Design Question
Thanks for the reply, you seem very knowledgeable in this area. I appreciate the time you are taking and will repost any breadboarding or schematics i come up with eventuallr so that others on this forum can benefit from this design.
1. I have a variable frequency external input ( clock?)
2. i can only darken one bit at a time and they are always in sequence (rotary knob)
3. the other Mux has a number of high speed optorelays as the ultimate destination (6)
SO the intention is to be able to vary the frequency of the pulses coming in (might even be used as the clock signal?) and control the pulse width on each based on the single dark bit position of A1
A2 is used to send this variable freq, PW signal to M1 - M6 based on the dark bits created by another selector switch so many of the channels in that A2 chip will be unused.
From what i can see with multiplexers the ABCD binary table determines which of the 16 channels have their switches closed... i dont get it, i thought the 16 channels were the inputs.
Why cant the 16 channels stay off and use a lit channel as the signal ? any idea why this guy did that? some sort of fail safe, his patent says that if the LEDs burn out or fail the whole system shuts down for safety...I cant figure out how that would work... any web pages or datasheets you could point me to would be appreciated so i can figure out how this stuff works
with thw dark input one bit at a time, i figured i would google DAC's seems like that ia what is happening here, but im overwhelmed!
my application will be a 6 channel variable frequency PWM that has two rotary knobs controlled by a curtain that moves between an array of infrared or any other wavelength LED and its pickup sensor
When i turn Knob A1, i want to vary the pulse width or duty cycle.
When i turn A2 ( with detents on the knob) I want to be able to manually select an output M1 thru M6 using another curtain to block any of 6 LEds and their associated sensors. The response must be very quick as this control circuit might have applications in automation or robotics.
Is the circuit shown the best way to accomplish this end result given modern ICs that are available now?
i think that diagram is from 1990...
peace