Electronics > Projects, Designs, and Technical Stuff

Bob Widlar's hassler circuit

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mikerj:
I'd have thought a decent low pass filter on the input would be needed to prevent feedback latching things up?

ArthurDent:
Is this the Widler poster mentioned above?

IDEngineer:
One of the best posters ever - in ANY genre!

SiliconWizard:

--- Quote from: Dongulus on January 29, 2015, 01:34:57 am ---
--- Quote from: dannyf on January 28, 2015, 11:07:18 pm ---It shouldn't be hard:

1) configure a high-frequency pwm generator. its output to a mosfet via a resistor;
2) configure a low-frequency pwm generator. its output to the joint of the mosfet + resistor;
2) adc the input and use it to control the duty cycle of the low-frequency pwm generator;
3) done.

A 8pdip attiny should be sufficient. Or a 20 cent stm8.

--- End quote ---

I kid because Bob Widlar didn't hold a high opinion of digital circuits. In fact, he probably would have smacked me for suggesting such an idea.  ;D

--- End quote ---

Hehe, indeed. And anyway, designing this probably took him a lot less time than it would take even an experienced programmer to implement this on an MCU. (Almost guaranteed!)
Seems simple but the devil is always in the details, and it would probably take a few hours to get it working completely and reliably on an MCU. I bet Widlar designed his hassler in like 20 minutes top. ;D

SiliconWizard:

--- Quote from: ArthurDent on August 05, 2019, 05:58:07 pm ---Is this the Widler poster mentioned above?

--- End quote ---

Yes. I had it in my office a few years back. Ended up removing it because it was seen as offensive to some.
 ;D

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