Hi,
I have had a few of these cheap amplifiers which have been great for different little projects, but this recent one I got once plugged in gave me a minor shock from the metal case.
It is a Lvpin (also seen as lepai) LP-2020A+ as shown on this ebay link:
https://www.ebay.com.au/itm/Lvpin-Tripath-Class-T-Hi-Fi-Audio-Mini-Amplifier-With-12V-Power-Supply-LP-2020A-/281845921682The ones I've had before have been great little units for the price, and put out quite a lot of sound for the package.
It runs of 12V DC so it doesn't have an earth pin, and something must be going wrong as it was a noticeable shock, though far from other electric shocks I'd received in my life.
I attached a wire to the case and to earth with my multimeter in series to take some readings and it is showing steady 84 volts AC, and 0.04 A.
I opened the case and tested a few points and got the same voltage, although some points such as the two tone potentiometers in the middle as shown in the attached photo were sitting at 15 volts AC.
Even the 3.5mm audio jack and the speaker outs were 84VAC! However the unit operates completely normally aside from this.
I'm a computer systems engineer so my electronics knowledge is fairly basic, but I'm trying to learn more. Any idea of what could be the cause of this, and if it is possible to fix, or is it not worth it?
From a basic visual glance nothing seems damaged or out of place.
Thanks,
Darren