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Author Topic: Pulse DC 60 htz  (Read 4656 times)

Offline Artic_Knight

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Pulse DC 60 htz
« on: January 01, 2009, 12:49:17 AM »
im trying to achieve a 60 htz or close dc pulse current for motor experiments. ive seen the 555 timer curcuit setup but what baffles me is there is not some thing simpler on the web that can easily scale up? ie 1/4 curcuits vs 100 watt curcuits.

perhaps the 555 timer is the way to go atleast for lower voltages but i wanted to see if anyone has a curcuit that may be more scaleable and simpler? a couple of mosfets tied together with a resistor for eg.

i tried to use the joule thief curcuit but unfortunately it generates a more solid current than pulse current. perhaps some inherent leakage from the transistor. also it pulses a bit too quick.

thanks for any ideas!

Free Energy | searching for free energy and discussing free energy

Pulse DC 60 htz
« on: January 01, 2009, 12:49:17 AM »

Offline Yucca

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Re: Pulse DC 60 htz
« Reply #1 on: January 01, 2009, 02:50:55 AM »
Hi,

assuming you have 60Hz 120V wall current you can use 3 resistors accross the mains live and neutral like this:

(LIVE)-----[ 470k ]----[ 47k ]----[ 470k ]----(NEUTRAL)

the signal accross the 47k will be approx 6V AC.

use that signal to drive the gate of an N channel FET like IRF730:

connect -ve pole of your DC supply to one side of the 47k.
connect the FET gate to the other side of the 47k.
connect -ve pole of your DC supply to the FET source.
connect your load (pulse motor) accross +ve pole of supply and FET drain.

if you need to increase the rise and fall time of the pulses then put a FET driver IC before the gate.

Yucca.

Offline Artic_Knight

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Re: Pulse DC 60 htz
« Reply #2 on: January 01, 2009, 04:10:59 AM »
thanks! thats a very good tip that i will use.

do you by chance know of a simple way to do it from dc? such as a battery or cap? i know of the 555 timer but i was thinking some arangement of mosfets was possible i was just not able to figure it out myself. something easy i could do with current parts.

good info thanks for the response!

Free Energy | searching for free energy and discussing free energy

Re: Pulse DC 60 htz
« Reply #2 on: January 01, 2009, 04:10:59 AM »
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Offline Yucca

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Re: Pulse DC 60 htz
« Reply #3 on: January 01, 2009, 04:27:53 AM »
Easiest to use 555 and have that drive an N channel FET gate.
With 556 (2 x 555) you can also implement PWM.

if you wan´t to build your own then google "2 transistor astable multivibrator" you can vary the on time and off time, can use any general purpose transistors at that freq like 2n4401 etc. can drive a FET gate with the oscillator output.

Offline Artic_Knight

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Re: Pulse DC 60 htz
« Reply #4 on: January 01, 2009, 04:55:17 AM »
thats fantastic, youve been very helpful! thanks a bunch!

Free Energy | searching for free energy and discussing free energy

Re: Pulse DC 60 htz
« Reply #4 on: January 01, 2009, 04:55:17 AM »
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Offline pese

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Re: Pulse DC 60 htz
« Reply #5 on: January 01, 2009, 12:17:45 PM »
thats fantastic, youve been very helpful! thanks a bunch!

Use this:
(LIVE)-----[ 470k ]----[ 470k ]----[ 47k ]----(NEUTRAL/Ground)
Phase  120v         66 v          6v                  0volt

Think about this: 
6 VAC have Sinus-top point at about 10Volts

If using instead 47k resistor an 47k variable resistor
(47k linear pot), you can vary the output .



Pese

Offline Yucca

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Re: Pulse DC 60 htz
« Reply #6 on: January 01, 2009, 03:07:23 PM »
Use this:
(LIVE)-----[ 470k ]----[ 470k ]----[ 47k ]----(NEUTRAL/Ground)
Phase  120v         66 v          6v                  0volt

Think about this: 
6 VAC have Sinus-top point at about 10Volts

If using instead 47k resistor an 47k variable resistor
(47k linear pot), you can vary the output .

Pese

Good point Pese, that would also give control over duty cycle. A really simple PWM circuit!

I suggested (live to neutral) instead of (live to ground) to prevent house circuit breaker from tripping, but at that high resistance it probably will not leak enough to ground to trip anyway.

Yucca.


Free Energy | searching for free energy and discussing free energy

Re: Pulse DC 60 htz
« Reply #6 on: January 01, 2009, 03:07:23 PM »
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Offline jadaro2600

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Re: Pulse DC 60 htz
« Reply #7 on: January 29, 2009, 01:53:05 AM »
Just use the rectified AC / half wave rectification.

Or create a pulse circuit with the 555 timer and use a darlington pair or a transitor to open a channel up for a solenoid switch that supplies higher power.


 

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