I know that this question has been asked and answered many times before. But have we come to a final answer. Is it shielding, better grounding or other. If it shielding , how is it done also with grounding. My amp hums on mains power but my small battery is fine. Stops when I touch the jack.
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If the hum stops when you touch the jack that would indicate a grounding issue, without the benefit of knowing your set up and wiring of the pickup in your guitar (-:
I have found the Noisy Cricket (LM386) amps I build are sensitive to poorly regulated power supplies. The symptoms are as you describe. One fix is a power regulator such as LM317 to clean up the power
Or a capacitor (>470uf) across power and ground near the DC power input to the board... This too sounds like a poorly regulated power supply...
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