dialerf chip NTE1691

[mister_e]

Maybe why DTMFOUT exist in PBP


LR40992 seems to be one of the original equivalent
http://www.datasheetcatalog.com/data.../LR40992.shtml

Not something i would use myself.

[lerameur]

thanks, thats the datasheet, I needed. I will try using only a microcontroller at first. I just thought is might be safer to use a dialer chip. both for isolation and... I guess thats it
I found earlier this very simple circuit:
http://ourworld.compuserve.com/homep...n/autocall.htm

[mister_e]

KingGeorge and MasterVox should have a sh!t load of those telephone line transformer in stock... under their usual 10-15 feet of dust

Not sure if i would use the schematic AS-IS for PBP. Worth a try.

Use 20MHz for better results in PBP.

[lerameur]

master Vox is the only that has dialers..
they also have those two cheaper dialers at 2$ T25089 MK50981N.
but there are no pictures and I have not seen any datasheet.
can you find any?
Google got me only 162 results without datasheet.
I learned that NTE chips are replacement chips wow!

[mister_e]

and in the good ol' day it was ECG

In montreal area you can also find NTE at Raybel Electronique and really few at Active Électronique.

MK50981 = ECG1693 = NTE1693 = LR40891

T25089 = S25089 = KS5808 = LR4089 = MK5089 = SBA5089 = T25089 = UM95089 = NTE1690
LR4089 http://www.datasheetarchive.com/pdf/2033097.pdf

To me NTE is more a last resort replacement part rather than a part... one reason why their documentation are a bit small....