Hi all,
I've drawn up a DPDT relay in Multisim 8, but there is no way to tell it the coil should be AC ! The relay "chatters" which is definately not what I want.
I can't just change it to use a DC power source either, AC is a critical factor. Any suggestions ?
Multisim actually appears to lack any method of making any component AC !
Regards, Chris
Relays in Spice are just (DC) voltage-controlled switches. For AC just write your own behavioral model ;-)
Or just add a peak detector in front of the relay model.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Thanks, but I'm only new to Multisim (or simulation software of any kind), so I would have no idea how to do either of those.
Regards, Chris
PEAK DETECTOR....
(DIODE) AC----|>|----+-------+-----? DC OUTPUT | | C R | | | | GND GND
I hate ASCII ;-)
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Jim Thompson a écrit :
Oh, one ascii drawing, that's not only conceptual but also works ?-)
Do you have any component value?
-- Thanks, Fred.
60Hz ?
Diode: 1N4148, 1N4001, what have you Capacitor: 1uF Resistor: 510K
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Jim Thompson a écrit :
510K? It's E24. I don't have that in my (spice) junk box.-- Thanks, Fred.
It's rather arbitrary... choose your ripple... what's in your junk box... 470K ?:-)
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Jim Thompson a écrit :
Not 470K anymore. These were carbon comp and have drifted a lot... I'd prefer an adjustable cap, but I can't find the model for a 1uF+ one. Oh, and the dial is really ugly.
-- Thanks, Fred.
kind),
That's some simulator... can't set values ?:-)
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Jim Thompson a écrit :
kind),
Hmmm, got you. I'll check if I can file the resistor down.
-- Thanks, Fred.
On Tue, 12 Sep 2006 18:59:13 +0200, Fred Bartoli
Surely, you'd file a resistor up (in resistance), not down. Sheesh, beginners!
Richard Kanarek a écrit :
I was of course speaking of diameter :-)
But now you remind me, I'm sure I have somewhere one of those (pretty rare) thickening files, so I could go either way.
-- Thanks, Fred.
I don't suppose anyone knows where to find a model for an AC relay ? Adding components to recifty it isn't going to help because the same live wire feeding the relay coil is also used to supply power to devices attached to the relay..
What I'm trying to simulate is the time delay relay from this diagram (a
1970's pepsi vending machine):The idea is that the relay stays closed for about 1.5 - 2.5 seconds after power is removed from the coil.. this is meant to hold the solenoid down long enough for a can to roll out of the machine.. without the cap, resistor and diode the relay cuts out way too fast and the solenoid springs back up before the drink can roll out..
The schematic is hand drawn by myself based on a very worn and faded diagram and a visual inspection of the wiring. I think the order of the components for the time delay is wrong because I get no voltage across the coil, and if I measure between one side of the coil and the diode, I get 56V AC.. The original relay was worn and the cap was leaking so I decided to replace it.. but it doesn't work..
Any help would be great.. if I'm in the wrong group then kindly point me in the right direction..
Regards, Chris
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