11 Jul
2007
11 Jul
'07
1:40 p.m.
And that 90V battery was probably the single biggest
reason why I never b=
uilt=20
one of those...
Back when I built mine, 90V batteries were still fairly easy to obtain.
Nowadays, I'd probably go to the local 'pound shop' and buy 10 cheap 9V
batteries and link them in series. The current drawn is so low that even
cheap-n-nasty 9V batteries would last quite a time.
IMHO it's cheating to use a step-up switching regulator IC. If you've got
one of those, you can get a 555 timer ;-)
-tony