Newbie here with a simple circuit build. Trying to get an idea of how to use my scope so bear with me if this is clear and obvious.
4AA's
220o resistor
violet/blue LED
220uF cap (cap removed).
Just poking around with my oscope and can't figure out what I'm measuring here off the positive LED leg. The circuit is open; negative battery terminal is off the board and the cap is pulled. Still showing a reading on the scope and I can't explain why. Shouldn't it be showing a flat line?
From the photo, it's not possible to determine V/div and time/div. With all that antenna wire laying around, it is certainly possible to get a trace even though the voltage is likely to be quite low. Try shorting out the probe or even removing the probe from the scope. Then what happens?
I'm thinking I'm picking up my house power. It's right at 60Mhz. 200mv and 20ms/Div.
This is what I get when everything's on and the probe is grounded to the negative battery terminal.
Just poking around with my oscope and can't figure out what I'm measuring here off the positive LED leg. The circuit is open; negative battery terminal is off the board and the cap is pulled. Still showing a reading on the scope and I can't explain why. Shouldn't it be showing a flat line?
I grabbed your image and expanded it on my pc. Your display is indicating F=60.0 Hz. That's picking up line voltage noise.
It's just the normal few volts of 60Hz noise that an open circuit input, = the scope's input picks up.
Don't you find that everything slides off with the desk like that.
60 MHz
Scope inputs are very sensitive, a wire, your finger, anything that acts like an antenna will pipe a signal into it. Without any sort of tuner (filter) the power line frequency will normally dominate what you see.
M[/s]Hz
Idk man, I'm still trying to figure it out. I can replace stuff that's clearly burnt out or suck up solder that's bridging IC pins but that's about it atm.
Idk man, I'm still trying to figure it out. I can replace stuff that's clearly burnt out or suck up solder that's bridging IC pins but that's about it atm.
This stuff takes time. At least you have a first rate scope!
Put your finger on the tip of the scope probe and watch the trace go crazy at line frequency.