Russ has been studying this patent which appears to be far easier than the Stan Meyer method.
I'd be curious if anyone has pursued it already or sees any obvious flaws.
Thanks much,
M@
Hi Matt
Well, built the small signal/logic control circuit from the patent today:
Please note that the patent drawing specify NAND gates x4 for 5a, 5b, 6a, 6b, but the written word says AND gates for the same parts.
I only have AND gates at the moment so my build uses the 'written' specified AND gates (SN74HCT08N).
The inverter used : SN74HC14, Schmitt
#4 is specified as a divide by 2 so I used the 'old' D type Flip Flop trick (SN74HC74N) , (Not Q0 -> d) and Clk as my input. Checked on Scope, divides by 2- works as advertised.....
#1 & 2, used my FG to have variable duty cycle as described in patent.
#3 is mentioned to be a 555 PWM circuit, but I whipped up a TL494cn with variable duty cycle and frequency control.
Please see scope shots:
Note that with both #1 & #3 set to 50% duty cycle the output 6a & 6b ( out of phase and with variable deadtime, adjustable by duty cycle on TL494) gives a constant variable changing duty cycle from maybe 8% to 50% on both channels. Kind of a neat effect if that's what your after. This is due the fact that the two PWM signal sources are NOT synchronized so the signals drift apart and then together..... The patent does not mention synchronization so I don't really know the intent of the author.
If the duty cycles are not equal ( between both PWM signal sources) then the last picture shows the expected mix-mash of signal.
I would appreciate any comments regarding this setup, if you notice something that I overlooked please advise.
I first downloaded this patent a number of years ago and promptly forgot about it, (like so many things ) but I do agree with Matt that this does hold promise and definitely less complicated than S.M. technology.
But, seeing the already apparent mis-information in the patent (maybe the patent lawyer translated the technical drawings?) , I doubt that all the pieces are there to replicate without some serious time invested....
take care, peace
lost_bro