Einstein
Temporal Engineer
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- 5,427
Thank you, @Einstein . Very informative and encouraging.
When I first received an HDR from Steven Gibbs, I placed a compass a various points around it to see how it would respond. Close to the end of the electromagnet, the compass would point away from the electromagnet, but in close proximity but at 45 degrees to either side of the end of the electromagnet, the compass spun like crazy - so fast it was just a blur and I cannot trust to guess what direction it was spinning in. Afterward I discovered that in this process the compass reversed polarity - it now points south. Oddly though, repetitions of making it spin has not reversed it back. With the HDR I assume this effect was caused by pulsed magnetic field. It may or may not be related to what you experienced with the sine/cosine coils, but comes to mind because of similar effect.
I would like to know how you generated signal at 90 degree phase offset from the other signal. That is my main stumbling block at the moment.
The sine-cosine signal was generated from a combination of integrated circuits. Most of my knowledge about IC's came from Radio Shack books. I used 3 basic IC chips. The 555 chip which I used to make the square wave pulses. It was ideal because it was cheap and allowed me to experiment up to a MHz of frequency. I fed the output of the 555 to the clock input of a 4017 CMOS chip. There is a schematic that shows how to configure the 4017 to a "count to N and then recycle" mode. I chose the count to 4 mode. The next IC was a 4001 CMOS chip. The 4001 chip has 4 independent gates in it. The circuit that was of interest to me was the RS Latch. I took the 4 output signals from the 4017 chip and fed them into two separate RS Latch circuits. Each RS Latch is comprised of two gates from the 4001 chip. Now comes the way I used the circuits to create a sine cosine square wave generator. The 4017 chip produces a sequential pulse from outputs 1 thru 4 then restarts the sequence. So I connected outputs 1 and 3 to the inputs of the first RS Latch. Then I connected outputs 2 and 4 to the second RS Latch. What this does is to create output pulses form one RS Latch that are 90 degrees apart in time with the second RS Latch. The outputs of the RS Latch circuits are connected to 4 Power Mosfets which in turn are connected to your 4 output coils. I would suggest you assemble this circuit on an experimental breadboard and play with it using LEDs to see how everything works at low speed.