Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent

Filter 18.432M

The detector can respond to alarms in the supply voltage fluctuations of the circuit under test. This unobservable fluctuation is often not allowed for some systems, it can create logic errors or cause significant damage.
As shown in the figure, the circuit is mainly composed of a 5G7556 dual timer, the left half of which constitutes the power supply falling wave detection circuit, and the right half constitutes the power supply rising wave detecting circuit. The working power is taken directly from the circuit under test, which is also the object of monitoring.
When the power supply voltage fluctuates, the reset threshold voltage of the 7556 also falls. When the threshold is lower than the voltage saved on C1, F1 is reset to a low level, and LED1 emits an indication.
When the power supply voltage rises and falls, the trigger set voltage of the 7556 also rises. When the trigger voltage rises above the saved voltage value on C2, F2 is set to output high level, and LED2 illuminates to indicate an alarm. Once LED1 and LED2 are illuminated, they can only be extinguished by pressing switches AN1 and AN2.