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Imagine this:

TK:

Congratulations on an excellent job!  Having an updated schematic is very much appreciated also.

Magluvin:

I told you not to engage with me and I mean it.  And your answer is close but not quite right.  When the rotor magnet is moving across the center of the large sense coil there is no change in total magnetic flux through the loop with respect to time so the EMF generated by the coil will be zero.  In this case it's EMF and not current that is the relevant parameter, there is no current flow through the coil.

I sent you an email that you read this morning telling you to remove your quoting of me in reply #88 and you didn't do it.

DO NOT ENGAGE WITH ME ON THE FORUM.

I made an exception in this case and responded to you, but it likely will never happen again.

MileHigh

A request for more help:

The 4017/555 system fires a very short pulse to the blue LED just at the moment of coil turn-on. It would be _awesome_ to have another strobe LED -- say a red or green one -- that fires just when the coil turns _off_. 

This then would allow full control and visualization of the dwell angle, or conduction angle as MH refers to it, without needing a scope ever.

But I can't quite figure out how to get a pulse at the turnoff time. My brain is fried at this point, creative juice is low. So I'm asking for some help from the audience. How can I get a pulse at the turn-off time that I can use as a strobe signal?


I have a hunch that the LM339N quad comparator chip might be very useful in this application. 

Hmmm...thanks, that would work I think. I'll see if I can rig it up. I have another 4017 chip, I think. And to save space a 556 dual timer could be used.

Can you think of a way to use the second op-amp in the TL082 instead of the NOT gate?

Hey TK:

I am really tired today so all I can offer is a Google search that looks pretty good, "555 falling edge trigger."  You might find some good circuits that demand as input a brief negative going pulse.  That might no be too compatible with what the comparator output is doing in the sense that it stays low for a "long" time.  However, to get around that you just need to put a small cap between the comparator output and the 555 circuit that expects a brief negative going pulse to trigger the monostable.  So the cap will couple the falling edge to the 555 trigger input.

Also, you put a pull-up resistor on the 555 trigger input.  (You may also want to put a diode connected towards +12 volts to snub out any over-voltage on the 555 trigger input when the comparator output transitions from low to high.)

So when the comparator output goes from low to high, the capacitor has roughly +12 volts on both sides and it's not charged.

Then when the comparator output goes from high to low, the 555 input sees that high to low transition and that triggers the 555 monostable to flash the second LED.   Then while the comparator output stays low the pull-up resistor charges the cap and the 555 is "satisfied" because it sees a HIGH on the trigger input again - i.e.; the 555 trigger input (possibly) only wants to see a very brief negative pulse that is much shorter in duration than the monostable output that flashes the LED.

Typically it's a very tiny capacitor that will do the trick.  Perhaps a 0.1 uF cap.  Then you might want the falling edge trigger to be low only for a few hundreds of microseconds.  So you choose an appropriate pull-up resistor using the RC time constant.

It's a "quasi kluge" that should work just fine, and all you need to implement it is a negative edge triggered 555 monostable circuit.

MileHigh

Hey TK:

I am really tired today so all I can offer is a Google search that looks pretty good, "555 falling edge trigger."  You might find some good circuits that demand as input a brief negative going pulse.  That might no be too compatible with what the comparator output is doing in the sense that it stays low for a "long" time.  However, to get around that you just need to put a small cap between the comparator output and the 555 circuit that expects a brief negative going pulse to trigger the monostable.  So the cap will couple the falling edge to the 555 trigger input.

Also, you put a pull-up resistor on the 555 trigger input.  (You may also want to put a diode connected towards +12 volts to snub out any over-voltage on the 555 trigger input when the comparator output transitions from low to high.)

So when the comparator output goes from low to high, the capacitor has roughly +12 volts on both sides and it's not charged.

Then when the comparator output goes from high to low, the 555 input sees that high to low transition and that triggers the 555 monostable to flash the second LED.   Then while the comparator output stays low the pull-up resistor charges the cap and the 555 is "satisfied" because it sees a HIGH on the trigger input again - i.e.; the 555 trigger input (possibly) only wants to see a very brief negative pulse that is much shorter in duration than the monostable output that flashes the LED.

Typically it's a very tiny capacitor that will do the trick.  Perhaps a 0.1 uF cap.  Then you might want the falling edge trigger to be low only for a few hundreds of microseconds.  So you choose an appropriate pull-up resistor using the RC time constant.

It's a "quasi kluge" that should work just fine, and all you need to implement it is a negative edge triggered 555 monostable circuit.

MileHigh

That's not a quasi-kludge, it's a fullblown grownup kludge.

Did you miss my post above, Analog Op-Amp Man?
 

The TL082 has two opamps in it and all that is needed is to reverse the inputs, put the reference voltage from the setpoint pot into the non-inverting input and the sense coil into the inverting input of the second opamp. It seems to work fine, so far.

@TK,


      This circuit looks like it may spring to life by lightning strike. Watch it now! Maybe your dog can help lick clean what's left of the peanut butter from inside the lid.