Author Topic: How to ... transform DC to AC? (Read 3468 times)

microcontroller · « **Reply #15 on:** February 19, 2012, 02:02:34 PM »

If you want be able to regulate or control the output voltage i suggest you use a microcontroller with PWM function you can control the output voltage.
but now i'm totally lost as to what you want to do so i'm out.

Free Energy - Freie Energie - energia libre - OverUnity.com · « **Reply #15 on:** February 19, 2012, 02:02:34 PM »

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poynt99 · « **Reply #16 on:** February 19, 2012, 02:54:38 PM »

Quote from: UTiLeeTY on February 19, 2012, 11:32:05 AM

Whoa! Thank you for awesome curcuits !

But, how could I manage to regulate 'AC impulses' from say ...
an AC generator coil, which then go into one of both transistors (say: NPN on & PNP off - positive, NPN off & PNP on - negative) and produce output voltage depending on "polarity" of outgoing FET?

Thank you for your time & curcuits .

UTiLeeTY

Sounds like you will need to stabilize your input first, and you can do this by full wave rectifying and filtering (large capacitor) the fluctuating input. Then you'll have a more stable DC source to start with.

To now convert to AC, you can either do so using a cheap and dirty inverter, or have the DC source power a function generator that is run through an amplifier stage. It depends on how clean an AC voltage you want, and what frequency. With a function generator/amplifier, you have more flexibility in controlling the output amplitude, frequency, and type of wave form.

.99

Free Energy - Freie Energie - energia libre - OverUnity.com · « **Reply #16 on:** February 19, 2012, 02:54:38 PM »

UTiLeeTY · « **Reply #17 on:** February 19, 2012, 02:55:03 PM »

Quote from: microcontroller on February 19, 2012, 02:02:34 PM

If you want be able to regulate or control the output voltage i suggest you use a microcontroller with PWM function you can control the output voltage.
but now i'm totally lost as to what you want to do so i'm out.

Hmm ... I just want to use a NPN and PNP transistors as switches, which do work one after another ...

A rectified (by diode) AC generator coil/s current should be my input on FET for turning on or off an available DC voltage (such as 12VDC from battery).

Like, a) PNP is off, 2nd AC input is off & NPN, using 1st rectified AC input, is on
b) same NPN do create positive (12VDC) pulse
c) then NPN goes off (because of no 1st AC input) & now PNP goes active mode
(because 2nd AC input is on)
d) same PNP produces negative (12VDC) pulse
e) go back to a)

In theory, that should work well ... but how may I import that into a working circuit, please :S?

Best Regards,

UTiLeeTY

Groundloop · « **Reply #18 on:** February 19, 2012, 05:18:18 PM »

Quote from: UTiLeeTY on February 19, 2012, 02:55:03 PM

Hmm ... I just want to use a NPN and PNP transistors as switches, which do work one after another ...

A rectified (by diode) AC generator coil/s current should be my input on FET for turning on or off an available DC voltage (such as 12VDC from battery).

Like, a) PNP is off, 2nd AC input is off & NPN, using 1st rectified AC input, is on
b) same NPN do create positive (12VDC) pulse
c) then NPN goes off (because of no 1st AC input) & now PNP goes active mode
(because 2nd AC input is on)
d) same PNP produces negative (12VDC) pulse
e) go back to a)

In theory, that should work well ... but how may I import that into a working circuit, please :S?

Best Regards,

UTiLeeTY

@UTiLeeTY,

Why don't you make a simple drawing on what you want to do?
A drawing says more than 1000 words. :-)

GL.

Free Energy - Freie Energie - energia libre - OverUnity.com · « **Reply #18 on:** February 19, 2012, 05:18:18 PM »

microcontroller · « **Reply #19 on:** February 19, 2012, 06:12:24 PM »

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?

there are several ways to do this analogue and digital.
what other needs are there like phase control or duty cycle control voltage control you were speaking about regulation so what needs to be regulated since if you only want to synchronize you don't have any freedom or control it will simply be a repeater.

UTiLeeTY · « **Reply #20 on:** February 19, 2012, 07:43:28 PM »

Quote from: microcontroller on February 19, 2012, 06:12:24 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?

Quote from: microcontroller on February 19, 2012, 06:12:24 PM

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 - Freie Energie - energia libre - OverUnity.com · « **Reply #20 on:** February 19, 2012, 07:43:28 PM »

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microcontroller · « **Reply #21 on:** February 20, 2012, 01:25:13 AM »

You need to match the voltage of your incoming signal to fit the turn on voltage of the mosfet gates.
The best way to do this is to make it TTL or CMOS compatible via ADC and write a small program to do the job.

But since you are only trying to trigger your mosfets in sync with your input signal you might succeed by using trigger windings and half wave rectification but do realize you have no means of controlling anything with this setup it just fires whenever your input is high.

now to say you don't know how to connect them properly it's quite simple if you use a center tapped primary you do not have to use PNP and NPN you can go with two NPN's and connect the center tap to 12+

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.

Free Energy - Freie Energie - energia libre - OverUnity.com · « **Reply #21 on:** February 20, 2012, 01:25:13 AM »

UTiLeeTY · « **Reply #22 on:** February 20, 2012, 02:53:18 PM »

Quote from: microcontroller on February 20, 2012, 01:25:13 AM

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

Free Energy - Freie Energie - energia libre - OverUnity.com · « **Reply #22 on:** February 20, 2012, 02:53:18 PM »

microcontroller · « **Reply #23 on:** February 21, 2012, 05:45:16 AM »

you mean like this?

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

Also check out these circuits http://www.falstad.com/circuit/e-index.html

And you can build your own too.
If you build what you have in mind you can export the file and upload it here so we can check it out.

Free Energy - Freie Energie - energia libre - OverUnity.com · « **Reply #23 on:** February 21, 2012, 05:45:16 AM »

UTiLeeTY · « **Reply #24 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

,

UTiLeeTY

Free Energy - Freie Energie - energia libre - OverUnity.com · « **Reply #24 on:** February 22, 2012, 07:47:57 PM »

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Author Topic: How to ... transform DC to AC? (Read 3468 times)

Free Energy - Freie Energie - energia libre - OverUnity.com

Free Energy - Freie Energie - energia libre - OverUnity.com

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