Description SPDT Songle relay 10A 250VAC or 30VDC, middle pin to one side ON, on side OFF, when active coil it switches verse vice. On Board NE555 IC delays the switch after power up, delay time 0 ~ 25 s. Delay time = T＝1.1RC. For example, capacitor 47uf and trim pot potentiometer 500K T=1.1*500000*0.000047=25.85 seconds. (Max. ) On board fixed capacitor 47UF on right side. Tune trim potentiometer can tune delay time. Operational voltage 5V for logic and relay. Relay keep switched after triggered until power off. On board two press button, top button to manual set to re-count the delay time, bottom button to manual set off the relay status. On board power diode to avoid wrong power connection. On board optical coupler, isolate relay signal. Documentation please see on this page.
