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These circuits have push-pull output stages and simple regulation of the output voltages. They are similar to the circuit of transistorized audio amplifiers working as DC amplifiers. Figure 3 shows ...
What types of audio amplifier circuits will you encounter, ... that should be a simple matter of measuring the open circuit voltage and then introducing a known load and measuring the loaded ...
The opamp circuit is simple. We might have considered an LM386 or some other integrated audio amplifier block to get better performance without blowing up the parts count.
This circuit uses a simple 50 Ω input termination to a non-inverting op amp. Circuit 2 employs transformer coupling with the signal applied to the non-inverting input of the op amp (Fig. 2 ...
That circuit is built around the dual low-power audio amplifier TDA2822M. The TDA2822M features PNP input transistors and an internally fixed AC gain of around 100 (36 to 41 dB), but here the IC is ...