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  1. kellys_eye

    74166 8 bit shift registers

    https://assets.nexperia.com/documents/data-sheet/74HC_HCT166.pdf
  2. kellys_eye

    Driving a piezo buzzer: resultant tone is noisy. Why?

    Try varying the frequency - the transducer will have a natural resonant frequency that you might be missing.....
  3. kellys_eye

    PowerCon Connector's / Neutrik

    The type and suitability of plug is down to you. Providing it meets the electrical and environmental requirements I suspect there's a gazillion ways to do what you want to do. Pick one! Just make sure there's a 'difference' between types - polarisation for one - (so there's no chance of...
  4. kellys_eye

    Have seen many Youtube videos related to induction heaters but never for water?

    Not true. Where theories have been established, proven, tried and tested you can apply the results to practical examples such as the one you describe. The first and second laws of thermodynamics are paramount here - I suggest you read up on them. Your original proposition of using induction...
  5. kellys_eye

    Circular?

    Interesting - thanks for those two useful links. It does seem to illustrate that 'irregular' pcb shapes aren't part of normal board creation tools though. Both solutions in the links are all b*st*rdisations of a process rather than 'select board outline' then click-and-drag...... I suppose...
  6. kellys_eye

    Circular?

    If I had a requirement (and I do, actually) to design a small circular PCB, which software would allow me the easiest method to do so? I've not (investigated) seen such facilities - is this a case of either not being aware they can ALL do that or that it is only available on some packages?
  7. kellys_eye

    Noisy Otari MX5050 BII-2 Tape deck

    indeed it is - small audio transformer, often used for impedance matching/balanced inputs and/or small oscillator circuits. Glad to hear you found the fault - although it may not have been immediately apparent, it may have also fallen under the same fault-finding technique as 'eye's, ear's and...
  8. kellys_eye

    Quasar gx36005yq boombox

    The voltage at the primary may well be on the terminals but not at the actual winding - there is often a thermal fuse fitted (physically) within the covering of the primary winding - look for a 'bulge' in the covering and you might be able to carefully cut the tape away to reveal this fuse and...
  9. kellys_eye

    Switching PSU drops 5v.

    So did this other working PSU actually work? The confusion arises over whether the fault is on the PSU board or the board it plugs into - that statement isn't clear. Start by disconnecting the 5V output and ensure the other supplies remain as they should be. You might have to add a small...
  10. kellys_eye

    Some info I read re UV exposure resist undercutting, with questions..

    ??? - new one on me! Explain!
  11. kellys_eye

    Oscilloscopes - which is right for what?

    Short answer - depends on what you want to do with it. Long answer - depends on what you want to do with it.
  12. kellys_eye

    These transistors needed

    I always recommend one of those cheap Chinese component testers that will identify the lead-out, the gain of the transistor and some other parameters like Vbe - as well as dud ones of course!
  13. kellys_eye

    Need help with a homemade speaker system please

    answer - you MUST have an amplifier. The speakers won't be of any practical use without one. and Yes, it would be louder (than almost non-existent as would be the case without one).
  14. kellys_eye

    These transistors needed

    The 2SD467 and 2SB561 seem to be run-of-the-mill NPN/PNP transistors - what I used to refer to (elektor-style) as TUN and TUP devices. There's nothing special about them and practically ANY low power, low voltage silicon devices will do. TUN (and TUP) stand for Transistor Universal NPN (or PNP...
  15. kellys_eye

    Help!

    Mrs k_e would LOVE that!
  16. kellys_eye

    Have seen many Youtube videos related to induction heaters but never for water?

    ...so Y is NEVER going to be greater than X then....... my point exactly. You can't get more out than you put in. And 'efficiency' is a relative term - take at face value I suppose it is but taken at it's true cost I don't think so (ROI). ....making my point for me.
  17. kellys_eye

    Have seen many Youtube videos related to induction heaters but never for water?

    ahhh... but, but, but..... you'll be saving the WORLD man! /sarc off
  18. kellys_eye

    Omnidirectional Ultrasonic transmitter

    I would have thought that given the limited applications for devices such as the one you link to there isn't any other market requirement for a smaller version? You might be stuck with using a bigger one!
  19. kellys_eye

    Help!

    I need to get a life...... tell me how :D
  20. kellys_eye

    Switch replacement for lamp

    LOL - the seller uses a matchstick to indicate dimensions!!!!! The key criteria is the size of the HOLE the switch fits into. Most rocker switches will have the voltage/current handling capability (but you need to check anyway.... don't take this as gospel) but the body dimensions - NOT THE...
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