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OK, R2 it is. I'll get onto that.
Now what is R2 - cannot work it out from the photo - grey/green orange/brown orange? I'll have to pull the lid off again. But it's definitely orange - so maybe a 50 or 100k trimpot should do the trick.
If the pot at minimum gives me about 40% on-time, then reducing R2 value should reduce that below 40%. OK, I can play with that easily and check the results on the scope.
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