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These calculations will tell you the correct voltage and VA ratings for the transformer you’ll use to power your amp. Let’s start by figuring out how much voltage and power your amplifier will need from the power supply. BE SURE TO TAKE ALL NECESSARY SAFETY PRECAUTIONS, AND NEVER WORK ON A LIVE CIRCUIT!! Determine the Required Power Supply Voltage and Power WARNING: THIS PROJECT INVOLVES WORKING WITH MAINS SUPPLY VOLTAGES THAT CAN SERIOUSLY INJURE YOU OR KILL YOU.
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SPEAKER ENCLOSURE DESIGN SOFTWARE FREEWARE FULL
It may be in the device’s user manual, but if not, you can get a rough estimate by playing a 60 Hz pure sine wave (there are apps that will do this) at full volume and measuring the AC voltage between ground and the left or right channel with a multi-meter. You should be able to find your speaker’s impedance on the back of the speaker or in the user manual.įinally, you’ll need to know your input voltage. This is the output voltage of the audio source you’ll be amplifying. You’ll also need to know the impedance of your speakers. The maximum output power of the LM3886 is 68 Watts, but the actual power you get will depend on your power supply voltage and speaker impedance. Output power is what you’ll typically see stated as the Wattage rating of an amplifier. At the end I wire up the amp so you can hear what it sounds like:īefore starting to design your amplifier, you should have an idea about how much output power you want to get out of it. You can also check out this video to see a quick overview of the design process. Set the High Frequency Cutoff at the Amplifier’s Input.Set the Low Frequency Cutoff at the Feedback Loop.Set the Low Frequency Cutoff at the Amplifier’s Input.Find the Maximum Thermal Resistance of the Heat Sink.Convert the Total Power to a Transformer VA Rating.Find the Output Power from a Transformer’s Voltage Rating.Find the Maximum Supply Voltage Output by a Transformer.Find the Maximum Supply Voltage Needed by the Amplifier.Determine the Required Power Supply Voltage and Power.Since this is a rather long article, here are links to the different sections: