The sound decibel meter circuit shown underneath reacts to audio air pressure concentrations from approximately 60 to 70 dB. The sound is sensed by an eight ohm loudspeaker, intensified by a transistor stage together with a LM324 op-amp stage. The other three segments of the LM324 quad op-amp are being used as voltage comparators in […]

# Meter Circuits

## Simple Accurate Capacitance Meter Circuit

In this simple yet accurate analogue capacitance meter circuit, the significance of a capacitor depends upon giving it exactly the same charge as a reference capacitance followed by evaluating the voltages between these. This utilizes the method C = O/V where C is given as the capacitance in Farads, O would be the charge […]

## Simple Digital Voltmeter Circuit

The article points out a straightforward digital panel type voltmeter circuit utilizing a single IC L7107 and a couple of other normal parts. The circuit has the capacity to calculate voltages right up to 2000 AC/DC V. Providing this easy digital panel voltmeter circuit is especially hassle-free on account of the access of the A/D […]

## How to Build a 1.5 V Inductance Meter Circuit

Right here a easiest yet quite precise inductance meter is introduced, which is often developed within couple of minutes. Moreover, the circuit may be powered-up with a single 1.5V cell. In spite of this, a frequency meter could well be needed to work-out the inductance. The circuit is fairly self-explanatory in which, two NPN transistors […]

## How to Build a ESR Meter Circuit

The submit addresses a basic ESR meter circuit that are available for recognizing bad capacitors in an electronic circuit without getting rid of them practically from the circuit board. ESR which means Equivalent Series Resistance is a negligibly small resistance value that typically turns into an element of all capacitors and inductors and can be […]

## Accurate Analogue Frequency Meter Circuit

To measure frequency one does not immediately have to ‘go digital’. The analogue approach will invariably prove simpler and cheaper, in particular when the analogue readout (the multimeter) is already to hand. All that is needed is n a plug-in device, a ‘trans1ator’, that will give the meter an input it can ‘under stand’. This […]