Question
The output stage of an amplifier is to be matched to the impedance of a speaker as shown Figure P6.31. If the impedance of the speaker is $8 \Omega$ and the amplifier requires a load impedance of $3.2 \mathrm{k} \Omega$, determine the turns ratio of the ideal transformer.Figure P6.31 can't copy
Step 1
The impedance of the speaker \( Z_s = 8 \, \Omega \) and the required load impedance for the amplifier \( Z_a = 3.2 \, k\Omega = 3200 \, \Omega \). Show more…
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A transformer is used to match an amplifier with an $8-\Omega$ load as shown in Fig. $13.105 .$ The Thevenin equivalent of the amplifier is: $V_{\mathrm{Th}}=10 \mathrm{V}$ $Z_{\mathrm{Th}}=128 \Omega$ (a) Find the required turns ratio for maximum energy power transfer.. (b) Determine the primary and secondary currents. (c) Calculate the primary and secondary voltages.
In Fig. $31-35,$ let the rectangular box on the left represent the (high-impedance) output of an audio amplifier, with $r=1000 \Omega$ . Let $R=10 \Omega$ represent the (low-impedance) coil of a loudspeaker. For maximum transfer of energy to the load $R$ we must have $R=r,$ and that is not true in this case. However, a transformer can be used to "transform" "resistances, making them behave electrically as if they were larger or smaller than they actually are. (a) Sketch the primary and secondary coils of a transformer that can be introduced between the amplifier and the speaker in Fig. $31-35$ to match the impedances. (b) What must be the turns ratio?
In Fig. 32-39 let the rectangular box on the left represent the (high-impedance) output of an audio amplifier, with $r=$ $1000 \Omega$. Let $R=10 \Omega$ represent the (low-impedance) coil of a loudspeaker. For maximum transfer of energy to the load $R$ we must have $R=r$, and that is not true in this FIGURE $32-39=$ case. However, a transformer can be $\quad$ Problem 37 . used to "transform" resistances, making them behave electrically as if they were larger or smaller than they actually are. Sketch the primary and secondary coils of a transformer that can be introduced between the amplifier and the speaker in Fig. $32-39$ to match the impedances. What must he the turns ratio?
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