[quote name='Al Heeley' post='580803' date='Aug 25 2009, 11:22 PM']Now that sounds clever! The other mod suggested was to add a 10k pot in parallel to the Cap3 33nf, so that the hi-pass effect could be tapered off to allow more bass - sort of like adding a tone ctrl to it. Again, not yet tried myself but in the pipeline - must get me a breadboard.
Re: tant cap, they are polar, yes? Is that influencing the signal in the path vs a non-polar cap irrespective of its value?[/quote]
yeah they are, I don't think it does particularly, it was one I had to hand so I just plugged it in to try out. It only works one way round tho.
I did try a 1K pot instead of the resistor from 9V to Vdd of the chip to get some voltage sag, it did have some effect, but I didn't particularly like it.
If I get the chance I'll try the parallel pot mod - some kind of rudimentary tone control could be useful