Pulsed DC Resonance Using Basic Stamp 2

[SkyWatcher]

Hi folks, awhile back in one of gotolucs threads, I recall making some experiments using a 555 timer to adjust frequency and pulse width while pulsing a coil.
Gotoluc was using a taillight bulb I believe and so i tried the same thing, though with the 555 timer, where as i think he had an h-bridge circuit.
i remember that when i adjusted the frequency and duty cycle, I could get the bulb placed on the negative input line to dim, almost completely, while an additional bulb placed either in series or parallel (don't recall at this time) with the primary coil was much brighter.
Though i was not using any capacitors on the primary coil.
I think finding the right frequency and duty cycle, that we can achieve a resonance effect, similar to what lee tseung is doing and many others.
These video clips explain it rather well, I think.
One shows pulsed DC from a pulse circuit and the other shows ac square wave from signal gen. doing the same thing, but a little better.
Pulsed DC 2 - YouTube
Energy Propagation - YouTube and these 2 videos from gotoluc highlight what I am experimenting with.
Effect of Recirculating BEMF to Coil test 6 - YouTube
Effect of Recirculating BEMF to Coil test 8 - YouTube

I am starting to make tests using the basic stamp 2 micro-controller, and i can adjust pulse width and duty cycle very precisely, within 2 microsecond increments.
Thought I would share my intent on the experiments to be tried.
Your thoughts welcome.
peace love light
tyson

edit: oh, I will be getting a new camera up and running soon, so i can take decent video of any interesting results.

[mbrownn]

Excellent.

What is the voltage range you can do?

This is an experiment I need to do but don't have the equipment.

[SkyWatcher]

Hi mbrownn, thanks for the reply.
I am using a darlington type pair, one npn and one pnp, 100 volt at 65watts maximum with the transistors I have on hand.
I will be using 12 volts to start with.
A 555 timer will do the same thing as my basic stamp 2 IC, though not as precisely as I will be able to tune it by computer programming.
peace love light
tyson

[mbrownn]

That should be More than enough, Did you watch the video on the PM I sent you?

It is established that we can have a high energy oscillation consuming little power in an LC circuit. The video shows a trifilar arrangement where the power is transferred to a motor without robing too much energy from the primary so it is able to maintain resonance while consuming minimum power. This needs to be tested because if true we have our Lockrigde trifilar coil and with the other things I have posted we should be able to complete a working device

[garrypm]

@mbrown,

video please. me too

[aaron5120]

Basic stamp 2 PWM

Hi mbrownn, thanks for the reply.
I am using a darlington type pair, one npn and one pnp, 100 volt at 65watts maximum with the transistors I have on hand.
I will be using 12 volts to start with.
A 555 timer will do the same thing as my basic stamp 2 IC, though not as precisely as I will be able to tune it by computer programming.
peace love light
tyson

Hi, tyson,
Thanks for telling us what you are experimenting with. I have problems of fluctuations of settings in PWM circuit made with 555s. When you adjust one parameter, the other parameter varies its value, so you have to re-adjust again. It is very time consuming.
Will you be so kind to post your schematics and the Basic code, or can you draw me to the place where I can buy a Basic Stamp2 PWM for this purpose?
I will be doing multiphase resonance with dual reluctance cores.
Thanks for helping.

[mbrownn]

@mbrown,

video please. me too

Ok fun with lcs - YouTube

I am not certain that this is it but it sure looks like it could be

[garrypm]

Thanks, Garry

[Keyos]

If you are fine with a pwm that range from 0 to 50% you could use a SG3525 chip, it require few external components, to set a frequency there is a combination of a resistor and condenser on 2 pins so you can use a trimmer instead of the resistor to change the frequency, than set the feedback pin to operate to the maximum pwm and to change it put another trimmer to the soft-start pin.

I had your same problem with the 555 timer and i switched to the SG3525, if you have to drive a mosfet this chip is already made to drive them on the 2 output pins.

