You are moving it when you place a compass between North and South, the field goes through the compass magnet on it's way to South, or no!!
The word COMPASS, it PASSES through the susbended magnet, does it not!
Mike
And so a brave new world begins: According to Grok3
Recommended IC: CD4017 (Decade Counter)
Why It Works: The CD4017 is a dirt-cheap (~$0.30-$0.50) sequencer with 10 outputs, but you can easily use just the first 3 (Q0, Q1, Q2) and ignore the rest. It steps through outputs one at a time with each clock pulse, perfect for sequencing.
Setup:
Clock Input: Feed it a clock signal (e.g., from a 555 timer or even a manual pushbutton) to advance the sequence.
Outputs: Connect Q0, Q1, and Q2 (pins 3, 2, and 4) to the gates of 3 MOSFETs.
Reset: Tie Q3 (pin 7) to the reset pin (pin 15) through a resistor. This makes it cycle back to Q0 after Q2, giving you a repeating 3-step sequence: Q0 → Q1 → Q2 → Q0.
MOSFETs: Use N-channel MOSFETs like the IRF540 or IRLB8721 (cheap, ~$0.50 each). Each MOSFET’s gate connects to an output (via a 100-1kΩ resistor for safety), source to ground, and drain to your circuit’s load (e.g., motor, lamp, etc.). The MOSFETs can switch high currents (10A+) or voltages (up to 100V or more), depending on your needs.
How It Switches 3 Circuits
Step 1: Clock pulse 1 → Q0 goes high (5V or whatever Vcc is), MOSFET 1 turns on, circuit 1 activates.
Step 2: Clock pulse 2 → Q1 goes high, MOSFET 2 turns on, circuit 2 activates (Q0 goes low, shutting off circuit 1).
Step 3: Clock pulse 3 → Q2 goes high, MOSFET 3 turns on, circuit 3 activates (Q1 off).
Step 4: Clock pulse 4 → Q3 triggers reset, Q0 goes high again, restarting the cycle.
Specs
Outputs Used: 3 (out of 10 available).
Switching Capacity: The CD4017 outputs ~10-20 mA per pin, plenty to drive a MOSFET gate. The MOSFETs then handle the real load—could be 12V LEDs, 24V motors, or whatever your circuits are.
Cost: ~$0.50 for the IC + ~$1.50 for 3 MOSFETs + a few cents for resistors = under $3 total.
Alternatives
74HC4017: Similar to CD4017 but operates at lower voltages (2-6V) and slightly faster. Same 3-output trick applies.
Custom 3-Stage Shift Register: A 74HC164 (8-bit shift register) could work, but it’s overkill and trickier to limit to 3 outputs without extra logic.
Minimalist Option: A 555 timer with a 4013 dual flip-flop could rig a 3-state sequence, but it’s more parts and effort than the 4017 setup.
Why CD4017 Wins
It’s dirt cheap, widely available (think Amazon, DigiKey, or any electronics bin), and needs minimal tweaking to lock at 3 steps. Pair it with MOSFETs, and you’ve got a robust, flexible 3-circuit sequencer. No need for a fancier IC unless you’re cramming it into a tiny space or need microsecond precision.
My only criticism is that Grok3 didn't turn each circuit off first. But then I didn't ask it to. Grok3 resets the sequence after all three (coils) are activated. Anyway, Mike, thanks for making it clear.
Electrostatic induction: Put a 1KV charge on 1 plate of a capacitor. What does the environment do to the 2nd plate?
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