NE602 Differential Input/Output Impedance Question

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From: astone@erols.com
Date: Sat Jun 21 1997 - 19:25:24 EDT


Here's one for you gurus out there. Hopefully, someone can clear up a
bit of confusion for me. On page 72 of Spring QRPp, Jim Kortge states:
"I used a transformer to get the 750 ohm push-pull output of U1 .....
down to 50 ohms..." Rutledge's "Electronics of Radio: EE20" course
book -- indicates the output impedance to be 3K for the differential
input (or output) -- pgs. 4.8, 10.15, 10.17. Single ended input/output
impedance is 1500 ohms. In both examples, a conventional toroid
transformer is being used with the primary across pins 4 and 5 of the
NE602 and the secondary drives the crystal filter. Who's right?

Thanks for your help.

Ron (KA3J)
Bethesda, MD


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