Sharing ideas on how to make a more efficent motor using Flyback (MODERATED)

[itsu]

None,  i have only 1 driver in, U2 which now is a non-inverting one (ucc37322).
Q1 is directly being driven by the 555 via a 50 ohm resistor.

Itsu

[verpies]

OK,  i did not succeed in getting the signals right by using 2 555 timers, as the wrong side of the pulse was moveable.

See this sim of two 555 working without inverting drivers.

I did not complete the full drain circuits of Q1 and Q3 - I just completed their gate circuits.
The adjustment of the astable pulse width is done by varying the 22K resistor and the monostable pulse width is done by adjusting the 21K resistor.
( Yes, I know that changing that 22K resistor will change not only the pulse width/duty cycle, but it will also change the frequency of the entire astable waveform - that's why I hate working with these 555s and why people come up with such monstrosities as in Fig. 4.4.8 )
BTW: The "out" labels what is shown on the sim scope.

[itsu]

Thanks,   the signal coming out of my first 555 is inverted from yours, so i have a 40Hz @20% positive duty cycle while you have a 80% or so positive duty cycle.
I need to see if my pots can be adjusted enough to match your 80%, i thought i tried that already, but am not sure what happened.

But don't spend to much time on this as i have ordered some 4047's.

Regards Itsu

   

[verpies]

Thanks,  the signal coming out of my first 555 is inverted from yours, so i have a 40Hz @20% positive duty cycle, while you have a 80% or so positive duty cycle.

Inverted without an inverter?
According to datasheets, the 555 is incapable of outputting less than 50% duty cycle in its classical astable configuration.  That's why people come up with things like in Fig. 4.4.8

Anyway, the high duty cycle of the astable (>80%), suits well the requirements of the Q3 drive.

[itsu]

Inverted without an inverter?
According to datasheets, the 555 is incapable of outputting less than 50% duty cycle in its classical astable configuration.  That why people come up with things like in Fig. 4.4.8

Anyway, the high duty cycle of the astable (>80%), suits well the requirements of the Q3 drive.

Yes, no inverter after the first 555 timer, see this video at the 2:20 mark where i have the raw output of the first 555 timer on the blue probe/trace (connection goes at the back side of the pcb also to the yellow wire)

https://www.youtube.com/watch?v=9klpMi8zeLU&feature=youtu.be

I use this diagram for the first 555:
http://www.electroschematics.com/5834/pulse-generator-with-555/


Itsu