VU Audio Level Meters

Schematic for an electronic audio level VU meter that uses LED's to display the volume/audio levels.

This temperature meter uses a Harris 7106 IC as the heart of a low cost, accurate temperature meter. LCD 3-1/2 digit readout. All of the active circuits are in this one, versatile chip. In addition to temperature functions, the board includes an area for

This LCD panel meter is a very flexible design that can be customized to your own VOLT meter or AMP meter needs. It may be customized to measure any voltage range, standard or not. Or you can customize it to measure input from a transducer; full details a

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

This is a very eye appealing audio accessory. Displays an approximate output level for each channel of a stereo amplifier. Connects to the speaker terminal; levels are displayed in ten steps. User may select either a moving dot bar appearance. Uses two LM

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

This audio amplifier electronic circuit uses MOSFET transistors to create more than 25 Watts output power. Uses IRF530 and IRF9530 MOSFET transistors.

Using ultrasonic techniques, this solid-state design has no moving parts.

This kit uses the TDA2009 class AB audio amplifier IC for high quality stereo applications.

Shows an electronic circuit diagram (schematic) for a simple 10 Watt audio amplifier, using only 4 transistors.

Describes the schematic (circuit diagram) and PCB (Printed Circuit Board) for a cheap 100-150 Watt audio amplifier with few components.

Variable gain audio amplifier capable of powering a small speaker for personal use

Features a telephone ring generators, phone line in-use indicators and an audio interface circuit.

18 Watt Mono Audio Amplifier. Possible to use two for Stereo sound.

This LCD panel meter is a very flexible design that can be customized to your own VOLT meter or AMP meter needs. It may be customized to measure any voltage range, standard or not. Or you can customize it to measure input from a transducer; full details a

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

A Mono audio amplifier which produces a very good 7 watts output power.

2 watts of power across to channels is what this kit delivers. Great quality.

Introduces the Optocoupler-triac MOC3010. Complete electrical isolation between input audio signal (low voltage circuit) and output light modulation. Operates from 100 VAC line. Audio input via 3.5mm jack.

Learn the basics of mechanical and electronic circuits. Lesson includes magnetic recording, audio amplifier theory, motor speed control,mechanical switches, and much more.

A very low cost and simple electronic circuit to generate square, pseudo-sinewave and triangular waveforms in the Audio frequency range. Uses a quad opamp LM348. Good educational kit.