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Author Topic: How to ... transform DC to AC?  (Read 41572 times)

Offline UTiLeeTY

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  • Posts: 22
Re: How to ... transform DC to AC?
« Reply #15 on: February 19, 2012, 07:43:28 PM »
You want two 12v pulses, one when the sine tops and the other when the sine bottoms is that correct?

So you want to synchronize your output pulses with your input signal is that correct?


okay i get it you have AC signal to start with.
You want two 12v pulses, one when the sine tops and the other when the sine bottoms is that correct?

So you want to synchronize your output pulses with your input signal is that correct?


 Yes :),
 
 exactly, it should run like that:
 
 there you do have 2 (rectified AC) coils for switch input, one attached to NPN and another goes into PNP transistor, 12 VDC battery and couple resistors.
 
 Then, if 1st AC coil gives an impulse (on/off) to NPN -> (+/-)12VDC pulse is active 
           if 2nd AC coil gives an impulse (on/off) to PNP -> (-/+) 12VDC pulse is active
 
 That way one can modulate an AC depending on active or inactive AC coil pulses.
 
 I just dont know how to connect them properly >_<, hope you can help :).
 
 Best wishes,
 
 UTiLeeTY
 

Free Energy | searching for free energy and discussing free energy

Re: How to ... transform DC to AC?
« Reply #15 on: February 19, 2012, 07:43:28 PM »

Offline UTiLeeTY

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Re: How to ... transform DC to AC?
« Reply #16 on: February 20, 2012, 02:53:18 PM »

If you decide to go with NPN and PNP you just turn around the diode so the target gate threshold pin get's a negative or a positive pulse.
Also be careful not to burn out your components because when a trigger winding is placed next to the output coil it will quickly destroy itself.

May I ask for a circuit diagramm, please :) ?

Edit: What would happen, if I simply connect 2 (rectified via diodes in 1 direction OR without diodes?) wires of a coil to the base of NPN transistor (as an positive input going through/no diode & connected to the base -> then outgoing wire of same coil from the base of NPN through/no diode to negative pole of a coil :O )?

Many Thanks,

UTiLeeTY
« Last Edit: February 20, 2012, 04:28:21 PM by UTiLeeTY »

Offline UTiLeeTY

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Re: How to ... transform DC to AC?
« Reply #17 on: February 22, 2012, 07:47:57 PM »
Hello again :),


that one is what I was looking for \ 0 / :

http://www.falstad.com/circuit/e-mosfollower.html

Thanks for epic links :thumbsup.

Now my questions:
- how may I even out -VAC and +VAC in that circuit (say -7V & +7V, sine wave)?

- is there a chance to build the same using NPN and PNP transistors?

Many Thanks  8) ,

UTiLeeTY

Offline Rafael Ti

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Re: How to ... transform DC to AC?
« Reply #18 on: February 23, 2012, 07:47:56 AM »
Hi UTiLeeTY
Maybe u need a simple AC emitter follower? There are two types of this setup; with single supply voltage or with two supplies +Ucc and -Uee.

Offline UTiLeeTY

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Re: How to ... transform DC to AC?
« Reply #19 on: February 23, 2012, 02:54:49 PM »
Hi UTiLeeTY
Maybe u need a simple AC emitter follower? There are two types of this setup; with single supply voltage or with two supplies +Ucc and -Uee.

Thank you for circuit, need to try that out later :).

Well, ... which one would you prefer for switching duty in your circuits:

Hall effect sensor

OR

Reed switch?

Like before, I plan to use my circuits under maximum 12VDC and 1A load
at frequency ... < 500Hz.

Thank you very much :).

UTiLeeTY

Free Energy | searching for free energy and discussing free energy

Re: How to ... transform DC to AC?
« Reply #19 on: February 23, 2012, 02:54:49 PM »
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Offline Rafael Ti

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Re: How to ... transform DC to AC?
« Reply #20 on: February 23, 2012, 04:26:00 PM »
Well, ... which one would you prefer for switching duty in your circuits:
Although some reed switches can operate up to 500 Hz I would suggest you to use the hall effect sensor. Just because of frequency. I think 500 Hz is to high for mechanic switches especially when they work continuously... Also using some types of hall effect sensors you can determinate the N & S pole of magnetic field and its sensitivity, which is impossible for reed switches.

