Elektronika.ba

Hi Trax
Well, everything seems to be under control. I have done the setup too. It just remains to say a big thank you to you and appologize if I took too much of your time. Wishing you all the best.
I will probably try the V2 if I get the time later.
Bluebird

I have lowered it to 6.8K and it seems to be ok. Can you give me a clear routine as how to do the setup. I am a bit confused. Thanks a lot
Bluebird

Hi Trax
Thanks for your prompt reply. I reduced the resistor to 10K and it works now. But most of the time it does not give me enough time to enter the password. It beeps after the entry of the second digit.
Any suggestions
Thanks
Bluebird

Hi Trax
At long last I have managed to hear the life giving beep. But I don't hear anything after that. After entering the password I don't hear that 2 or 3 beeps that I am supposed to hear. Can you help pls.
Cheers
Bluebird

Hi again Trax Out of desperation I checked the PIC IC on the programmer and I realized that it cannot verify the content. I reprogrammed it, it give the ok message that the programming and verification is ok. But just to be sure I tried to verify the content again but it give out the same error mess...

Hi Trax, Yes, the transformer is connected the right way. As I said in may last post, the line goes off-hook now but there is no beep!! This must be the most sought after beep for a long time :D Anyway thanks a lot for all your help. I want you to know how much I have appreciated your support. In th...

Hi Trax,
I tried the transformer taken out of the modem board anyway, still no good. I had forgotten to put back the 4148's that you earlier said to take out and for this reason was not getting the off-hook state. That is ok now but still no beep.
Waiting,
Bluebird

Hi Trax, I have removed the two 4148's but no improvement. The transformer I am using is exactly the same as the one Masoud used earlier in the V2 of this project. Nevertheless I changed it with another one of exactly the same, but this time I don't even get the line to go off-hook after the number ...

Hi agin
I forgot to ask you about the choice of oscillator option in the software when programming the PIC. Which of the 4 options do you recommend or does it not matter. I had chosen XT.
Thanks
Bluebird

I have tried a third 104 ceramic disc cap. still the same. Sound does not seem to get through.

Hi Trax I did the audio test. I could hear the dial tone from the transformer side of the .1uF polyester cap. but not after it(towards the 8870). I used an 8 ohm 0.5W speaker for the test. The dial tone was quite faint. I also used a earphone and then could hear the tone a bit louder. So I changed t...

Hello Trax Thanks a lot for your help. Using an oscilloscope I have checked the output from pin B3 of the pic at the moment of the ralay klicking, and it does send out some sort of a wave similar to a square shape for a very short time. I presume this must be the beep. Then I checked the two 4148 di...

Hello again, I wish I could take back most of what I had said in the above post. The uController had not been programmed properly. I have just progrmmed it again, the LED blinks ok and the relay latches after the first or second ring but no beeps are heard for password entry. After the phone is on h...

Hello Trax, I have been trying the phone line controller V1 by redesigning it for a single sided pcb using proteus software. Unfortunately I don't even get the LED come on. It only came on once but very slowly and only to a dim light. I have checked the crystal's output using a oscilloscope. The out...