Am evaluating budget amplifiers for use in testing and building of active speakers. My latest is one of these:
https://www.parts-express.com/sure-electronics-aa-ab31316-1x400w-class-d-audio-amplifier-board-(t-amp-technology)--320-3344
Am using the recommended Meanwell power supply and a nice $25 case I bought on ebay. My normal setup is a Dayton APA-150 and want to replace it with a more pure amplifier. To test the amp, I use an adapter cable from the headphone jack to the RCA input of the amp. Everything is fairly cool with the APA-150, but the t-amp is have all kinds of nasty distress with my old iphone SE.
It is mainly hiss and hum. I have tried different grounding to no effect, but when I plugged my Amazon echo into the t-amp, all was good again. Any ideas?
https://www.parts-express.com/sure-electronics-aa-ab31316-1x400w-class-d-audio-amplifier-board-(t-amp-technology)--320-3344
Am using the recommended Meanwell power supply and a nice $25 case I bought on ebay. My normal setup is a Dayton APA-150 and want to replace it with a more pure amplifier. To test the amp, I use an adapter cable from the headphone jack to the RCA input of the amp. Everything is fairly cool with the APA-150, but the t-amp is have all kinds of nasty distress with my old iphone SE.
It is mainly hiss and hum. I have tried different grounding to no effect, but when I plugged my Amazon echo into the t-amp, all was good again. Any ideas?
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