Panel switch wiring

While detecting discontinuities on a schema board, it is probable to include resistors, semiconductors or other elements in measurements. This situation may cause wrong results. On the other hand sometimes the voltage or current of the multimeter may defect some schema components.

Our schema overcomes this inconvenient conditions. The schema determines greater than 1 ohm values as discontinuity. Measure voltage is not more than 2mV. So no kind of diode, IC or other component is bypassed. Maximum current output of the schema is about 200uA.

Indicator of the schema is a LED. Voltage supply may be two 9 Volt batteries. Voltage adjustment of the amplifier is done by P1 potentiometer. To do this process, first short schema the probes and then turn P1 until LED brights. When you separate the probes again LED will fade out. This is a cheap and very useful schema. You can build it on a PCB to use more easily.