And I live in Hong Kong, where along with the temperatures of Thailand, we get the humid season.
Two months of rain.
Well, i'll go with the circuit Eric posted. Many thanks. Can someone please give me a shot by shot explanation of how it works? I'm still on basic RC circuits.
hi,
Ref the image I posted previously.
When the ignition is OFF the circuit is not powered.
At ignition ON, the C1 cap charges via R6 and R1, R6 is a variable so that you can tweak the delay time.
As the voltage on C1 reaches the switch on voltage at the Gate of the 2N7002, [the delayed period] current flows thru the diode of the opto coupler, R2 and thru the 2N7002.
The current thru the opto diode makes it emit light [IR],, this is detected by the opto transistor and current flows thru the opto transistor, R3 and into the Gate of the SCR.
The SCR switches ON and stays ON, the current thru the SCR also flows thru the headlights.
When you turn OFF the ignition, the SCR switches OFF.
The diode D1 and C2 cap provide simple filtering, the diode also reduces the effect of the battery voltage falling as the starter motor is used.
Is this enough.?