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Registered Member #9614
Joined: Mon Jan 14 2013, 10:00PM
Location:
Posts: 44
It's the third revision of his drivers, not to be confused with the UD's. This version looks to have phase lead over his last universal driver. Though it's almost identical to a UD2.1/2.5 with a pulse width limiter.
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Badly drawn circuits usually mean bad design A circuit should flow and not grate on the nerves I note 1n5819 s why not UF 1n4007 followed by a transil to clip the inevitable rogue pulse at some extended voltage that is going to turn the OCD amplifier into silicon oxide. I started bottom left of the SCH and stopped there after seeing that, bound to be more gotchas in the rest
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
johnf wrote ...
... I note 1n5819 s why not UF 1n4007 followed by a transil to clip the inevitable rogue pulse at some extended voltage that is going to turn the OCD amplifier into silicon oxide. ...
Yeah, he seems to be relying on the diodes to have sufficient internal impedance to damp the leading edge current spikes. Putting a resistor in series and capacitor in parallel to form a low pass filter would be far more effective than leaving them both in parallel.
Edit: and on further inspection, the lower MOSFETs on the deplorably drawn H-Bridge lack pull-down resistors.
Edit 2: (I should really stop looking at this circuit) When the feedback isn't connected / high impedance the 100k potential divider will pull the voltage on the NOT gate to ~2.5V which is on the borderline of being indeterminate.
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Franzoli electronics UD 3.0
