A hydraulic circuit diagram showing

  
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FIG circuit, the oil pressure sensor is converted into a variable resistor Rt. Due to changes in Rt, changing the size of each transistor is biased, three LEDs (red, yellow, gr
A hydraulic circuit diagram showing - schematic

een) under forward bias in a different light. Therefore, as long as the bias resistor is appropriately selected, it can ensure that only one light emitting diode, to indicate the corresponding hydraulic pressure.




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