What is powering it now so you can hear the buzzing?
The question out of the blue and the most information we have is buzzing, no power switch, and a faulty wall wart is not much to work with. A picture from Walmart doesn't help because we don't know what was delivered versus what was pictured on their website. Asking what might have gone wrong without schematics (if you have any that maybe were included), clear pictures of the finished HA, and any other component information (max wattage and max voltage) makes would help making this less of a guessing game. You have a multimeter, well test what you can. What are the resistors showing? Is the pot working in terms of resistance when you turn it? Are all the traces showing continuity?
Other than your wall wart, what have you tested so far?
If you want a guess of what might have been damaged, if there was no over voltage protection... then your OpAmps could be fried -- $2 and much more in shipping if ordered on-line. If it isn't that, then maybe one of the capacitors got fried -- a few quarters. If it isn't that, then maybe a resistor got fried a few more quarters. So basically anything.
The question out of the blue and the most information we have is buzzing, no power switch, and a faulty wall wart is not much to work with. A picture from Walmart doesn't help because we don't know what was delivered versus what was pictured on their website. Asking what might have gone wrong without schematics (if you have any that maybe were included), clear pictures of the finished HA, and any other component information (max wattage and max voltage) makes would help making this less of a guessing game. You have a multimeter, well test what you can. What are the resistors showing? Is the pot working in terms of resistance when you turn it? Are all the traces showing continuity?
Other than your wall wart, what have you tested so far?
If you want a guess of what might have been damaged, if there was no over voltage protection... then your OpAmps could be fried -- $2 and much more in shipping if ordered on-line. If it isn't that, then maybe one of the capacitors got fried -- a few quarters. If it isn't that, then maybe a resistor got fried a few more quarters. So basically anything.
Yes, the guessing game is not the way to go. Just a word about myself. I’m not an experienced troubleshooter, so this is not an easy task for me. That’s why I’m playing a guessing game. The buzzing started with the first power supply which was 15vdc 400ma. The kit gave no indication what the current of the power supply should be, just 12-18vdc .So, possibly the 400ma was not enough. After I completed the kit and powered it up, hooked it up, it was working great, no problems. I disconnected the power just to move the amp. I hooked up the power again, there was a spark at the power input jack when I connected it. Then that’s when the buzzing started. I then blindly tried another wall wart, 12vdc 500ma, no spark, but still the buzzing.
So, I’m not sure where to start with my multimeter. 😕
So, I’m not sure where to start with my multimeter. 😕
Last edited:
Just got another kit, same one. Going to give it another shot. Wasn’t happy with how I did the first one. My soldering was not great. I was using a tip that was too big. Got a much thinner tip now. I’ll post again when I’m done with the second one.
Finished new kit today and all is working and looks good. This kit version is a little different from the first one, just a different layout of the parts and a number 47 is printed on the PCB. The input and output jacks are also of better quality with this version. I took more time and made sure my soldering was good. I also used a different power supply, 12vdc 500ma. So far, so good.