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  1. (*steve*)

    Understanding N channel and P Channel FETs

    I'm not sure what you're referring to, but if it is my comment about what could be manufactured (including an enhancement mode jfet), they were examples of things that would be about as useful as soluble fish.
  2. (*steve*)

    Ceramic capacitors substitute

    You will note that those documents have almost no mention of leakage. The leakage characteristics of polymer caps is still an issue. In applications like power supplies it can be ignored, but definitely not in timing circuits. I'm not saying that polymer caps aren't good, they have some...
  3. (*steve*)

    Ceramic capacitors substitute

    Aluminium Polymer capacitors have high leakage compared with normal aluminium electrolytic caps and waaaaay more than ceramic. As such, I wouldn't use a polymer cap as a replacement for a ceramic in an oscillator. I'd choose a film capacitor of some type. As for bypassing, tantalum or plain...
  4. (*steve*)

    Understanding N channel and P Channel FETs

    It's fair enough to describe jfets as depletion mode. Maybe describe mosfets as "most often enhancement mode" See BSS169H6327XTSA1CT-ND
  5. (*steve*)

    Programming for beginners

    Considering that the arduino is programmed in C++, a recommendation that you learn C++ seems to be quite appropriate.
  6. (*steve*)

    Homemade PCBs with a Brother printer - 4mil Traces

    I use a carrier sheet with a hole cut in it where the image is to go and the smaller (and generally curly) piece is taped behind it. When I was doing toner transfer this worked pretty much every time. I only had failures when I put the hole in the wrong spot :-)
  7. (*steve*)

    Understanding N channel and P Channel FETs

    Yes, if you consider the Vgs(th) as a parameter that can be altered by the designer of the mosfet, roughly speaking an enhancement mode mosfet has a Vgs(th) greater than zero and a depletion mode device has one less than or equal to zero. This represents a continuum where we place enhancement...
  8. (*steve*)

    ESR meter in the battery tester

    Ok it seems you don't have a question. Perhaps you should have posted this in another section :-) However, I would advise you to double the frequency from 50kHz to 100kHz. ESR is typically specified at this frequency.
  9. (*steve*)

    Anyone know what this is?

    It looks to me that it's a very thin piece of wire, possibly designed to fail at 400mA. It looks like part of the wire is still present and there's a mark under the hole in the paper which may be the residue of the rest of the wire. My guess that for copper wire it would have a diameter about...
  10. (*steve*)

    Power Google Home Mini

    If you are using a 12V supply and a regulator of any type, the regulator should be on the end of the cable that is closest to the google home, AND you should have both input and output capacitors on the regulator. These capacitors are often (but not always) built in to the 12V car USB adapter...
  11. (*steve*)

    74LS245 it doesn't work like i think

    OK, maybe not obvious :) When the output is at logic 0, the voltage on the output is typically close to 0V. When the logic level is 1, the output voltage is close to the supply rail. But it's more complex than that. Different types of logic have a different range of voltages that are valid...
  12. (*steve*)

    74LS245 it doesn't work like i think

    That's 2 different options. It won't be 0V, and that much should be obvious. If you look at the definition, that the output becomes "high impedance", then that is closer to open, but it's not the same as open. It is easier to look a it as having undefined high resistance to a voltage level...
  13. (*steve*)

    74LS245 it doesn't work like i think

    The problem may be in your thinking. What output would you expect when the output is not enabled?
  14. (*steve*)

    ESR meter in the battery tester

    Yes, that seems to be what you did.
  15. (*steve*)

    Does anyone have history with measuring linear distances?

    Yes, I think we have.
  16. (*steve*)

    Making a variable power supply variable... (what?)

    The next interesting question is the method of driving the BLDC. In this application I have the unusual requirement that the voltage to the motor may be less than the minimum voltage to the chip logic. I can't do this with PWM (which would be my normal option) because I will be using PWM to...
  17. (*steve*)

    Is the following a universal gate?

    Ok, so if I can manufacture a NAND gate using the OP's gate, I am justified in calling that NAND gate "universal", but the one type of gate which is used to make the NAND gate is not?
  18. (*steve*)

    Is the following a universal gate?

    By that definition some NAND and NOR gates are not universal gates because their buffered outputs (which are essentially additional inverters added to the outputs) would make them a combination gate.
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