I recently purchased this Jameco Kit to make use of an old speaker I had. It's an amplifier which uses the TDA2003 IC and the kit also includes a power circuit that allows you to run and charge a 12V lead acid battery making the speaker portable.
I've assembled the kit (it's my first project involving audio) and I'm encountering some awful sound problems. I've connected it to my bench power supply @12vdc, the speaker and my input, an old DAP. The lead acid battery has not yet been attached.
I'm hearing more hum/buzz than anything else. especially at low volume. When I touch one of the audio channels on the 1/4" input jack with my finger, the sound is more audible. And when I make contact with one of the jack's input channels to the ground/heatsink of the TDA2003 the sound is vastly improved. Video is below.
I've assembled the circuit per the kit's instructions and double-checked solder joints, caps, etc. I'm guessing I have a significant grounding problem, can anyone suggest what I should be checking?
Thanks!
I've assembled the kit (it's my first project involving audio) and I'm encountering some awful sound problems. I've connected it to my bench power supply @12vdc, the speaker and my input, an old DAP. The lead acid battery has not yet been attached.
I'm hearing more hum/buzz than anything else. especially at low volume. When I touch one of the audio channels on the 1/4" input jack with my finger, the sound is more audible. And when I make contact with one of the jack's input channels to the ground/heatsink of the TDA2003 the sound is vastly improved. Video is below.
I've assembled the circuit per the kit's instructions and double-checked solder joints, caps, etc. I'm guessing I have a significant grounding problem, can anyone suggest what I should be checking?
Thanks!