Re: The "Sussex" Homebrew Valve Tester.
Martin
Found another small problem in that the 250mA QB fuse blows when RL1 energises. It is due to inrush current on C17, the original circuit with the current mirror did not have any decoupling on that side. Removing C17 avoids the fuse blowing. I have not noticed any instability with U1, the LR8 regulator when just relying on just the 220nF.
Andy
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