LM1875 on TDA2030 pcb /w single rail PSU

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Let's see if I have attachments figured out.

There are some differences between the board you have and the LM1875 data sheet for single ended power supply. The diodes in your board are there for an extra measure of protection so you should leave them in. If you are changing voltage for higher output i.e. say 40 volts, then replace the cap going to the speaker and ones on the supply to at least 50 V rating. Most of the rest of the circuit is in the ball park as far as I could see with a cursory glance. i.e. input capacitor on your board is 2.2 uF and on the LM1875 is 1.0 uF. Shouldn't make a huge difference in functionality, maybe a bit in sound quality.
 

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