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impedance matching

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mahin said:
i have bf417 and bf418.
Click to expand...

Those can't handle the current you need. Try 2SD1815, 2SB1215 transistor pair (or equiv substitutes) and 4700 ohm resistors, or MJE200, MJE210 transistor pair (or equivalent substitutes) and 2200 ohm resistors.
 
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