I have tried to build polyphonic doorbell from elektor but after weeks of working I have several problems:
1) resistor R30 is very hot
2) the amplifier is entering into oscillation.
3) I have poor result on how melody sound on the output.
I have attached original design and second file are the schematic adapted and board routing.
1)The voltage supply is 16V on the C12. Current consumption on R30(470ohm) is 20mA.
I should also mention that signal that are not routed are connected via wires.
Can you give me hits first on the hardware part ?
2)I had a look on the datasheet of tda2006 and the advice is to have fixed resistors not a potentiometer on the feedback?!
3) I will add later the code as soon I fix first two items.
1) resistor R30 is very hot
2) the amplifier is entering into oscillation.
3) I have poor result on how melody sound on the output.
I have attached original design and second file are the schematic adapted and board routing.
1)The voltage supply is 16V on the C12. Current consumption on R30(470ohm) is 20mA.
I should also mention that signal that are not routed are connected via wires.
Can you give me hits first on the hardware part ?
2)I had a look on the datasheet of tda2006 and the advice is to have fixed resistors not a potentiometer on the feedback?!
3) I will add later the code as soon I fix first two items.
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