Well, this freaks me out! :-)

Actually that was even worse, the motor shaft just shatters back and forth makes no full turns. I tried by lowering the frequency in steps all the way down to 10Hz (from 625Hz), below 100Hz it moves but there’s no torque! I can stop it just by touching the shaft.

With the output on/off loop (first try) 2ms (and higher) delay the motor runs fine and there’s lots of torque. I only wish it was possible to run it faster.

Consulting the PBP manual I read;

”FREQOUT works best with a 20 or 40 MHz oscillator. It can also work with a 10 MHz osc and even at 4 MHz, although it will start to get very hard to filter and be of fairly low amplitude. Any other frequency will cause FREQOUT to generate a frequency that is a ratio of the actual osc used and 20 MHz.”

The last part didn’t really translate very well in the old brain; “a ratio of the actual osc used and 20 MHz.”.

Does this mean lots of harmonics and “dirt”, I do not have access to a scope where I am right now or I would have performed a ECG on it!


Thanks skimask!