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2 votes

The effect of input and output impedance

It is assumed that at least one of the two quadrupoles presented by the applicant is active. The configuration is the well-known Series-Shunt and the study must be done using the H parameters and the ...
Franc's user avatar
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3 votes

Connecting an op-amp to a second-stage amplifier: loading effect considerations

A common way to drive a coax connector is with a 49.9 (standard value) series resistor. This performs multiple functions: It isolates the load from the amplifier which minimizes the possibility of ...
Kevin White's user avatar
  • 33.3k
3 votes

Watching an open-collector input without disturbing it

Your "black magic box" must be drawing some current through R2 and the transistor base-emitter junction, turning the transistor on. You could try adding a diode between the black box and ...
GodJihyo's user avatar
  • 23.4k

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