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# Maximum Minimum Voltage Indicator(1N4148)

2017-08-09 06:13
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This article describes the Maximum Minimum Voltage Indicator (1N4148). 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: 1N4148.

This circuit indicates which of three voltages in the range from about about -4V to about 4V – at A, B and C – is the highest by lighting one of three indicatorLEDs. Alternatively, it can be wired to indicate the lowest of three voltages or to indicate both the highest and lowest voltages. Op amps IC1a, IC1b & IC1c are wired as comparators, while the three indicatorLEDs and their series 1kO current limiting resistors are strung across the op amp outputs to implement the appropriate logic functions.

Circuit diagram:

#### Figure 1 Maximum Minimum Voltage Indicator Circuit Diagram

For example,LEDA will light only when pin 8 of IC1c is low (ie, A greater B) and pin 7 of IC1b is high (ie, A greater C). Similarly,LEDB will light only when pin 8 of IC1c is high (ie, B greater A) and pin 1 of IC1a is low (ie, B greater C).LEDC works in similar fashion if the voltage at C is the highest. Note that if all theLEDs and their parallel 1N4148 diodes are reversed, the circuit will indicate the lowest of the three input voltages. And if each 1N4148 diode is replaced by aLED, the circuit will indicate both the highest and lowest inputs.