10 Stück 5-30V Micro USB Power Delay Relais Timer Steuerung Trigger Verzögerungsschalter
13,16 €
For example: 22uf capacitor and resistor 1M, then T = 1.1 0.000022 1000000 = 24.2 seconds. Many manufacturers add the optocoupler isolation, but there is no separation between module's ground and signal's ground, would not achieve the interference effect.
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