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Telephone: Line Amplifier

Photo: One Watt Audio Amplifier One Watt Audio Amplifier
1 Watt Audio Amplifier. 8 Ohms impedance. 20 Hz to 20 kHz. Small, few components.
0 Comments - in Telephone
Features a telephone ring generators, phone line in-use indicators and an audio interface circuit.
PCB plans and circuit diagram (schematic) for what appears to be an extremely nice 100 watt guitar amplifier. Includes preamplifier and power amplifier circuit diagram and PCBs
Photo: Electronic Telephone Kit Electronic Telephone Kit
Learn how a telephone works. Comes complete with all parts and manual. Has the latest features such as automatic redial, mute and flashing neon lights when ringing. The clear plastic case allows you to show your friends your accomplishment.
Photo: OWI Hyper Line Tracker, Robot Kit, Educational Robot Kit OWI Hyper Line Tracker, Robot Kit, Educational Robot Kit
Similar to lail couriers used in large corporations, the Line Tracker follows a designed course. By using an infrared emitter and light-sensor circuitry, it demonstrates how robots "see" a pathway. Make a pathway with a black felt marker or blac
Photo: Phone Pickup Suction Cup Electronic Kits Phone Pickup Suction Cup Electronic Kits
No electrical connection to the telephone is required, attach a suction cup to the hand set an turn on the amplifier. This project permits group listening to phone calls. You can also use it to monitor any other oscillating electrical field. Dual IC's pro
0 Comments - in RF Amplifiers
MicroStrip 2.3 GHz (GigaHertz) RF amplifier with 1 Watt RF output power.
Describes the schematic (circuit diagram) and PCB (Printed Circuit Board) for a cheap 100-150 Watt audio amplifier with few components.
0 Comments - in Audio Amplifiers
Amplifier circuit for electret microphones (condenser microphones). Amplifier the audio signals picked up by the electret microphone, using 741 op-amp and a 2N2222 transistor.
Photo: One Watt Stereo Amplifier (2x1 Watt) Electronic Kit One Watt Stereo Amplifier (2x1 Watt) Electronic Kit
2 channel (Stereo) Audio Amplifier with 1 watt per channel.
0 Comments - in Audio Amplifiers
This simple stereo audio amplifier will amplify audio for your low-medium impedance headphones and give you left/right balance control
0 Comments - in Telephone
Electronic circuit that connects to phone line and produces and flashing LED and audible sound when there is an incoming call.
Photo: DTMF Tone Grabber Kit DTMF Tone Grabber Kit
The kit will detect DTMF tones from a telephone line or via an onboard microphone and display them on a 16 character, single line display.
Photo: High Quality 25 Watt Audio Amplifier High Quality 25 Watt Audio Amplifier
High quality 25 watt audio amplifier. Combining 2 would give a 50 watt stereo amplifier.
0 Comments - in Radio Receivers
Circuit diagram for an AM radio antenna preamplifier that amplifiers the signal before it get to the AM receiver, thus making the AM radio signals stronger for better reception.
Photo: High End Tube amplifier (180 Watt Stereo) High End Tube amplifier (180 Watt Stereo)
An extremely good stereo tube amplifier which produces 90Wrms per channel.
This audio amplifier electronic circuit uses MOSFET transistors to create more than 25 Watts output power. Uses IRF530 and IRF9530 MOSFET transistors.
Photo: 40 Watt FM Power Amplifier (1 Watt Input) 40 Watt FM Power Amplifier (1 Watt Input)
This 40 Watt FM RF Amplifier will increase the output of your FM transmitter from about 1 Watt to 40 Watts.
Photo: 20 Watt FM Power Amplifier (1 Watt Input) 20 Watt FM Power Amplifier (1 Watt Input)
This 20 Watt FM RF Amplifier will increase the output of your FM transmitter from about 1 Watt to 20 Watts.
Photo: 150 Watt FM Power Amplifier (1 Watt Input) 150 Watt FM Power Amplifier (1 Watt Input)
This 150 Watt FM RF Amplifier will increase the output of your FM transmitter from about 1 Watt to 150 Watts.
Photo: Stereo Amplifier 44 Watt electronic kit Stereo Amplifier 44 Watt electronic kit
The circuit is a gem; a TDA 1554 Integrated Circuit is used to produce an amplifier that will output up to 22 watts per channel with distortion typically not in excess of 0.1% thd. Sound quality is very, very high. Originally intended for use in an automo