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  1. kellys_eye

    RF Transmitter/Receiver Without Arduino?

    The simplest method would be to use a basic FM transmitter and receive on a portable radio. Many schematics exist for such devices - 'bugs'. But the form of transmitted signal (signal power/range/frequency) depends on the rules/regs of your country and may require licensing. Far easier to get...
  2. kellys_eye

    Switch Mode Power Supply makes a clicking noise

    It's usually safe to do so. I've only ever done so for specific thermal issues, not for detecting dud capacitors - the specific fault symptoms of which are usually enough to point in the right direction. In an ideal world we'd all have access to hi-res thermal cameras! I wish!
  3. kellys_eye

    Induction heater control --- simulation problem

    Why is 'fast' a requirement given the 'slow' response of the heating process? What do you hope to achieve by making the PLL lock/track faster? Just wondering....?
  4. kellys_eye

    Sony STR-DE305 Stereo Receiver/ Amp unit - no display nor output

    You need to be in the 'other side' of the unit before anything else. The big mains transformer has a fuse board on its input but these are likely to be ok as you wouldn't measure anything if they were blown. Measure the voltages on the multiway connectors on the power supply board and let us...
  5. kellys_eye

    RC remote frequency, change???

    The receiver looks to be LC tuned - the hole being the core of the receiver tuning coil, adjustable for 'peak response'. Change the transmit crystal (although why you want to is not known) and test for range, peaking the performance (distance) by adjusting the coil core - use the proper...
  6. kellys_eye

    protron PLTV 4050 no sound

    No. If the problem is 'just' no sound i.e. picture ok, then check the 'mute' button on the handset then any headphone sockets, the loudspeaker and then the audio output component (IC) in that order.
  7. kellys_eye

    sony walkman model WM-AF56 repair help

    Try applying switch cleaner to the relevant item.
  8. kellys_eye

    Switch Mode Power Supply makes a clicking noise

    Well done on the repair.
  9. kellys_eye

    sony walkman model WM-AF56 repair help

    Googling "WM-AF56 Schematic" brings up a couple of sites that have the technical manual as a paid download which, if you want to do your own servicing, would be an essential requirement. Armed with this and some test equipment (you'll need a multimeter as a minimum and a signal generator and/or...
  10. kellys_eye

    Dead Laptop battery charge circuit

    irrelevant. sure the charging circuit is on the mobo? Quite often it is part of the battery itself these days - it could explain why a new battery works and the old one doesn't.
  11. kellys_eye

    Sony STR-DE305 Stereo Receiver/ Amp unit - no display nor output

    Have you done a basic check of the fuses and some static DC voltage checks? Some supplies are there given the LED status but this could be from a separately developed DC supply - the main DC supplies to the amplifier stage could be fused independently.
  12. kellys_eye

    Ademco 10se Panel

    Yes, I know..... or at least I would have known had I changed the batteries in my crystal ball.....:D:p
  13. kellys_eye

    DIY wire insulation/enamelling

    Seek a local motor/transformer rewinding business and ask if they could spare a small pot of the varnish they use to dip windings into. Drawing a wire though this and locally heating it should provide sufficient insulation although I can't comment on its flexibility. Maybe 'they' could?
  14. kellys_eye

    Puzzling problem with sensor and flickering lights

    How old is the wiring? Is it up to code? Check for a junction box somewhere in the feed line. Loose fixing screws can result in excess heat at the joint which can dry out insulation and make it brittle. Check also for rodent damage.
  15. kellys_eye

    DIY wire insulation/enamelling

    Can you reveal the type of wire you want to cover and/or the intended application?
  16. kellys_eye

    Switch Mode Power Supply makes a clicking noise

    Could be something off-board that is causing the overload. Connect the board back into position but remove the DC output ribbon cable and check that the board powers up without the 'clicking'. If this is the case then you have an off-psu-board fault.
  17. kellys_eye

    DIY wire insulation/enamelling

    volts or kV? Assuming kV (as 'volts' is covered by standard enamel insulation anyway) where would you create a coil of wire where adjacent turns would exceed 500V (never mind 20-25kV)? As mentioned in more than one reply, there are practical limitations that are more easily overcome using...
  18. kellys_eye

    Vintage Hardware, should we begin replacing TANTALUMs

    On a cost-benefit basis I'm not sure this is the case. In terms of electrolytics I'd replace them only when a fault becomes apparent, not simply for the sake of it. Tantalums, in my experience, are reliable and not subject to the time constraints that ordinary electrolytics suffer from (drying...
  19. kellys_eye

    Denon S-301 Malfunction

    The full technical manual is readily available here: https://www.manualslib.com/manual/1185943/Denon-S-301.html which I suggest you download and we can discuss the rest of the procedure by reference to it.
  20. kellys_eye

    Switch Mode Power Supply makes a clicking noise

    Clicking is the sound of the over-current (or over-voltage) protection circuitry operating. Common causes are the capacitors being 'dried out' and simple replacement of the electrolytics often affects a cure. Signs to look for are leakage (fluid - maybe dried out) from the bottom of them...
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