Telephone: Line Amplifier

1 Watt Audio Amplifier. 8 Ohms impedance. 20 Hz to 20 kHz. Small, few components.

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

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.

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

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

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.

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.

2 channel (Stereo) Audio Amplifier with 1 watt per channel.

This simple stereo audio amplifier will amplify audio for your low-medium impedance headphones and give you left/right balance control

Electronic circuit that connects to phone line and produces and flashing LED and audible sound when there is an incoming call.

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.

High quality 25 watt audio amplifier. Combining 2 would give a 50 watt stereo amplifier.

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.

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.

This 40 Watt FM RF Amplifier will increase the output of your FM transmitter from about 1 Watt to 40 Watts.

This 20 Watt FM RF Amplifier will increase the output of your FM transmitter from about 1 Watt to 20 Watts.

This 150 Watt FM RF Amplifier will increase the output of your FM transmitter from about 1 Watt to 150 Watts.

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