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'''What to measure and what to think about when running secondary trigger VR on a 3.2 or 3.3''' * is the correct solder jumper installed? ** SJX * is the sectrig LM1815 pin7 adaptive threshold RC circuit soldered on fine ? ** check the schematic ** Don't forget to '''look for missing components''', especially the 0805 resistor from LM1815pin7. 100 .. 180k is fine, or even a 0k short. * What signal does the LM1815 output to the AVR on IC3? ** Should be a 0/5V square waveform, only 5V for a short 60usec after the input negative going edge Make a report of your measurements. All pins.
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