Offline tabeta_03

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Re: How to ... transform DC to AC?
« Reply #21 on: March 18, 2013, 11:10:59 PM »
@TiLeeTY,

The attached 556 oscillator gives you control of both frequency and duty cycle.

GL.
Hello dear Groundloop and all ou members
I have a mini incubator at home that is working whit 12 volt AC - 1.5 amp and 10 watt this incubator has Thermoregulator borde&heater&Fan&Gear .i am trying to turned it on with 12v DC -5amp dry-cell battery but i need a 12v DC to 12v AC inverter and I made your attached 556 oscillator but that output is not AC i should connect pulse out to what for 12 volt and 1.5 amp ac output? I am not an electrical engineer i only connected the Parts form your map.pleas complete this attachment to 12vAC output for me.i love u and internet that i can connected to u whit it. :-*

Free Energy | searching for free energy and discussing free energy

Re: How to ... transform DC to AC?
« Reply #21 on: March 18, 2013, 11:10:59 PM »
Sponsored links:




Offline tabeta_03

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Re: How to ... transform DC to AC?
« Reply #22 on: March 18, 2013, 11:12:20 PM »
@TiLeeTY,

The attached 556 oscillator gives you control of both frequency and duty cycle.

GL.
Hello dear Groundloop and all ou members
I have a mini incubator at home that is working whit 12 volt AC - 1.5 amp and 10 watt this incubator has Thermoregulator borde&heater&Fan&Gear .i am trying to turned it on with 12v DC -5amp dry-cell battery but i need a 12v DC to 12v AC inverter and I made your attached 556 oscillator but that output is not AC i should connect pulse out to what for 12 volt and 1.5 amp ac output? I am not an electrical engineer i only connected the Parts form your map.pleas complete this attachment to 12vAC output for me.i love u and internet that i can connected to u whit it. :-*

Offline Groundloop

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Re: How to ... transform DC to AC?
« Reply #23 on: March 19, 2013, 04:37:34 PM »
Hello dear Groundloop and all ou members
I have a mini incubator at home that is working whit 12 volt AC - 1.5 amp and 10 watt this incubator has Thermoregulator borde&heater&Fan&Gear .i am trying to turned it on with 12v DC -5amp dry-cell battery but i need a 12v DC to 12v AC inverter and I made your attached 556 oscillator but that output is not AC i should connect pulse out to what for 12 volt and 1.5 amp ac output? I am not an electrical engineer i only connected the Parts form your map.pleas complete this attachment to 12vAC output for me.i love u and internet that i can connected to u whit it. :-*

tabeta_03,

The output from the 556 oscillator is not AC, you are 100% correct. You need to build the H-Bridge circuit also
and use the 556 oscillator as a input to the H-Bridge. The output of the H-Bridge will be 1/2 of the frequency
of the 556 oscillator. So your goal is to tune the 556 oscillator to 100Hz (or 120Hz) to get 50Hz (or 60Hz)
output from the H-Bridge. The output of the H-Bridge will be pulsed DC.

GL.

Offline forest

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Re: How to ... transform DC to AC?
« Reply #24 on: March 19, 2013, 06:20:25 PM »
I heard that it's possible to get very nice clean 50Hz AC pure sinewave using 4 mosfets bridge with a microcontroller setup. Is that true ?

Free Energy | searching for free energy and discussing free energy

Re: How to ... transform DC to AC?
« Reply #24 on: March 19, 2013, 06:20:25 PM »
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Offline Groundloop

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Re: How to ... transform DC to AC?
« Reply #25 on: March 22, 2013, 06:08:55 PM »
tabeta_03,

Here is the updated H-Bridge switch using the IR2111 driver.

GL.

 

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