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  1. WHONOES

    Harman Kardon 495i

    My remarks in post #6 apply to the poor bass. When a capacitor dries out, it's effective value reduces which would cause the problem you are experiencing.
  2. WHONOES

    In need of some Career Guidance!

    I worked in the UK defence industry years ago and got to play with some big toys.
  3. WHONOES

    I have created a Mathematical Construct that will change the way we do maths !

    You should ask for a raise but that could take a long time!
  4. WHONOES

    I have created a Mathematical Construct that will change the way we do maths !

    Spose the thought process required for the answer to that will be infinite!
  5. WHONOES

    Delay Relay

    Just remembered good old time delay relays. See attached link. Simple to implement and adjust. https://uk.rs-online.com/web/c/automation-control-gear/timers-counters/time-delay-relays/
  6. WHONOES

    Delay Relay

    Not at all unreliable. Spose you have nothing better to do than stick lots of emojis on your replies.
  7. WHONOES

    Delay Relay

    So can an analogue solution with no code to develop and just a few components.
  8. WHONOES

    Delay Relay

    A microcontroller is definitely overkill.
  9. WHONOES

    Hitachi 57F710E rear projection no longer turns on after power failure

    Yeah, could easily be a dry joint.
  10. WHONOES

    Delay Relay

    I you can't find anything on the market that is ready made, a very simple device can be made that does not need a PIC or a processor of any kind. The 4538 precision monostable will work and needs just 2 timing components and is triggerable with either a positive or negative pulse and provide...
  11. WHONOES

    Hitachi 57F710E rear projection no longer turns on after power failure

    Thinking about it a bit more, it sounds like it is something to do with moving the unit. It could be something like a crack in a pcb in the switch area that opens and closes when you move the TV or something like that.
  12. WHONOES

    Hitachi 57F710E rear projection no longer turns on after power failure

    Has the socket you normally plug the TV into failed?
  13. WHONOES

    Harman Kardon 495i

    Have to agree with Audioguru. Sounds like the output capacitor has dried out during storage. Simply replacing it may cure your problem. If you can, replace it with a bipolar electrolytic of the same value and voltage. This advice assumes of course that the amplifier does not have a split rail...
  14. WHONOES

    Hello, can somebody help wich transistor is like bfg520

    Hi, I'm back after a few days in the lake district. Why do you want to connect multiple inductances? Thanks. Yes the Simetrix simulator is very good, been using it for years.
  15. WHONOES

    Hello, can somebody help wich transistor is like bfg520

    Tuning range seems OK. My simulation work with the BB515. Have you built a physical circuit?
  16. WHONOES

    PWM - Potentiometer ohm importance...

    Currently using it for my hand held 12V mini drill which is often to fast for some of the jobs I do. It runs at about 250Hz if I remember correctly.
  17. WHONOES

    Continuity Tester for Codger...

    If you just want to register continuity below a certain value it should be fairly straight forward using a battery, a cheap comparator and a bright LED.
  18. WHONOES

    AC Square Wave 10A Power Supply

    Looks OK now. As I said previously, build it up and set to work a section at a time. As I found very early on in my electronics life, building a circuit in one hit is fraught with problems. If it fails t work, where do you start? whereas when doing it a section at a time, if the next bit added...
  19. WHONOES

    ViewSonic monitor button sending signal when not pressed

    Sometimes a squirt of cleaner is enough to get them working again.
  20. WHONOES

    Power Cap.

    Are you sure it is legal to mess around with such stuff on your system. It's not in the UK.
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