Sometimes the Bangalore bangs and sometimes it doesn't

If the Bangalore fires the first shot of the salvo but misses subsequent ones, there could be a couple of things to check.

Have you got a missing C1 capacitor?
A long time ago, a batch of boards went out with one tiny component missing off the circuit. We didn't realise it at the time, but on rare occasions it...
Mon, 26 Jan, 2015 at 4:50 PM