Pulse motor circuit no. 1

Works change coil ratio

What should those setting be? Nothing makes a difference when I experiment with it.

There are notes in the top half of the modified circuit explaining things (and a link back to this circuit). http://everycircuit.com/circuit/6194147947708416

Thanks for your help Richardc, I'm going to repost your original comments here to help this thread make sence. ========== One of the issues you had was that you were simulating the magnet passing the coil with DC. As the magnet passes one way a magnetic field builds then collapses, as it passes the other way an opposite magnetic field builds and collapses; this results in an AC signal. [Since the magnet passes the coil about once per second 1hz is suitable] The post mentions the coil should have a resistance of about 10 Ohm since we cannot add resistance to the transformer its split between two resistors. The transformers inductance and ratio are adjusted to get about 20mA across the LED.

To help make the second circut clear, in order to emulate a magnet passing a coil, I've added a AC transformer with no DC voltage that pulses across the coil in question 1s per second. In order to emulate the required resistance of the coil ( this is maniuplated by the AWG and number of turns ), we've simply added some artificial resistance to the positive and negative pulses in the form of 2 5 Ohm resisdtors. The only thing I'm unclear about is why the 31:1 turn count. How does that work along with the 'Coupling Coefficient' and 'Primary inductance'?

coupling is how close the coils are wound together, as a percentage. a coupling of 0.9 is closely wound together; coupling of 0.2 would be far apart, so the magnetic field interactions are not very close. the turn count is the ratio of turns on the primary vs. the secondary. since the transformer is idealised, the secondary inductance is the square of the turns ratio in henries.

in simulation the transformer component is used to simulate the magnetic field being introduced from the swinging magnet

l've benched a similar circuit to make a pendulum, I found that the gain on modern transistors is too high and the circuit goes into oscillation too easily, so dampen the gain by adding a resistor to limit the current going to the base of your drive transistor. a small capacitor across the collector to the base of the signal transistor also helps by integrating the signal, which shifts the phase enough to stop it from oscillating itself

Thank you for all your feedback @faceblast but I don't have the knowledge to translate your terminology. Which one is the drive and signal transistor respectively? It would be much easier to simply see what you mean, the language of electronics is still pretty confusing for me.

You're very welcome Vince. The drive transistor would be the one that drives (connects to) the coil (the top transistor); the signal transistor is the one that drives/signals (connects to) the other transistor (the bottom transistor).