So here is a question
I was fooling around with trying to get an LED to blink at a specific frequency
A trigger from my frequency source is connected to the gate of an N chanel logic level get well within the VGS voltage. Basically i have a square wave oscillator on the gate
I put my scope on the drain and i can tell that my mosfet is switching like it should be and at the right hz
However if i put the scope probe on the other side of the LED i get garbage. How is this possible?
So the first scope image is from the drain.
The second is from the other side of the LED
I was trying to figure out why my LED was not blinking at the 38Khz i have it triggered. The messed up scope image is obviously to blame but I'm not exactly sure why. A BS170 N chan should be more then happy switching at 38khz
Any ideas?
Ive included a basic schematic to help get the point across
''
Please excuse the cap and resistor in this picture. Its part of the trigger.
Nothing to do with the LED circuit
Scope image from the gate and the same at the drain. Showing my switching is working correctly
Now a shot of my signal on the other side of the LED
Obviously not switching correctly
Anyone know why?
I was fooling around with trying to get an LED to blink at a specific frequency
A trigger from my frequency source is connected to the gate of an N chanel logic level get well within the VGS voltage. Basically i have a square wave oscillator on the gate
I put my scope on the drain and i can tell that my mosfet is switching like it should be and at the right hz
However if i put the scope probe on the other side of the LED i get garbage. How is this possible?
So the first scope image is from the drain.
The second is from the other side of the LED
I was trying to figure out why my LED was not blinking at the 38Khz i have it triggered. The messed up scope image is obviously to blame but I'm not exactly sure why. A BS170 N chan should be more then happy switching at 38khz
Any ideas?
Ive included a basic schematic to help get the point across
Please excuse the cap and resistor in this picture. Its part of the trigger.
Nothing to do with the LED circuit
Scope image from the gate and the same at the drain. Showing my switching is working correctly
Now a shot of my signal on the other side of the LED
Obviously not switching correctly
Anyone know why?