Hi, is it possible to light a LED even in reverse polarity? Like passing through a circuit. Im applying on automotive. Thanks
Yes, you can connect it at the center of a diode bridge.is it possible to light a LED even in reverse polarity?
Because of the way the diodes are connected there's no easy way to get all the LEDs to light at the same time.Is there a way to make the Led stays lit up and not flashing?
He already has a 555 circuit.You probably want something like this 555 circuit
As long as we dont use the flashing mode in major roads its okayIsn't there standards and certifications for this type of use?
As long as we dont use the flashing mode in major roads its okayIsn't there standards and certifications for this type of use?
ThanksIf you want full DC on the LEDs for maximum brightness, here's a way to do it with a 4PDT switch or relay.
You have to break the LED connections in the circuit and connect them to the contacts as shown:
The four switch/relay contacts are shown in the normal flashing mode.
When the contacts are moved to the upper position, the LEDs are disconnected from the 555s, and Vcc and ground are applied in the forward direction across all LEDs (D1 and D2 each represent the 4 LEDs in the actual circuit).
I assume the LEDs have some resistance in series to limit their current and allow them to operate from 12V(?).
If not that would need to be added.
View attachment 241215
As long as we dont use the flashing mode in major roads its okayIsn't there standards and certifications for this type of use?
ThanksIf you want full DC on the LEDs for maximum brightness, here's a way to do it with a 4PDT switch or relay.
You have to break the LED connections in the circuit and connect them to the contacts as shown:
The four switch/relay contacts are shown in the normal flashing mode.
When the contacts are moved to the upper position, the LEDs are disconnected from the 555s, and Vcc and ground are applied in the forward direction across all LEDs (D1 and D2 each represent the 4 LEDs in the actual circuit).
I assume the LEDs have some resistance in series to limit their current and allow them to operate from 12V(?).
If not that would need to be added.
View attachment 241215
Poor visibility because of fogs but when on major roads mostly the condition is clear upI must be missing something, Why are you installing a flasher if you want the LEDs to stay lit?
Bob
ThanksYou probably want something like this 555 circuit - I've drawn up a skeleton circuit, but you'll have to work out the values.
You can also use an op amp - I've attached a skeleton circuit for that
Not recommended. That would put the flash rate into, or very close to, the range which can trigger epileptic seizures in certain susceptible people.perhaps just speeding the flash rate to 10Hz would work.
There are a lot of different flash rates that could be used, and while I have heardthat claim before I wonder about it's validity. AND, is that really a problem in this application?Not recommended. That would put the flash rate into, or very close to, the range which can trigger epileptic seizures in certain susceptible people.