Small 4700uF 35V caps

[ppppenguin]

I've replaced the 220u caps and tacked in some (physically oversize) 2200u to see how it works. There's a faint background hum, audible with ear pressed to speaker. Using 4700u makes no audible difference. It's the sort of hum that I can't really see on the 'scope at 20mV/div at a x10 probe tip. I could hook up a direct conenction to the scope to give me 2mV/div but don't think it's worth the effort.

All the lower value will do is reduce the maximum power output slightly. This doesn't matter. So I'll get some 3300u caps.

Trevor, thanks for your kind offer but it's quicker and easier for me to order from RS.

I still have a trade account with RS so I get free delivery for all orders.