I have a simple circuit 110VAC through a step down transformer to 37 volts; That has 10,000uF capacitor across it so the unloaded output voltage shows on my scope as 52 volts; The green line.
I have a 2SA1302 transistor that has it's emitter connected to the positive voltage rail, the collector connected to a 4.7K Ohm resistor then a blue led then ground.
The base of the transistor has a 220 Ohm resistor.
As you can see from the images below just the basic setup and yellow waveform has a 900mV ripple.
As I place my finger on the base resistor; the LED starts to light up but the ripple only gets worse.
The third image has 10V pk-pk ripple. Why is that when all i'm powering is a simple LED?
I have a 2SA1302 transistor that has it's emitter connected to the positive voltage rail, the collector connected to a 4.7K Ohm resistor then a blue led then ground.
The base of the transistor has a 220 Ohm resistor.
As you can see from the images below just the basic setup and yellow waveform has a 900mV ripple.
As I place my finger on the base resistor; the LED starts to light up but the ripple only gets worse.
The third image has 10V pk-pk ripple. Why is that when all i'm powering is a simple LED?