Hi, I'm new to circuits and electronics stuff, so kindly help me to solve the issue.
I'm trying to add led DRL to my car, everything is working well if I power my circuit with 9V battery, but if I connect it to car battery after 3-5 seconds it getting blown. I have no idea why it's happening, I have attached schematic for reference.
Hopefully you have pins 1 and 8 connected up.
Normally there is a capacitor across the supply. (0.1uF and maybe a large cap to)
The absolute maximum voltage on the LM555 is 16.
A car voltage is 12 (more or less) when stopped.
BUT
When operating the voltage is 14.5 volts. (could be as low as 12 or as high as 18)
My guess is that the supply voltage is too high.
Hopefully you have pins 1 and 8 connected up.
Normally there is a capacitor across the supply. (0.1uF and maybe a large cap to)
The absolute maximum voltage on the LM555 is 16.
A car voltage is 12 (more or less) when stopped.
BUT
When operating the voltage is 14.5 volts. (could be as low as 12 or as high as 18)
My guess is that the supply voltage is too high.
Ignition was off while testing out and I tested voltage of battery it was showing around 12.45. Doubt that leds draw more current despite having transistor.
And it would be better if your "LED's and Resistors part of the Circuit" was connected between the Battery and Collector.
Not from the Emitter to Battery Negative.
And it would be better if your "LED's and Resistors part of the Circuit" was connected between the Battery and Collector.
Not from the Emitter to Battery Negative.
I'm using 13005A, and after connecting leds in collector part, I can see the increase in power slightly. Technically emitter should produce more power with collective of base and collector but why it's other way round?
I'm using 13005A, and after connecting leds in collector part, I can see the increase in power slightly. Technically emitter should produce more power with collective of base and collector but why it's other way round?
I see no problem with using an NPN emitter follower in this application.
The LEDs already need a resistor to control the current, so if the lower voltage from the emitter follower is a problem, you just need to reduce the resistor values to compensate.
1) Don't use a MOSFET as a emitter follower (source follower) like in the schematic.
2) Transistors can have very low C-E voltage drop. It is common for the C-E voltage to be less than 0.6V. Maybe you are thinking about B-E voltage.
3) MOSFETs have high resistance Gate to Drain or Gate to Source. Maybe you are thinking about the resistance of D-S.