Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Whacko on October 16, 2007, 06:45:13 PM

Title: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Whacko on October 16, 2007, 06:45:13 PM

Hello all you happy campers! Some people have asked for a circuit, but I cannot upload, the server is blocking me.
I sent the circuit to ART's email, and hopefully he will post it.
I have also noticed that spammers are finding their way in here, so that might be why I can't post pictures.

Regards,
Whacko

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Whacko on October 16, 2007, 11:59:09 PM

Art has added the circuit schematic to the ftp site. The link to view the file is: ftp://machsupport.com/ExtraInformation/20KHZ_WATCHDOG.JPG
This circuit can tolerate a wide range of frequency and can be modified for 5KHZ by changing the Capacitor values from 10 nf to 20 or more nf. I designed it and use it all the time with good results. The circuit will lockout on about one or two pulses. The signal will go low regardless of the port pin state.
 
Regards,
Whacko

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Whacko on October 19, 2007, 05:43:05 AM

The circuit I sent to Art is erronous, I have sent the corrected schematic to to post on the ftp server. My apologies, to all.
I'm not too sure when Art will post it but the filename will have "revised" appended to it.

Whacko for apologies!

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Chaoticone on October 19, 2007, 05:46:53 AM

Thanks Whacko,
     You should be able to post pictures. Let me know if you try it now and it doesn't work.

Brett

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Whacko on October 19, 2007, 09:16:53 AM

Here goes! Thanks Brett.

Whacko

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Whacko on November 06, 2007, 01:21:02 PM

Just a note, this is a 20khz circuit but works well down to 5KHZ. Although the schematic looks like a big circuit, it actually has a small footprint. If anyone wants the artwork for this, gimme a shout I'l post it

Whacko

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Chaoticone on January 16, 2008, 11:49:24 PM

Hey Whacko, where you been? Only one more post to reach 200 for ya.

Brett

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Whacko on January 22, 2008, 12:54:26 AM

Hi Brett,

Walked straight into a mad rush 2008. Hope you folks had a fab christmas. I'm glad it's over in a way, I got tired of family and parties, till end of year yet arrives again.
I will be more regular on the site soon. We have some big orders, and projects, good for business. I'm also tied up in firmware development, so It's late night hours programming.

Whacko

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Chaoticone on January 22, 2008, 11:43:29 AM

I know what you mean, always something to do.

Brett

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: dhookings on January 25, 2008, 05:45:00 AM

Can I request the artwork you mention please?

Looks good to me. A better wheel than I could re-invent.


Dave

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Chaoticone on January 25, 2008, 06:17:04 AM

It is in reply # 4 in this topic.

Brett

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: dhookings on January 25, 2008, 06:35:17 AM

I can't find the artwork there, only the schematic.

Am I doing something wrong?

Dave

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: Whacko on February 16, 2008, 03:35:19 PM

Dave, apologies for the absence, I included the Gerber cam files and pdf's of the artwork. I didn't see the thread.

Whacko

Title: Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
Post by: dhookings on February 18, 2008, 05:35:28 AM

No sweat. I'm rather occupied on other things at the moment, but I'll get that etched as soon as possible. At the moment I just leave the pc on all the time :-)

I notice you use the same layout programme as me. Do you adapt the drill file to drill on the mill?

Thanks again.

Dave