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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors (Moderators: Eugene52, xavier, GoldDigger1950) >

NI Multisim

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xavier Topic starter

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	NI Multisim « on: September 19, 2013, 02:34:52 am »

Hello everyone

Is there any one that can help me with the NI Multisim simulator? I want to simulate a colpitts oscillator and a receiver but I'm not having any joy.

All the best
Xavier

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	Re: NI Multisim « Reply #1 on: September 19, 2013, 04:18:01 am »

Try here:

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http://www.ni.com/white-paper/4211/en

Is there some reason to use a Colpitts? Come on. You can tell me. I'm your friend.

Want some candy?

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	Re: NI Multisim « Reply #2 on: September 19, 2013, 05:29:47 am »

GD you make me laugh thanks for the link, the only reason why I'm using the colpitts is because I like that oscillator and it's stable enough for what I want to do. (I'm using it in my two box detector)

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	Re: NI Multisim « Reply #3 on: September 19, 2013, 06:06:51 am »

Stable? It's a mixer for modulation and the input causes it to modulate as FM. I suppose if you tie the modulation input to a level you'd be all right but if you want stability, nothing is better than a crystal oscillator and, they're cheap. One part. Nothing else needed.

Look here:

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http://www.allelectronics.com/make-a-store/item/CRX-103/10-MHz-CRYSTAL-OSCILLATOR/1.html

Get one of those and use a digital frequency divider (4000 or 74LS) series to bring it to your needs. Rock stable. Or, don't buy one. Send me your postal address and I send you a couple. The usual charges will apply.

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	Re: NI Multisim « Reply #4 on: September 19, 2013, 11:28:39 am »

Ha yes seen them before just never thought of using one yet. For now I'll stick with my colpitts, see how the machine performs then I may just redesign it, hell got nothing better to do with my time any way. LOL

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	Re: NI Multisim « Reply #5 on: September 22, 2013, 06:35:32 pm »

Ah yes.... The ole capacitor voltage divider feedback!

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	Re: NI Multisim « Reply #6 on: September 25, 2013, 11:22:38 am »

	Quote:	Posted by Mudflap
Ah yes.... The ole capacitor voltage divider feedback!

I just cant help but to like it LOL Now if only I knew how to get the NI Multisim to do the simulation.

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	Re: NI Multisim « Reply #7 on: September 25, 2013, 07:02:17 pm »

Yea.... Ok.... Go ahead and use the Colpitts. We can't change your mind anyhow. Next thing GD will want you to get is a rubidium reference standard, 42 pounds of TTL chips, maybe a lighthouse and 2 klystrons so you can get a hacked up fake sinusoidal waveform full of harmonics, ringing and noise...... Whoops ... time for another brewsky...... just kidding. Exhausted

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	Re: NI Multisim « Reply #8 on: September 26, 2013, 04:42:56 am »

I don't know what it is that you've been taking but it sure has a good effect on you Grin

That oscillator that GD mentioned is something that I want to start playing around with in the very near future, so it has NOT been excluded from my designs.

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	Re: NI Multisim « Reply #9 on: September 26, 2013, 05:47:57 pm »

They now have some neat packages for oscillators. You can get whole shooting match on a chip. TCXO, PLL, programmable dividers..... Last time I build a synthesizer (TTL days) I had about 15 ICs just to get a PLL wave at 50Mhz. Now all ya just add is Vcc, gnd, variable DC VCO control, and output a beautiful PLL sine (almost) wave with super accuracy. I'm sure GD can suggest a few.

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