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FRENCH COLOR TV CHROMINANCE – Circuit Schematic
FRENCH COLOR TV CHROMINANCE
SECAM system uses time multiplexing of two chrominance signals, transmitted sequentially, with one-line memory in receiver circuit. -R. Chaste, P. Cassagne, and...
Thunderhead Technologies – Circuit Schematic
Thunderhead Technologies
WxVoice is an automated voice-back system that uses your PC`s voice modem to speak the current and past weather conditions over the telephone. WxVoice takes adv...
Telephone Ringer – Circuit Schematic
Telephone Ringer
This circuit generates the sound of the electronic ringer found in modern telephones, supplanting the 2-bell electromechanical ringers used previously. The ring...
Televideo – Circuit Schematic
Televideo
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The Telegraph Time Machine – Circuit Schematic
The Telegraph Time Machine
The great network of telegraph wires that once enfolded the nation like a cobweb has vanished just as surely as the spider`s handiwork is erased by a sudden swe...
Telephone Circuits – Circuit Schematic
Telephone Circuits
When a new computer modem enters the household, the demands on the home phone line skyrockets. The Internet surfer can use phone time on a par with the most tal...
Telephony DTMF Circuits – Circuit Schematic
Telephony DTMF Circuits
This circuit is able to handle nine independent telephones (using a single telephone line pair) located at nine different locations, PDF Bidirectional telephone...
Wireless Telephone – Circuit Schematic
Wireless Telephone
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The English Ringing Converter Technical Description – Circuit Schematic
The English Ringing Converter Technical Description
This device can`t be legally hooked up to the PSTN as there is all sorts of red tape you need to go through to get the device registered for that. The basic fun...
SMS Power – Circuit Schematic
SMS Power
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telephone ring generator circuit – Circuit Schematic
telephone ring generator circuit
This is a switch selectable dual output "re-hashed" version of my previous (2007) design, and uses a field programmed EPROM for generating both versions of the ...
ring generator circuit – Circuit Schematic
ring generator circuit
Restore the older style of telephones which used a pair of gongs to annunciate an incoming call, AND long to hear the nostalgic peel of those bells Presented he...
DTMF decoder using MT8870DE – Circuit Schematic
DTMF decoder using MT8870DE
This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone. The dial tone we heard when we pick up the phon...
Small TV Modulator Using A Motorola MC1374 – Circuit Schematic
Small TV Modulator Using A Motorola MC1374
How can television modulator be small and simple like this? First, it uses integrated circuit, and the second, any TV modulator is nothing more than amplitude.....
XR2211 Linear FM Detector – Circuit Schematic
XR2211 Linear FM Detector
This is a linear FM detector circuit. This circuit usually is used in telemetry applications and wide range of analog communications. The main part of this.....
Wireless Telephone Line Spy – Circuit Schematic
Wireless Telephone Line Spy
This is a phone bug circuit. This wireless telephone line spy circuit can be used to transmit the phone conversation to a nearby FM radio. This circuit must.....
RS-485 Signal Loss Detection – Circuit Schematic
RS-485 Signal Loss Detection
The safety shutdown and fault isolation protocol are critical in many telecommunication, industrial, data processing system and industrial. To share data.....
RS-485 Signal Loss Detection – Circuit Schematic
RS-485 Signal Loss Detection
The safety shutdown and fault isolation protocol are critical in many telecommunication, industrial, data processing system and industrial. To share data.....
GS1674 Adaptive Cable Equalizer – Circuit Schematic
GS1674 Adaptive Cable Equalizer
The GS1674 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75ohm coaxial cable. The device is optimized for per...
GS1674 Adaptive Cable Equalizer – Circuit Schematic
GS1674 Adaptive Cable Equalizer
The GS1674 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75ohm coaxial cable. The device is optimized for per...