Little Class D question

The Dragon · 8th May 2007, 11:44 AM

Dear members of this forum

I'm not studying electronics, but for some project at school they require us to make everything by us selfs.

I have this little scheme that describes a simple class D

my question is I can't simulate this thing because multisim does not have components like the BAT 54 diode, opamp AD8651 and the AC type shmitt-trigger (74AC14)

I wanted to simulate the effects of using different IC's to determine the fastest one or an equivalent IC if they don't have the one I need in the shop.

so my question finally is can someone simulate this for me or are there any programs for free that does have the required components?

btw: if anyone needs the scheme, just mail me

thanks in advance

fumac · 9th May 2007, 10:35 AM

u can use swcad III from LT
is great for class-d and other switch things
http://www.linear.com/designtools/so...witchercad.jsp

rg
fumac

The Dragon · 10th May 2007, 08:16 AM

it is a great program idd, but from what I have I'll need to modificate my scheme, because it does not have 74x IC's

kinda sucks, I was going to make it today and hope it goes well

Genomerics · 13th May 2007, 01:16 PM

There is an LTspice user group on Yahoo.... It's run by Helmut Sennewald who is a really helpful bloke.

http://tech.groups.yahoo.com/group/LTspice/

You have to join

Once you have then in the files section under lib.....

http://tech.groups.yahoo.com/group/L.../files/%20Lib/

You get lots of nice stuff including models for 4000 series and 74 series logic.

http://tech.groups.yahoo.com/group/L...al%2074HCTxxx/

I'll probably get this wrong but...... You put the .lib file into the LTspice library directory..... under sub

C:\Program Files\LTC\SwCADIII\lib\sub

Then you extract the symbol files into a directory you create with a suitable name under sym

C:\Program Files\LTC\SwCADIII\lib\sym

LTspice will pick up on that and they should appear on the part you place components with.

To use the bits you have to place a spice directive on you schematic, for example.

.include C:\Program Files\LTC\SwCADIII\lib\sub\CD4000.lib

If that doesn't work ask on the forum.......

Have fun

DNA

The Dragon · 16th May 2007, 09:01 PM

Thank you very much

8th May 2007, 11:44 AM	#1
The Dragon diyAudio Member Join Date: May 2007	Little Class D question Dear members of this forum I'm not studying electronics, but for some project at school they require us to make everything by us selfs. I have this little scheme that describes a simple class D my question is I can't simulate this thing because multisim does not have components like the BAT 54 diode, opamp AD8651 and the AC type shmitt-trigger (74AC14) I wanted to simulate the effects of using different IC's to determine the fastest one or an equivalent IC if they don't have the one I need in the shop. so my question finally is can someone simulate this for me or are there any programs for free that does have the required components? btw: if anyone needs the scheme, just mail me thanks in advance

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
rook question class D	mechaboy1	Class D	18	17th December 2006 01:03 PM
Another question about class A.	boxedin	Solid State	72	10th January 2006 11:58 PM
Question on PS for class AB vs class A	Duck-Twacy	Solid State	7	10th June 2004 10:44 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th May 2007, 10:35 AM	#2
fumac diyAudio Member Join Date: Oct 2006	u can use swcad III from LT is great for class-d and other switch things http://www.linear.com/designtools/so...witchercad.jsp rg fumac

10th May 2007, 08:16 AM	#3
The Dragon diyAudio Member Join Date: May 2007	it is a great program idd, but from what I have I'll need to modificate my scheme, because it does not have 74x IC's kinda sucks, I was going to make it today and hope it goes well

13th May 2007, 01:16 PM	#4
Genomerics Account Disabled Join Date: Oct 2004	There is an LTspice user group on Yahoo.... It's run by Helmut Sennewald who is a really helpful bloke. http://tech.groups.yahoo.com/group/LTspice/ You have to join Once you have then in the files section under lib..... http://tech.groups.yahoo.com/group/L.../files/%20Lib/ You get lots of nice stuff including models for 4000 series and 74 series logic. http://tech.groups.yahoo.com/group/L...al%2074HCTxxx/ I'll probably get this wrong but...... You put the .lib file into the LTspice library directory..... under sub C:\Program Files\LTC\SwCADIII\lib\sub Then you extract the symbol files into a directory you create with a suitable name under sym C:\Program Files\LTC\SwCADIII\lib\sym LTspice will pick up on that and they should appear on the part you place components with. To use the bits you have to place a spice directive on you schematic, for example. .include C:\Program Files\LTC\SwCADIII\lib\sub\CD4000.lib If that doesn't work ask on the forum....... Have fun DNA

16th May 2007, 09:01 PM	#5
The Dragon diyAudio Member Join Date: May 2007	Thank you very much

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)