1 Stück 5-30V Micro USB Power Delay Relais Timer Steuermodul Trigger Verzögerungsschalter
1,96 €
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.
Jetzt bei Ebay: