My LM350 regulator with smoothing caps (C1:0.33uF, C2:1uF polarized, R1:150 R2:10ohms+trimpot) does not work. It works without capacitors. I am an idiot. What have I done wrong? I tested all the connections, and they match up fine with the diagram. On Vout, there is briefly a nice voltage, then it drops. When I retest with my DMM a few moments later, the voltage is up again, then it drops.
What is wrong? Hit my stupid skull with your cluebats!
Edit: Had the same problem with a LM317 voltage regulator. I 'fixed' it by removing the caps. But I really want to know what I'm doing wrong here. The LM350 is confirmed working - without those caps.
Edit2: This question has been answered by @sstobbe. I had a bad solderjoint in an inconspicuous location. Thanks for your time everyone.