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Author Topic: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL  (Read 5441 times)

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Offline Whacko

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CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« 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
Nothing's impossible

Offline Whacko

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #1 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
Nothing's impossible

Offline Whacko

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #2 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!
Nothing's impossible

Offline Chaoticone

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #3 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
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Whacko

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #4 on: October 19, 2007, 09:16:53 AM »
Here goes! Thanks Brett.

Whacko

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Offline Whacko

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #5 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
Nothing's impossible

Offline Chaoticone

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #6 on: January 16, 2008, 11:49:24 PM »
Hey Whacko, where you been? Only one more post to reach 200 for ya.

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Whacko

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #7 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

Nothing's impossible

Offline Chaoticone

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Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #8 on: January 22, 2008, 11:43:29 AM »
I know what you mean, always something to do.

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: CAPACITIVE DECOUPLING OF tHE 20KHZ SIGNAL
« Reply #9 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