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DTMF RECEIVER
Today, most telephone equipment use
a DTMF receiver IC. One common
DTMF receiver IC is the Motorola
MT8870 that is widely used in electronic
communications circuits. The MT8870 is
an 18-pin IC. It is used in telephones and
a variety of other applications. When a
proper output is not obtained in projects
using this IC, engineers or technicians need
to test this IC separately. A quick testing
of this IC could save a lot of time in research
labs and manufacturing industries
of communication instruments. Here’s a
small and handy tester circuit for the DTMF
IC.
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Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ... [more] |
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