While detecting discontinuities on a circuit
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 circuit components.
Our circuit overcomes this inconvenient conditions. The circuit 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 circuit is about 200uA.
Our circuit overcomes this inconvenient conditions. The circuit 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 circuit is about 200uA.
Simple Wire Continuity Tester by LM709
Indicator of the circuit 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 circuit 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 circuit. You can build it
on a PCB to use more easily.
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