Advertisement
Spy Telephone circuit Schematic – Circuit Schematic
Spy Telephone circuit Schematic
...
Cell phone jammer circuit – Circuit Schematic
Cell phone jammer circuit
...
AFSK 1200 Modem Based on PIC16C620 – Circuit Schematic
AFSK 1200 Modem Based on PIC16C620
...
Television Circuits – Circuit Schematic
Television Circuits
...
receiver circuits – Circuit Schematic
receiver circuits
Simple CATV Upstream Fiber Optic Receiver Uses DC Pilot AGC. Upstream fiber links in a community antenna television (CATV) system are usually among the most dif...
Cellular Phone Calling Detector Circuit – Circuit Schematic
Cellular Phone Calling Detector Circuit
This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashin...
Telephone line monitor circuit – Circuit Schematic
Telephone line monitor circuit
This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`s microphone input, ...
IMPROVED TV COLOR WHEEL CONVERTER – Circuit Schematic
IMPROVED TV COLOR WHEEL CONVERTER
d 101-2 depend on the TV to supply a wide bandwidth video signal. Most black-and-white TVs from 1954 on contain narrowband IF strips or low-pass filters. A wide...
ATV Repeater System Exciter – Circuit Schematic
ATV Repeater System Exciter
A model RTX-70 exciter that was originally used in the Brookdale ATV Repeater System. This page describes some the design considerations and new features possib...
Telemetering Beacon For VUSAT – Circuit Schematic
Telemetering Beacon For VUSAT
The beacon controller is intended to be operated for telemetering data available on board of the VUSAT in Morse code so that the ham radio operator can decode t...
Internal modem schematics – Circuit Schematic
Internal modem schematics
This diagram shows how an internal SoftV92 Data Fax Modem interacts with phone line. The modem is from Zoltrix but a Conexant utility says it is a "Churchill Da...
Equipment in use – Circuit Schematic
Equipment in use
The Comtech has become the de facto standard now for those entering the Amateur TV scene. Sadly the production may be coming to an end with the lower demand for...
DTMF Controller circuit – Circuit Schematic
DTMF Controller circuit
...
Telephone Ring Generator Using Small Power Transformer – Circuit Schematic
Telephone Ring Generator Using Small Power Transformer
The interval between rings can be lengthened or shortened by varying the value of the 1 Meg resistor. The 70 volt/ 30 Hz ring voltage is produced from the 120 v...
9-Line Telephone Sharer – Circuit Schematic
9-Line Telephone Sharer
This circuit is able to handle nine independent telephones (using a single telephone line pair) located at nine different locations, say, up to a distance of 10...
2 line intercom plus a telephone changeover switch – Circuit Schematic
2 line intercom plus a telephone changeover switch
Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for connecting the othe...
VoIP on iPod – Circuit Schematic
VoIP on iPod
The line-in pin is clearly visible in the pinout of iPod connector shown on the iPod wiki. From then they came a long way through making their first hand solder...
Telephone line surge protection circuits – Circuit Schematic
Telephone line surge protection circuits
...
Telephone recording – Circuit Schematic
Telephone recording
...
ADSL filters explained – Circuit Schematic
ADSL filters explained
...