The Power Amplifier (PAMP) is used for sound and circuit experiments and simply amplifies the input signal fed to it. There are a number of sources you may choose as an input signal, each with its own advantages and disadvantages.

  • LabQuest – The Power Amplifier App on a LabQuest 3 (LABQ3), LabQuest 2 (LABQ2), or LabQuest (LABQ) (running LabQuest App verison 1.2 or newer) is designed specifically for the Power Amplifier. Use the app to create an AC (amplitude, waveform, and frequency) signal or DC (voltage) output. In most cases, the LabQuest will produce the amplitude and frequency you select. But it will struggle to create clean waveforms at low frequencies. Connect the LabQuest’s audio output to the Power Amplifier’s 3.5mm audio input port using the stereo audio cable that came with the Power Amplifier.
  • Function Generator – Nearly all function generators, such as the Frequency Generator (FGEN-PAMP), can be used as an input signal for the Power Amplifier. See the Power Amplifier User Manual for details about how to connect the function generator to the Power Amplifier. A function generator will create exceptionally clean waveforms at nearly all frequencies. But it may take some trial-and-error to get the output amplitude from the Power Amplifier you want; the Power Amplifier applies a factor of 10x to the input signal.
  • Your computer’s sound card, controlled by our Power Amplifier Function Generator software – The Power Amplifier can use the output of your computer’s sound card as an input signal. Our Power Amplifier Function Generator software mimics the LabQuest’s Power Amplifier App to do so. While this option seems simple, modern computer operating systems can make using the software tricky. Note: The Power Amplifier Function Generator software will not work on macOS 11 or newer.
  • Your computer’s sound card, controlled by a third-party function generator app. The Power Amplifier can use the output of your computer’s sound card as an input signal. There are many function generator apps available for Mac that seem to work nicely. Audio Function Generator Pro. There is a free version and a paid version for $5.99. It seems to work fine. You control the volume with the Mac keyboard. You choose the waveform with the app. There are similar programs for Windows computers.
  • Logger Pro with a LabQuest or LabPro – You can use our Logger Pro software with a LabPro or LabQuest interface as an input signal. For more details, see Can I drive the Power Amplifier using Logger Pro?.
  • SensorDAQ – You can use our SensorDAQ (SDAQ) with LabVIEW software as an input signal for the Power Amplifier. For more details, see How do I drive the Power Amplifier using a SensorDAQ?.

Related TILs
Power Amplifier Troubleshooting and FAQs

Published: May 12, 2022. Updated: November 12, 2024.