Hi Folks,
I'm helping out with a school project using an off-the-shelf EQ module board from Amazon/eBay.
https://www.ebay.co.uk/itm/265122265065
We got it working and it sounds great but after a few minutes the output distorts, mostly to white noise. Suspecting a faulty module we bought a different one from a different supplier but ran into the same issues.
A power cycle of the board resets it for another few mins and then it distorts again. We tried semi-isolating the input and outputs by employing a battery-powered MP3 player for input and a battery-powered mini-amplifier for output and even tried running the boards via a battery but the same thing happens. We've also tried various other input sources, and various amplifiers on the output and even switched to a bench power supply but no luck so far. Obviously it could be a fault with the two modules so we've ordered a third one (they are very cheap!).
Considering these graphic eq modules are for sale all over the internet there doesn't seem to be any useful information on connecting them up, though it does seem pretty logical looking at the terminals on the board. Maybe we're doing something fundamentally wrong, like needing a resistor and/or capacitor on the input and outputs? The only thing I can think of is that we're not using a power supply with a ground (only +ve & -ve) but there is no noise interference or hum when it's working.
Anyway, I just wondered if anyone here has come across these modules, and if so had any success in getting them to work properly? If not, thanks for taking the time to read this, I know we're all busy people!
Best Regards,
Emily & Darren.
I'm helping out with a school project using an off-the-shelf EQ module board from Amazon/eBay.
https://www.ebay.co.uk/itm/265122265065
We got it working and it sounds great but after a few minutes the output distorts, mostly to white noise. Suspecting a faulty module we bought a different one from a different supplier but ran into the same issues.
A power cycle of the board resets it for another few mins and then it distorts again. We tried semi-isolating the input and outputs by employing a battery-powered MP3 player for input and a battery-powered mini-amplifier for output and even tried running the boards via a battery but the same thing happens. We've also tried various other input sources, and various amplifiers on the output and even switched to a bench power supply but no luck so far. Obviously it could be a fault with the two modules so we've ordered a third one (they are very cheap!).
Considering these graphic eq modules are for sale all over the internet there doesn't seem to be any useful information on connecting them up, though it does seem pretty logical looking at the terminals on the board. Maybe we're doing something fundamentally wrong, like needing a resistor and/or capacitor on the input and outputs? The only thing I can think of is that we're not using a power supply with a ground (only +ve & -ve) but there is no noise interference or hum when it's working.
Anyway, I just wondered if anyone here has come across these modules, and if so had any success in getting them to work properly? If not, thanks for taking the time to read this, I know we're all busy people!
Best Regards,
Emily & Darren.
