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  1. WHONOES

    What's the working principle of this inverter circuit ?

    Duke37 is correct in his analysis.
  2. WHONOES

    Capacitor test on a tube amplifier

    The crackling could be from a potentiometer cheap old carbon types are notorious for it especially if they have been used a lot or have a lot of current passing through them. If the leakage you are referring to is round the capacitor on the right hand side of your picture, it is hot melt glue...
  3. WHONOES

    What's the working principle of this inverter circuit ?

    Apart from what BobK says, it is not the best of circuits as there will most likely be some conflict between the two halves of the circuit where they will both be on at the same time for a short period. A single ended circuit would be a better bet. I would also run it at a much higher frequency...
  4. WHONOES

    Design bass amplifier

    For the headphone amplifier you could use one that I put on the forum for someone else and he seemed very happy with it. It is quite simple and fairly easy to build. I have attached the schematic. For the speakers, I will have a look at what may be achievable for 100 Euros. Does that sum include...
  5. WHONOES

    Design bass amplifier

    Regarding the speakers. It depends on whether you are prepared to build a box and how much you are prepared to spend. Why do you need to buffer the headphone output? Is it not adequate? Or for some other purpose?
  6. WHONOES

    Changing AC plug to battery operated

    Yes there are. But they have a limited range if you want to transmit directly to a ground base.
  7. WHONOES

    Touchscreen Digital Multimeter Product.

    Don't see any point.
  8. WHONOES

    Sensor circuit

    Easy enough using a comparator or even a single transistor + some other bits.
  9. WHONOES

    Breadboard to Perfboard

    Vero Board / Strip board is much easier to use as it vastly reduces the amount of wire links that you have to use. As Bluejets said, you just cut the tracks.
  10. WHONOES

    Home circuit fault feeding back into speakers?

    Your speaker problem sounds like a blown output stage on your amplifier. What you are actually hearing is the power supply hum caused by the speaker being directly coupled to the power supply. You need to investigate your amp.
  11. WHONOES

    Switching a transistor with "body voltage"

    Your body makes an excellent broadband R.F. (radio Frequency) antenna. You are probably injecting R.F into your circuit via capacitive coupling from you body.
  12. WHONOES

    Home circuit fault feeding back into speakers?

    Have you tried you speakers i someone else's flat / house to see if the problem is replicated. Doing so would eliminate or confirm as problematic.
  13. WHONOES

    Two stage preamp designing

    What are you trying to achieve? Have you tried simulating it? It would be a good idea to draw your circuit a bit more conventionally with the + power rail at the top as this makes it a lot easier to read as well as not having to include all those 12V cells on your sketch.
  14. WHONOES

    Design bass amplifier

    Perhaps we should encourage him to use something else!
  15. WHONOES

    Design bass amplifier

    I agree with you, the spec on those units is not very good but, they are not the only 6.5" drivers on the planet. There are numerous units that will easily outperform them.
  16. WHONOES

    Design bass amplifier

    Yes, but I can get nice tight bass out of a 6" unit. As I said it is just a case of picking the correct unit and loading it correctly. Have been doing it for a long time.
  17. WHONOES

    AC 18650 Replacement?

    As for a power supply, try googling a 3.6V wall wart. There is a number of them out there.
  18. WHONOES

    AC 18650 Replacement?

    See datasheet link for more info,. http://www.cree.com/led-components/media/documents/XLampXML2.pdf
  19. WHONOES

    Design bass amplifier

    I disagree, 6" speakers can be used for Sub Woofers. The units I used in my Hi-Fi are 6.5" diameter. The -3dB response is 33Hz and produce enough bass to rattle the windows. It is just a case of choosing the correct, or should I say, appropriate speaker chassis and loading it correctly. As for...
  20. WHONOES

    Resistivity question help

    No, I think it refers to the actual resistance of the said 1 Metre cube.
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