This circuit provides secrecy when two or more telephones are connected in parallel to a telephone line. The circuit also prevents incomin...
Pulse Generator
This circuit is very useful while checking/operating counters, stepping relays, etc. It avoids the procedure of setting a switch for the...
Friday, February 6, 2009
Test and Measuring
DTMF Receiver IC MT8870 Tester
Today, most telephone equipment use a DTMF receiver IC. One common DTMF receiver IC is the Motorola MT8870 that is widely used in electronic...
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