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Long Interval RC Timer Using Op-Amp (LF155)

2017-02-05 07:41  
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This article describes the Long Interval RC Timer Using Op-Amp (LF155). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: LF155.

With the help of high gain high impedance operational amplifier, we can build a long time delay with resistor-capacitor (RC) circuit since it allow high resistance resistors to be used. We can calculate the time (t) using the following formula; Time (t) = R4.C.ln(Vr/(Vr-Vi)). For design example is a 100 second timer, where this circuit uses this following components: Vr=10V, C=1uF, R3=R4=144M, R6=20K, R5=2k, R1=R2=1k.

LONG INTERVAL RC TIMER circuit schematic diagram


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