I have blown my Topping amp that I use for my laptop sound. Had it connected to my bench supply and for some crazy reason I reached to the bench supply to turn up the volume. Ho Hum. It is designed for a 12 volt supply and must have gotten close to 30 volts when it blew. I only have a basic electronics understanding and some soldering skills.
I understand this amp to be a T class unit. It has an on-board DAC to connect to my laptop's usb port. After blowing it I am measuring a permanent short across positive and negative input of around 3 ohms and this is not polarity dependant. I have disconnected one leg from a couple of surface mounted Schottky diodes and couple of electrolytics that looked shorted when in circuit, but these were red herrings. The DAC chip is an OPA 2134PA and the amplifier is a TA 2024.
I cannot find a circuit diagram on the net and trying to work out what is connected to what on this double sided pcb is well beyond my capability. I don't understand how this amp works and wonder if anyone could steer me in the right direction as to the most likely component(s) that could have blown due to my abuse and that would result in such a low ohms short?
Any guidance at all would be great, else it will have to go in the bin
Many thanks.....Mike
I understand this amp to be a T class unit. It has an on-board DAC to connect to my laptop's usb port. After blowing it I am measuring a permanent short across positive and negative input of around 3 ohms and this is not polarity dependant. I have disconnected one leg from a couple of surface mounted Schottky diodes and couple of electrolytics that looked shorted when in circuit, but these were red herrings. The DAC chip is an OPA 2134PA and the amplifier is a TA 2024.
I cannot find a circuit diagram on the net and trying to work out what is connected to what on this double sided pcb is well beyond my capability. I don't understand how this amp works and wonder if anyone could steer me in the right direction as to the most likely component(s) that could have blown due to my abuse and that would result in such a low ohms short?
Any guidance at all would be great, else it will have to go in the bin
Many thanks.....Mike
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