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ethernet Poor eye diagram where to start looking – Circuit Schematic
ethernet Poor eye diagram where to start looking
This is the eye diagram for the transmit pair. The receive pair is very similar. It`s a LAN8700 PHY, and I`ve got the MII interface effectively disabled, so the...
TIPE Project – Circuit Schematic
TIPE Project
A simple non-commercial grade multiplexer compatbile with telephones. It will supports 4 telephone lines, and will multiplex over one cable. The topic was free ...
Two way Simple Very Small Telephone Exchange – Circuit Schematic
Two way Simple Very Small Telephone Exchange
This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off ho...
Phone Spy Transmitter – Circuit Schematic
Phone Spy Transmitter
Here is a very simple telephone broadcaster transmitter which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless t...
Phone FM Transmitter – Circuit Schematic
Phone FM Transmitter
This Phone FM transmitter connects in series to your telephone line and transmits the telephone conversation over the FM band when you pick up the telephone han...
DTMF Receiver IC MT8870 Tester – Circuit Schematic
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 communications circ...
Flyback Power Supply Powers Subscriber Line Interface Circuit – Circuit Schematic
Flyback Power Supply Powers Subscriber Line Interface Circuit
Cable and xDSL modems are experiencing increasing popularity. For this reason, many designs are now required to interface with existing telephones at the subscr...
QPSK Demodulator Is A Good Match For Low-Cost Modulator – Circuit Schematic
QPSK Demodulator Is A Good Match For Low-Cost Modulator
This demodulator is suitable for the quadrature phase-shift keying (QPSK) modulator previously published by the same author, "Novel Low-Cost QPSK Modulator Need...
RFI-Free Ringer Generator Works Off Single 5-V Supply – Circuit Schematic
RFI-Free Ringer Generator Works Off Single 5-V Supply
A simple yet effective circuit to generate a POTS-compatible ringing voltage can be made from National Semiconductor`s LM4871 audio-amplifier IC and a dozen pas...
cellular phone detector circuit schematic – Circuit Schematic
cellular phone detector circuit schematic
Using this electronic schematic, can be designed a very simple cellular phone detector circuit which can sense the presence of an activated mobile cell phone fr...
Flexible AC Transmission Systems – Circuit Schematic
Flexible AC Transmission Systems
The acronym FACTS stands for “flexible ac transmission systems.”These systems add some of the virtues of DC, i.e., phase independence and fast....
Adopt the dialing demoder conceptual design of embedded DTMF of MSP430 – Circuit Schematic
Adopt the dialing demoder conceptual design of embedded DTMF of MSP430
DTMF dual tone multifrequency The signal is a commonly used signalling in the telephone network, no matter on home telephones, cellular telephones or SPC exchan...
Side tone coupling circuit diagram – Circuit Schematic
Side tone coupling circuit diagram
Side tone coupling:In telephones, it is the hearing of one`s voice in the receiver when one speaks. Too muchside tonemake people speak lower and can cause feedb...
Telephony Circuits and DTMF Circuits – Circuit Schematic
Telephony Circuits and DTMF Circuits
9-line telephone sharer This circuit is able to handle nine independent telephones (using a single telephone line pair) located at nine different locations, pdf...
Nokia 6111 Schematic Diagram – Circuit Schematic
Nokia 6111 Schematic Diagram
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Samsung SGH Z320i Schematic Diagram – Circuit Schematic
Samsung SGH Z320i Schematic Diagram
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Skema Sony Ericsson K510 – Circuit Schematic
Skema Sony Ericsson K510
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Samsung SGH E715 Schematic Diagram – Circuit Schematic
Samsung SGH E715 Schematic Diagram
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Samsung SGH E 860v Schematic Diagram – Circuit Schematic
Samsung SGH E 860v Schematic Diagram
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Telephone Audio Interface Schematic – Circuit Schematic
Telephone Audio Interface Schematic
Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed i...