It was used for inverter circuits or dc/dc converters so the output stage are 2, 180 degress out of phase each other but if you have to drive a single transistor/mosfet on a single coil than just use one stage at your choice.

[john_g]

Hi, tyson,
Thanks for telling us what you are experimenting with. I have problems of fluctuations of settings in PWM circuit made with 555s. When you adjust one parameter, the other parameter varies its value, so you have to re-adjust again. It is very time consuming.
Will you be so kind to post your schematics and the Basic code, or can you draw me to the place where I can buy a Basic Stamp2 PWM for this purpose?
I will be doing multiphase resonance with dual reluctance cores.
Thanks for helping.

Re resonance, I read the other day that creating a third harmonic of the fundamental frequency will give more current within a resonant circuit; maybe the experts would like to comment?

Regards

John

[wrtner]

Re resonance, I read the other day that creating a third harmonic of the fundamental frequency will give more current within a resonant circuit; maybe the experts would like to comment?

Regards

John

I would have thought that a circuit will have a resonant frequency,
and that drving it at that frequency will work well. Also, driving it
at its octave up the scale (i.e. double the frequency) or down the
scale, (i.e. half the frequency).

Imagine the metaphor of the child on the swing. Giving a push at
its frequency is good, or half the frequency, i.e. every other
swing. Nothing else is going to contribute as well.

But why not try and see!

[aaron5120]

If you are fine with a pwm that range from 0 to 50% you could use a SG3525 chip, it require few external components, to set a frequency there is a combination of a resistor and condenser on 2 pins so you can use a trimmer instead of the resistor to change the frequency, than set the feedback pin to operate to the maximum pwm and to change it put another trimmer to the soft-start pin.

I had your same problem with the 555 timer and i switched to the SG3525, if you have to drive a mosfet this chip is already made to drive them on the 2 output pins.

It was used for inverter circuits or dc/dc converters so the output stage are 2, 180 degress out of phase each other but if you have to drive a single transistor/mosfet on a single coil than just use one stage at your choice.

@Keyos, thanks for the tips! I will try this cricket.

[aaron5120]

resonance

I would have thought that a circuit will have a resonant frequency,
and that drving it at that frequency will work well. Also, driving it
at its octave up the scale (i.e. double the frequency) or down the
scale, (i.e. half the frequency).

Imagine the metaphor of the child on the swing. Giving a push at
its frequency is good, or half the frequency, i.e. every other
swing. Nothing else is going to contribute as well.

But why not try and see!

I think that is called in EE "parametric oscillation". "Hit me twice and I will slap you once!"
Now add to that the phase shifting of several inputs and you will get a complex response from the circuit.

[wrtner]

I think that is called in EE "parametric oscillation". "Hit me twice and I will slap you once!"
Now add to that the phase shifting of several inputs and you will get a complex response from the circuit.

Oh, no. you have me wrong. I am talking about an adult standing
on the ground, giving a push at the right time.

I am pretty sure "parametric" means that the nature and
quantity of the push itself alters. i.e. when the child is
throwing his/her weight around in order to get more height.

If, instead of the child, you had a rotating turntable with a large
out of balance mass on it, placed on the swing seat, this is
parametric oscillation.

[SkyWatcher]

Hi folks, thanks for looking at me thread.
@wrtner, and the typical secondary back field is another child swing beside the first, which is connected by the magnetic field.
This secondary field needs to be in synch, or it will restrict the free flow movement swing of the first child on swing.
Then we can use the volt/amps of the secondary without reflection to first child in joy, hehe.

@aaron5120, I ran into some issue with the code, when i try and use the pause command along with pulsout, it seems i can't get the pulse speed, maybe certain commands slow the processor down too much. So, I am trying to figure out what code will work properly. kind of a newbie to the programming.
Duty cycle adjustment is a necessity for this to work.

peace love light
tyson