If you want to check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you.
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Precision Peak voltage detector with a long memory time
We use this circuit The op-amp IC number CA3140 is the main equipment, acts as a voltage sensor that is accurate.
So It is precision peak voltage detector circuit, and it remembers voltage value in a long memory time.
In this circuit is used with a positive signal input, when has negative feedback only. And the inverting input can only get some feedback, when diode D1-1N4148 is forward biased. When we put the input signal is positive, the output voltage of op-amp increases equal to the inverting input signal.
In working, the capacitor C1 is charged to maximum voltage.
When the input is negative, the diode D1 will be reverse bias, the still voltage on the capacitor C1 but it is discharged slowly with an input current of the op-amp IC1 about 10pA.
Thus, this circuit can monitor a maximum (peak) voltage of more voltage signal and to remember them. For the following it with a multimeter.
Dual limit comparator with LM709
This voltage comparator circuit gives a positive output when the input voltage is a positive or negative more than 8.5V.
But in between that the output is negative voltage.
The positive limit point is defined by the ratio of R1, R2, and the negative point by R1, R3.
The forward voltage drop across the diodes must be allowed from it before.
The output may be inverted by reversing the inputs to the operational amplifier IC1, that LM709 is used without frequency offset.
Peak Detector by IC LF353
This is circuit Peak Detector voltage input, Use IC LF353
This be the circuit Peak Detector or checks pressure electricity topmost level is easily.Which I uses integrated number circuit LF353 be the integrated circuit op-amp perform measure electricity pressure or , compare with the pressure there. When see the circuit has already you will like. Because the equipment is a little and build easy. regard circuit idea well yes.
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