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transverter unit – Circuit Schematic
transverter unit
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samsung sgh i900 – Circuit Schematic
samsung sgh i900
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Z3816A Modification – Circuit Schematic
Z3816A Modification
The Z3816A is a GPS disiplined timing source that was manufactured by HP in the middle 90`s. It was intended for use in cellular telephone equipment. It provide...
Telephone Switcher – Circuit Schematic
Telephone Switcher
This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control up to 4...
An Improved PL Tone Encoder – Circuit Schematic
An Improved PL Tone Encoder
IMPROVED PL TONE ENCODER BY A significant amount of interesthas been generated since my last article on a PL tone board.Because of this interest I decided to im...
Phones Circuit – Circuit Schematic
Phones Circuit
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SEISMIC RADIO 500mHz - 200Hz frequency range – Circuit Schematic
SEISMIC RADIO 500mHz - 200Hz frequency range
The most popular is MED-NET, which covers all the mediterranean sea with its observation points. The shown map shows the observation points in the mediterranean...
transceiver circuits – Circuit Schematic
transceiver circuits
The unit is based on a PHILIPS FM880 link transceiver which was originally supplied to a Telecom Australia specification for telephone applications in remote ar...
Type C Carrier Telephone Systems – Circuit Schematic
Type C Carrier Telephone Systems
The type C system was first installed about 1925 and has been very extensively used. It incorporates the most desirable features of the systems just considered....
Homemade Phone PBX – Circuit Schematic
Homemade Phone PBX
Voicemail capacility (although not implemented, there are four ADCs that can be used to sample and record the phone audio) A storage volume (SD card) would need...
3 KILOBAUD FULL DUPLEX FSK MODEM – Circuit Schematic
3 KILOBAUD FULL DUPLEX FSK MODEM
Values shown are for 13-kHz bandwidth 1070 Hz for mark and 1270 Hz for space, using Exar XR-2206 function generator and XR-2211 FSK de-modulator Report gives ...
PLL SINGLE TONE DECODER – Circuit Schematic
PLL SINGLE TONE DECODER
Can be used for Touch-Tone decoding as well as for telephone-line and wireless control applications using single audio frequency. Operating center frequency dep...
REMOTE TELEPHONE BELL RINGER – Circuit Schematic
REMOTE TELEPHONE BELL RINGER
The telephone-line extension bell ringer shown will enable you to add a remote ringer in your garage or some other area where a ringing telephone cannot be hear...
PROM CW IDENTIFIER – Circuit Schematic
PROM CW IDENTIFIER
Call letters stored in 8223 PR0M U3 drive 74151 multiplexer/data selector U4 for keying NE555 audio oscillator U5 which feeds transmitter mike input through RA....
TYPICAL NE567 TONE DECODER CIRCUIT – Circuit Schematic
TYPICAL NE567 TONE DECODER CIRCUIT
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TV STATION CONTROL – Circuit Schematic
TV STATION CONTROL
Control pulses transmitted in blanking interval by tv network transmitter are decoded by receiver circuits shown and translated into six different switching act...
Single chip TV chroma luma processor – Circuit Schematic
Single chip TV chroma luma processor
The CA3217E contains all required circuit functions between the video detector and picture-tube RGB driver stages of a color television receiver. The CA3217E de...
CONTROL TONE DECODER – Circuit Schematic
CONTROL TONE DECODER
Permits monitoring local VHF FM repeater for calls from friends without having to listen to chatter of others or to repeater noise. Operation is similar to that...
Color TV chroma processor with ACC color killer and an injection lock reference system – Circuit Schematic
Color TV chroma processor with ACC color killer and an injection lock reference system
Color TV chroma processor with ACC, color killer, and an injection lock reference system. fypical power supply voltage is 9 to 11. 5 volts. Hue control range is...
Color TV subcarrier generator – Circuit Schematic
Color TV subcarrier generator
Color TV subcarrier generator. The crystal shown is for 3. 58 MHz. The ECG1131 noted on the schematic is a chroma signal amplifier. The ECG1132 is a 16-pin DIP ...