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Feel pretty daft but I had the regulator the wrong way round. The blame lies squarely on the bad datasheet for this one, if it's the bottom view of a TO-92, write it next to the pin configuration so numpties like me will see it .

I'm still getting just +16.9v from the "+18v output" when using the 15v regulator, if anyone else has built this, is that as good as I'm likely to get?

Hi everyone,

Just built the 2019 version of the road rage with an LT1054 and 78L15 15v regulator for my prototyping board and I think my voltages might be a bit off.

With no load I'm getting:
+9.0v (unregulated +9v output)
+8.8v (regulated +9v output)
+13v (between D3 and D4)
+16.2v (+15v output)
+16.9v (+18v output)
-8.8v (-9v output)

My first thought is to swap the regulator out but any other ideas if/where I should start troubleshooting? I remove the regulator presumably I should get +/-18v if everything else is working? Though I would ask before I start ripping apart the circuit.

Thanks for you help.

Update: I went ahead and removed the regulator and now I get +17.5V (+18v output). Seems a bit more like it. Never heard of problems with regulators, but I'm going to breadbaord a few to check.

Appreciate the reassurances. Never opened one up so wasn't sure!

Thanks. Really wasn't sure. I know without the road rage circuit it's a bad idea to breadboard with a power supply. If there was a short to ground and no quick fuse on the power supply it would almost certainly do some damage. A battery on the other hand would just drain really fast.

Hi Everyone,

Just getting back into pedal building after a long break!

I decided to build a prototyping rig as described in the madbean tutorial and have used the Road Rage circuit to give me the different voltages +9, +15 , +18, -9v DC etc.

My question, and possibly a daft one, is whether it is safe to power this breadboard/rig with my isolated power supply or if I should stick with using a 9v battery?

I know the road rage charge pump circuit has polarity protection but I'm not sure if this helps if I short something by accident while breadboarding. Dont want to mess up my power supply.

Thanks for your help!