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Thank you so much. I tried to download the data but it doesn't work. I would be grateful if you could attach it to an email. My adress is sigma@netvision.net.il
Thanks again
David Popovits
Re: A/D on telephone line
I thank all memebers trying to help me. Some of the ideas are really usefull.
The measurements are needed for PABX switches. I'm improving my automatic multi port tester. For this reason I must measure actual voltage on the line. With hook on I have to check that the...
Re: separeted vdd's
A digital part of an IC is ussualy faster then the analog circuitry. The speed difference in returning to ground may cause noise affecting mostly the analog section. By separating the power pins to each part you create different paths for each part and performance will be...
battery charger power supply
In parallel with the series diode connected between the positive tag of the bat. and the output of the PSU (anode towards the bat.) connect a 20-30 Ohm 5W resistor. This will charge the bat while mains is on. This method is working fine in alarm systems. As...
A/D on telephone line
What would be the best way to isolate an A2D (like ADC0803) connected to a telephone line in order to measure DC voltage and AC voltage (while ringging) on it. With AC it is easier as a 600R can be connected between the line and the other side of the transformer may be...
If a componennt has 100ppm temp. coeficient it means that if the temperature will change with 1 degree celsius from a reference temperature then the value of the component will change with 100ppm which means with +/- 0.0001xcomponent value.
For example a resistor of 100k will become 100k +/-10...
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