the 1:1 output winding and in parallel with it.
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Old 23rd February 2006, 02:22 AM   #3
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Join Date: Jan 2004
Location: Minnesota
Default so...

so in my example what is the input impedance to the IRF610 given a 150 ohm output impedance from cd player?

i am trying to figure out what if any will affect HF performance with the input capacitance of the mosfet at the input?

so with a 1:1 and a 47K secondary termination to the IRF610 I should NOT have any concern about bandwidth?

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