I have an amplifier model circuit where I've determined the load (speaker) voltage (using its peak power output and its resistance) and measured the open-circuit voltage.

How can I work out the Thevenin resistance?

I am familiar with finding Rth when condensing a standard linear circuit but struggle to work backwards.

Any help or suggestions are much appreciated.

  • \$\begingroup\$ $$R_{TH} = R_L \left( \frac{V_{OPEN}}{V_{LOAD}}-1\right)$$ Where V_open is a open-circuit voltage and V_laod is an output voltage with the load connected. \$\endgroup\$
    – G36
    Apr 30 '20 at 8:28
  • \$\begingroup\$ @G36 Thanks, much appreciated! \$\endgroup\$
    – Hendrik
    May 1 '20 at 2:22

$$R_{TH} = R_L \left( \frac{V_{OPEN}}{V_{LOAD}}-1\right)$$

Where V_open is the open-circuit voltage and V_load is an output voltage with the load connected.

Provided by user G36.

  • \$\begingroup\$ @Michael Thanks, need to learn how to do that \$\endgroup\$
    – Hendrik
    May 1 '20 at 10:24

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