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I've just completed a 'Loophole' but I'm having an issue where both the red and green LEDs are illuminated when in Record mode. Play mode seems to be fine, only the green LED lights up. I've had a look to see if I had a solder bridge between the LED connector pads but it doesn't seem to be the problem.. not 100% though. Please excuse my terrible soldering job, this is my first project using an etched board! Everything else works apart from the detune momentary switch because I think I may have overheated one of the pads. The LED thing isn't the end of the world but I just thought I'd post in case anyone had any ideas? Thanks

Any updates on when the new releases/restocks might be going up?

Hi guys, I'm looking to perform the calibration described here but I'm a total noob when it comes to oscilloscopes and I'm looking to pick one up. I've been looking at those hand held, DSO211/212 or similar ones and was just wondering if these will do the job? Are there things I should look out for in the specs/features that tell me if they are up to the task? Here's a link to one I'm looking at.. https://ebay.us/lxii5V

That last one is the cheapest, nastiest one I've seen. Here's another one I'm considering.. still cheap but not quite as nasty? https://ebay.us/KFFPyW

Any help much appreciated!

Just wanted to thank you for taking the effort to work this out and share your results!! I actually had my first attempt at doing the calibration by ear today. Although it went fine I do suspect it's capable of sounding much better, so when I came across your post I thought I might give this a try. I haven't had any experience with oscilloscopes etc but I'm feeling brave!!

You mention connecting a 47k resistor in series with the existing 82k.. would it be easier/neater if I just removed the 82k and replaced with a 150k or similar value?

Thanks again and wish me luck