I don't have any experience in hardware. I am writing a simple program in Raspberry pi to write audio samples to the DAC MCP4725. Next, I want to connect to the small speaker. What should be the rating of the speaker? I need a simple circuit to do so. Like, I checked that I need to connect the ouput of MCP4725 to a capacitor to get a pure AC signal. Next, I need to amplfiy this to drive a small speaker. I am planning to connect this to 3W minimum speaker 4 ohms or 8 ohms. What are the things I need to check in the datasheet of MCP4725 in order to drive the audio?

Here is the datasheet -



1 Answer 1


to achieve 3 watts (RMS is how Vrms * Vrms / speaker_impedance. we find

Power * Speaker_impedance = Vrms * Vrms = 12

Vrms = sqrt(12) or 3.5 volts rms or about 5 volts peakpeak.

Thus you need +- 5 volts at a minimum, or 5 volts with a H-bridge power output amplifier.

  • \$\begingroup\$ how do did you arrive from 3.5 volt rms to peak voltage? \$\endgroup\$ Mar 18, 2020 at 1:01
  • \$\begingroup\$ What should be the circuitry ? \$\endgroup\$ Mar 18, 2020 at 1:50

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