Knight Rider with Halogen Bulb

[audioguru2]

Transistors should always have a resistor or circuit between their base and emitter to turn them off. Without anything, then heat or a nearby radio transmission will turn them on or keep them on.

 

[MP1]

There are many applications where a resistor between base and emitter is not needed on a transistor.
"Always" is certainly an exaggeration.
Also note, protection from radio waves requires filtering. A resistor does not protect against radio interference.

MP

 

[audioguru2]

There are many applications where a resistor between base and emitter is not needed on a transistor.

Darlington transistors also have a resistor between base and emitter.View attachment 39526

 

[MP1]

Darlington transistors also have a resistor between base and emitter.

Not always. They are used both ways...which is another example of situations that do not require this resistor.

MP

 

[Captain Nguyen]

Schematic works  ;D 8)

 

[wuemura]

Schematic works  ;D 8)

Nice, i will make the same effect but for a break light for my car with very bright led's, but i will change some things to look like a normal break light (all led's on) and than after some time knight rider effect, you see here at Brazil we can't use any light effects outside the car, like flashes etc. Only Police, fire fighters, ambulance can use such a things.

 

[Captain Nguyen]

I have already break lights up (all-on) then knight rider effect.

My Power Supply are to weak to get break light up.
So, you see this effect when I try get break light up then knight rider effect.

http://www.captain-nguyen.nl/knightrider/videos/NewScanner20Watt.wmv

 

[ante1]

What do the cops have to say about it? ;D

 

[Captain Nguyen]

Nothing  ;D

I did not use when I drive.

 

[ante1]

They might be envious and give you a fine!  ;D

 

[Captain Nguyen]

LOL.........  ;D