Solid State Guitar Amp Forum | DIY Guitar Amplifiers

I wanted to get my hands on some negative DC and see (ok we know it will  xP ) if it would pass through a diode from the cathode side

The first "circuit" I came up with in the midst of drawing it I thought oh wait this is gonna be a normal circuit we are just looking at it from another perspective but then I realized yeah no not quite

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I kept trying to figure out how to wire this up to get negative DC and about the best I could do was having to utilize an external ground

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Which seemed to work
For the ground i connected the positive terminal of PACO to the Ground terminal of my scope
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I slowly dialed up and adjusted it to about 5C DC

So I had -5V DC at the anode side of the diode
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And then -4.4V DC at the anode

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So I think I did this right and seems to agree with what I was looking for

Then I remembered well there's nothing wrong with the first circuit it's just that the cathode will be at zero  xP so I hooked it up and get about 0.67V DC at the anode

So what's all the fuss about yeah wow the sky is blue  xP is this breaking news ?

The point being that earlier before this I only considered conventional current flow I just knew "the positive flowed" in the direction of the arrow

All of this kinda worked until I started trying to figure out alternating current and diodes  xP

What would be cool is to see some negative fluctuating DC pass through  :tu:

The next phase was a little easier

Wanting to see negative fluctuating DC travel through a diode

I connected a diode and resistor same ones in series and added a signal to the cathode of the diode

Then put my scope probe on the anode side

When I had the DC offset of the signal at zero or above no signal passed through

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(Sorry I have no idea why my phone camera only gets a fragment of the green lines)

Now if I turn the DC offset negative the signal can be seen at the anode side of the diode

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 xP