HT9200 - Electronic Circuits Projects Diagrams Free

mimo · 22nd March 2004, 09:29 AM

HI.

I was trying to interface the DTMF generator (HT9200) to tel line.
I was able to hear the tones, but it's not dialing them!?!?!?!

Any idea? Any circuit ??

I'm using an isolation transformer !!

10x in advance !!

falleafd · 22nd March 2004, 02:46 PM

http://www.holtek.com.tw/docum/comm/9200.htm

This page may help you.

goodluck

falleafd · 22nd March 2004, 02:58 PM

http://www.dvanhorn.org/Downloads/HT9200.ASM

This is the source code for your application

and the homepage of David VanHorn is

http://www.dvanhorn.org

Goodluck.

mimo · 23rd March 2004, 09:45 PM

10x guys.....

But the problem is not in the code...

I'm able to hear the DTMF tones though the telephone line, but the problem is that HT9200 is not really dialing them.

I think the problem is in the interface circuit between the chip and the line, and Holtek does not provide any help regarding this subject.....

any idea ???

falleafd · 24th March 2004, 08:00 AM

I don't know what you did with your circuit, but David tell so clearly that

Quote:

Implements everything from talking directly to the chip, through a DTMF_OUT buffer that is handled by interrupts in a multitasking system. (This functionality depends on some basic buffer management functions that are not included in this package See 'Getting Started')
The dialer implements an algorithm to speed up the DTMF dialing by reducing the silent time between dis-similar digits.
This may be useful to Picsters too, since the basic logic is all you need.

You may visit his page and ask him for more because he did it well.

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22nd March 2004, 09:29 AM	(permalink)
mimo	HT9200 HI. I was trying to interface the DTMF generator (HT9200) to tel line. I was able to hear the tones, but it's not dialing them!?!?!?! Any idea? Any circuit ?? I'm using an isolation transformer !! 10x in advance !!

22nd March 2004, 02:46 PM	(permalink)
falleafd	http://www.holtek.com.tw/docum/comm/9200.htm This page may help you. goodluck __________________ Falleaf mail@falleaf.net English forums at PIC Vietnam - Vietnamese Electronics forums R&P Trading and Forwarding Co. Ltd. Distributor of Microchip in Vietnam

22nd March 2004, 02:58 PM	(permalink)
falleafd	http://www.dvanhorn.org/Downloads/HT9200.ASM This is the source code for your application and the homepage of David VanHorn is http://www.dvanhorn.org Goodluck. __________________ Falleaf mail@falleaf.net English forums at PIC Vietnam - Vietnamese Electronics forums R&P Trading and Forwarding Co. Ltd. Distributor of Microchip in Vietnam

23rd March 2004, 09:45 PM	(permalink)
mimo	10x guys..... But the problem is not in the code... I'm able to hear the DTMF tones though the telephone line, but the problem is that HT9200 is not really dialing them. I think the problem is in the interface circuit between the chip and the line, and Holtek does not provide any help regarding this subject..... any idea ???