vinodquilon
Member
That is a good idea.
But I use NE555, there is no specification about bypass capacitors in its data sheet.
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That is a good idea.
Philips assumes that you know that an ordinary 555 needs supply bypass capacitors. Did you look at the datasheet for the LM555 that is exactly the same IC?But I use NE555, there is no specification about bypass capacitors in its data sheet.
Philips assumes that you know that an ordinary 555 needs supply bypass capacitors. Did you look at the datasheet for the LM555 that is exactly the same IC?
Intersil mentions the 400mA supply current spike caused by an ordinary 555. Without proper supply bypassing then logic ICs that use the same power supply fail to work properly.
Sir,
Between two telephone lines how we can identify which line to be grounded and which one goes to DTMF IC.
You can test the telphone wire by using LEDs. LEDs will light up since they require little current. By the way, i am also doing the project. Can you please show me your progress and i hope yo ucan send me a clear schematic diagram?