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I'm not doubting you at all. I was just pointing out it is possible to have a higher test voltage than battery voltage. I've built a couple of pedals with 18vdc available from a 9vdc input using charge pumps. Old battery powered tube radios (such as those used in cars) used voltage...

It could have a charge pump or series of voltage doublers.

This is the best spec sheet I found with a quick look. I'm guessing 4.5vdc for transistors up to 30v for zeners but could be wrong.

Do you have a voltage meter? You should be able to check the voltage while testing a transistor.

I'm interested in this too. I've built a few Dumble style tube amps. While studying them I found out he often would tune an amp to a specific type of pickup, i.e. single coil or humbucker, and often the amp would not sound very good with the other type. I wonder if this might hold true with...

That should be fine with a HEPA filter. Most important is that it draws the fumes away from you. It looks like yours discharges out of the filter and draws in at the top. Most I have seen would draw in through the filter, but I'm sure you can situate it in a manner that keeps you from...

Edge Mount Standoff Edit: added pic

What I'm seeing, and this is a question as much as statement because I'm a bit rusty at this, is Rcb (R2) without R1 (Rb) will pull the Base high turning the transistor to FULL ON because it does not have a DC isolating capacitor that would make it a pure feedback circuit. Rb (R1) forms a...

Low Tide schematic and Low Tide Mini build documents.

No it doesn't. The input filter helps clean up noisy a noisy input power supply. Keeping current off ground is more of a safety measure at higher voltages, not a huge concern with our pedals but very important with anything using wall voltages such as a guitar amp. It can also help in...

In my day job I work on Industrial Instrumentation. The sensors, or Transmitters as we call them, are +24vdc powered and in the wiring connecting them to the main control system black is +positive. The other color, typically white, is -negative. This can vary from facility to facility but in...

The first three, red, black and green, are commonly used in general electronics as you list. I like that you distinguish between ground and negative, ground should never carry current.

What do you plan to make that you will use the power supply for? Just pedals? I just got a 30volt 10amp supply off Amazon that works well for me for about $40. Ohm's Law and Watts' Law are a good place to start for theory, Google is your friend :)

It's not that polarized are necessary it's more of a case of what's available. The amps I've built required 220uf to 330uf with 350volt ratings and polarized electrolytic are all I found in that value/voltage rating. In response to the OP IMHO there is no reason one couldn't replace one type of...

Something like this is what i had in mind: Rotary Encoder

On your automatic pot tester, what about using a digital encoder to determine shaft angle? An encoder puts out pulses as it rotates. Stepper motors with feedback use these for the feedback. Using one by itself may be easier to program (I'm not a programmer, just going on the theory of less...

Many of the labels on these are actually heat shrink. I agree with what @Nostradoomus just posted.

For tube amp pwr supplies an LC filter typically is used, have you tried an inductor in conjunction with a cap? For 60hz ripple 3-4mH coil with ~100uF cap before coil and 20-30uF after. Or perhaps a ferrite bead for the HF noise in the last two pics posted?

Try putting a filter cap on to see the effect. 10u to 100u should be good. Electrolytic between v+ and ground.

Oh sure, bring up reading comprehension again. Minor technicality 🫲🧐🫱