This is a design for simple measurement that can be use for show the peak audio response on an analogue meter, similar to the tape recorder meters. This circuit is work with based on CA3140 op-amp as a non inverting amplifier, but with one addition a diode in the feedback loop. This is the figure of the circuit.
The circuit has a fast response time and slow decay time to indicate peak readings. The 1N4148 diode provides half wave rectification of the input signal, output dc smoothed by the 22u capacitor. The capacitor will charge the peak value of the input waveform, and then the liquid through the meter and the 18k resistor. I use the meter with FSD of 150uA, but each meter with FSD in the range of 50-250uA can be used. Disposal of time is about a quarter of a second. Increasing the cap to 22uF discharges a longer time.
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