What kind of 'noise' is it?
Background hiss like white noise or something containing regular tones.
Note that the TDA2030 is over 30 years old - amplifiers have improved a lot since then!
I doubt the diodes do anything useful, if they are intended to protect against back-emf from the speakers they need to be faster responding than 1N400x series.
Brian.
yes, you may want to try a 2k2 - 10k res in series with the 100pF too, on the LHS of the cap ...
noise is inherently wide band - there is no notching it out - most noise "filters" are low pass filters, I'm sorry I can't clarify further than " put a resistor in series with the 100pF cap " with the resistor at the pin 2 end or LHS, ( left hand side ) of the cap.
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please don't forget to post your results
The TDA2030 is old and was cheap so of course it produces hiss. It is not made or available anymore. The more modern TDA2030A also is obsolete and is not made or available anymore.
An LM3886 is more modern and was designed for high fidelity with a spec'd maximum very low amount of noise.
I have some in stock but they have been collecting dust for 30 years. The last time I saw one in a commercial product was probably in the mid 1980s, they were commonly used in low cost domestic "Hi Fi" units when cassette tapes were considered high quality and 8-track players were common. I would add that many of those "Hi Fi" units used to boast 20W per channel but the TDA2030s didn't even have heat sinks. I would think more like 5W per channel at 10% distortion but nobody checked in those days.
Brian.
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