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  1. (*steve*)

    Is the following a universal gate?

    That sounds like opinion.
  2. (*steve*)

    Ceramic capacitors substitute

    OK. it's nothing really critical. Use an aluminium electrolytic or a tantalum.
  3. (*steve*)

    ESR meter in the battery tester

    It does have a significant harmonic content so your measurement may be affected a little by it. Having said that, I don't know if ESR meters typically use a more pure sine wave.
  4. (*steve*)

    Programmable Load

    Wikipedia has a page on programmable loads. For me it comes up as the first result after the paid advertising.
  5. (*steve*)

    I can't find any website will tell me what my transformer goes to or is good for

    A photo might be useful. Is it like this?
  6. (*steve*)

    Programmable Load

    Have you tried googling? If you don't understand what you find, post a link here mentioning what it is that you don't understand and we can try to explain it to you.
  7. (*steve*)

    Yenka and PCB Creation

  8. (*steve*)

    Is the following a universal gate?

    An interesting universal gate is the two input mux. It can't implement nand or nor on its own, but it can implement xor, or, and, and not, so with 2 of them you can implement nand and nor. Incidentally, it implements xor faster than using conventional logic gates. And it can implement the...
  9. (*steve*)

    Hardware debouncing

    If you design your code as a state machine (and assuming that your code fits that model) then you should be able to do it without interrupts, simply scanning the keyboard at every transition. Edit: the important thing in your circuit is not the inverter but the Schmitt trigger input. If your...
  10. (*steve*)

    How to charge li-ion batteries

    Back to your original question... The cells you have can easily explode or catch fire if overcharged. They can also be damaged if they are discharged too far. The battery pack you took the cells from would have had a controller in it to prevent either of these things from happening. If you...
  11. (*steve*)

    ESR meter in the battery tester

    Perhaps you can post the circuit for the benefit of others. One thing I didn't comment on earlier is the somewhat imperfect triangular waveform in post #3 in this thread that you describe as a sine wave.
  12. (*steve*)

    Ceramic capacitors substitute

    I can't tell because I don't know anything about the oscollator other than its frequency. Perhaps you could post the circuit and give the parameters under which it should operate. Things like frequency tolerance, temperature range, supply voltage range etc. If you're using the voltage across...
  13. (*steve*)

    ESP8266 (esp-07) powered by battary(s) for at least 1 year

    I don't think you meant what you said, but If you mean what I think then you're right.
  14. (*steve*)

    Ceramic capacitors substitute

    It all depends on how much stability you require. At that frequency leakage isn't likely to be a significant issue. Have you watched that video yet? It's almost half an hour long, so I don't think you have.
  15. (*steve*)

    Ceramic capacitors substitute

    Oh, the are ceramic capacitors that have flexible mountings designed for use in applications where there might be large temperature changes, unleaded solder, and/or board flexing. Incidentally, lead free solder is apparently more rigid than tin/lead solder, making breakages of ceramic...
  16. (*steve*)

    Ceramic capacitors substitute

    The datasheet for the T55P475M010C0200 mentions that it's suitable for supply bypassing and does not have any information about leakage or temperature stability of its capacitance. I wouldn't recommend it for critical timing purposes. The ECHU1C104GX5 on the other hand has a datasheet that is...
  17. (*steve*)

    Ceramic capacitors substitute

    My initial feeling is that I would go the other way, but I'll look them up later.
  18. (*steve*)

    ESP8266 (esp-07) powered by battary(s) for at least 1 year

    You may be able to completely remove power from the ESP module when it's not needed. The attiny could switch a MOSFET to turn it on.
  19. (*steve*)

    Hello, Welcome! (Introduce yourself)

    Hi Senaka. Welcome to Electronics Point.
  20. (*steve*)

    ESR meter in the battery tester

    Fine, the original circuit you referred to use 50kHz. Presumably your meter has fixed leads and hence the zero can be set one and forgotten. I usually use a set of dedicated probes for mine, but sometimes I change to another set (mine can use regular multimeter probes) and hence the lead...
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