EXTENDED RANGE VU METER BAR MODE circuit

This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only...

LED Volt Meter Circuit LM324

This circuit is a practical device that, when installed in a vehicle, displays the voltage of the car battery using an LED dot display. The meter circuit utilizes four comparators formed from a quad op-amp, specifically the LM324. The inverting...

ARRL Handbook Audio Intelligibility Enhancer

Assistance is sought for building the N4GG audio intelligibility enhancer project as detailed in the ARRL Handbook. A circuit board has been ordered from Far Circuits, but there are difficulties in sourcing the necessary components. Attempts have been made to...

LED display control circuit diagram of a counter

The decimal seven-segment storage decoding drive unit 74HC143 provides a constant output for all segments, each at a voltage of 5V and a current ranging from approximately 15mA to 22mA. The BCD data for the seven-segment decoder can be accessed...

VU and PPM Meter Circuit for Audio

A VU (Volume Unit) meter has traditionally been a key component of audio metering systems. The Peak Program Meter (PPM) is known for its inadequacy in accurately displaying peak signal levels. This circuit serves the same function as previously described....

Audio Beat Detect ?« Electronic Product Design

This circuit employs a digital potentiometer to enable the microcontroller to automatically adjust the circuit's gain according to the ambient audio volume. However, a standard potentiometer can be used if automatic adjustment is unnecessary. The low-pass filter design is based...

Audio Level Meter (VU Meter)

This circuit utilizes a single integrated circuit (IC) along with a minimal number of external components to display audio levels through ten LEDs. The input voltage range is from 12V to 20V, with a recommendation for 12V. The LM3915 is...

vu meter 1

This circuit functions as a simple optical level indicator for sound signals, adaptable to various user needs. It allows for adjustments to input levels via trimmer potentiometers TR1 (Level) and TR2 (Gain). The signal is then rectified by diodes D1...

Simple vu meter schematic

Expensive stereo systems generally feature VU meters that help indicate maximum power levels to prevent overloading. However, typical radio tape players do not include VU meters. A potential solution involves using a multimeter as a replacement. This can be achieved...