Re: Making a Q-meter /
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Googling Output resistance of an emitter follower, I find it's input resistance divided by (Beta + 1) plus some other factors, internal emitter resistance of Q2, etc, that I as a FPGA designer couldn't understand. Beta of a darling configuration is the beta of Q1 times beta of Q2. 50 ohm Rin (R1, R2, R3 in parallel) /(100 (beta of Q1) * 30 (beta of Q2)) would be 0.018 ohms. Beta numbers are SWAG. Would a real analog engineer speak up here? At any rate, the output resistance would seem to be much lower than R5, 220 ohms, or 75 ohms, R1 of transformer.
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Would really like to read the complete manual for the 4342A. John On 9/16/2022 5:51 PM, Mikek wrote:
I'm not sure I agree, the schematic I posted shows a 75¦¸ resistor across the transformer as Zo. |
John Kolb