The rough build works, the smooth build doesn't !

[Doodlebug]

I built an unusual sawtooth generator recently, knocked it up roughly
and it worked first time.
It was unusual in that the ramp down instead of being immediate was a slowish
drop in volts.

Having proved it worked I rebuilt it nicely.

You've guessed it. It didn't work ! I checked and rechecked but all seemed
wired OK.
So I'm going to use the rough version until I sort my brain out! :-)

Bet this has happened to others too.

[ppppenguin]

Common problem. Either you built it wrong the second time or the design is too sensitive to strays or minor variations in components.

[Terry]

... or perhaps he built it wrong the first time ...