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advanced modulator doesn't work in multisim

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tritium

Sun Jan 17 2010, 10:14AM

Registered Member #2591 Joined: Fri Jan 01 2010, 11:58AM
Location: netherlands
Posts: 76

hello guy's,
I have drawn the simple AUX circuit (advanced modulator from eastern voltage research) in multsim, if I put the scope on it i get an constant 5 volt output to the scope, powersupply is 9V,

does annybody know's what Im doing wrong?

if it work in multisim, then I can see what happens to the pulses and connect the pot.meters correct when I start to build the interrupter.

doctor electrons

Sun Jan 17 2010, 02:18PM

Registered Member #2390 Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381

Post a screen shot. That would help everyone see exactly what you have going on

tritium

Sun Jan 17 2010, 06:25PM

Registered Member #2591 Joined: Fri Jan 01 2010, 11:58AM
Location: netherlands
Posts: 76

here is a picture scan of the multisim/schematic

doctor electrons

Sun Jan 17 2010, 10:04PM

Registered Member #2390 Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381

In the shot you have there, the dc voltage of your supply is set to 5v.
Double click on it and change the output value to 9vdc and see what you get.

tritium

Mon Jan 18 2010, 06:15PM

Registered Member #2591 Joined: Fri Jan 01 2010, 11:58AM
Location: netherlands
Posts: 76

yes, that is because I was playing with it, I tought it was maybe a cmos device, so I changed to 5 volt (maybe the software will kill the device)

, but also on 15 volt or 9 volt I get an continue output of 5 volt, nothing is oscilating.

but for this, the only thing wat I want to know, is that if I have the pot. meters turned to the left (minimal prf/ms/us/pw/dwell/lock-out) where the arrow will be in the schematic's, up or down.

HV Enthusiast

Mon Jan 18 2010, 06:38PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

1. Does Multisim require a ground node? I know PSPICE does?

2. Are you doing a transient analysis? If just doing a bias point analysis, then all you will see is a DC voltage.

3. Is the 555 model even a working model?

doctor electrons

Tue Jan 19 2010, 12:01AM

Registered Member #2390 Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381

Multisim does require a ground node to run simulations. I should have caught that!
If multisim detects a problem with your circuit it will stop the simulation and your scope or meters "may"
lock at the last working measurement. When you hit the "play" button to run the simulation, if there is a problem, it
will open a dialog box that tells you the problem and/or problem area. If you pulled the 555 out of the built in component
list then it should be just like the real deal. If you just drew it in and named the pins without giving any parameters, it will not
do anything.

Steve Conner

Tue Jan 19 2010, 10:50AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

I'm going to quote Bob Pease here... If the real circuit didn't work but the simulation did, would you complain to Multisim?

EVR is a professional engineer, so he should have documented which way to turn every pot on the schematic and PCB artwork.. (yes that's a joke, this is hardly ever done in industry and I wish it was

)

tritium

Tue Jan 19 2010, 04:39PM

Registered Member #2591 Joined: Fri Jan 01 2010, 11:58AM
Location: netherlands
Posts: 76

@evr,
1 no, it is oscilating when I draw an other circuit like the PRF Adjust
2 don't know, because I'm working with this software fore one week now, gonig to try if there are options in the software
3 yes, see 1

but you are the men in this one, can you tell me where the arrow should be stand in the drawing versus stand of potmeter?

HV Enthusiast

Tue Jan 19 2010, 09:14PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

Steve McConner wrote ...

I'm going to quote Bob Pease here... If the real circuit didn't work but the simulation did, would you complain to Multisim?

EVR is a professional engineer, so he should have documented which way to turn every pot on the schematic and PCB artwork.. (yes that's a joke, this is hardly ever done in industry and I wish it was

)

Oh no! Not Bob Pease please!

wrote ...

@evr,
1 no, it is oscilating when I draw an other circuit like the PRF Adjust
2 don't know, because I'm working with this software fore one week now, gonig to try if there are options in the software
3 yes, see 1

I've had mixed luck with 555 timers using PSPICE - mostly because the models are usually hit or miss.
Your best bet is simply to wire it up on the bench and play around with it there. Also, the equations are very simple for a 555 so a simple excel sheet should provide the information you need.

wrote ...

but you are the men in this one, can you tell me where the arrow should be stand in the drawing versus stand of potmeter?

To quote Bob Pease again, "If i actually knew *what* you were talking about here, i'd surely answer your question. Proper english goes a long way to clear up confusion."

Czar

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