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  1. kellys_eye

    Smd resistor unbelievable

    All the SM resistors are shown with small 'boxes' drawn around them - R83 isn't one of them....
  2. kellys_eye

    How To Interface 12v 10w Solar Panel To 12v 1.3ah Battery

    You need a charge controller, a blocking diode (potentially) and a regulator. http://www.ebay.co.uk/itm/Multi-function-20A-Solar-Panel-Charge-Controller-12V-24V-Intelligent-Regulator-/202043879140?hash=item2f0ac0eee4:g:n2oAAOSwk6ZZqm1A...
  3. kellys_eye

    Induction Heater Diy, How To Improve Performance?

    The best induction heaters are designed for specific purposes/materials as they all rely on resonance to deliver the efficiencies they require. The signal you use to drive the coil is critical to the system and must equal the resonant frequency of the circuit. The coil is part of a tuned...
  4. kellys_eye

    HC-05 and annoying pulsation

    Further power supply capacitive decoupling would probably help but you'd need to get it close to the power pins of the device driving the LED and/or the LED itself. This would likely necessitate the use of additional surface-mount devices and if you're reluctant/incapable of removing the LED...
  5. kellys_eye

    Nostalgia

    They soon got wise to that and started filling them with opaque 'gel' (silicon grease?).
  6. kellys_eye

    HC-05 and annoying pulsation

    Remove the LED
  7. kellys_eye

    Need Some Help With This Vfd

    Ready-made 7-segment LED voltage/current displays (in a multitude of different LED colours) can be found at most Chinese suppliers (eBay, Banggood, Aliexpress etc) for as little as $2. They are as accurate as most people would ever require and too cheap to pass over..... Feed them a supply...
  8. kellys_eye

    Nostalgia

    Windows being, imho, solely responsible for the creation and encouragement of bloatware - a personal peeve of mine.
  9. kellys_eye

    Nostalgia

    oh, so do mine. I built a PC (the ETI Triton) in 1979(?) and have been 'intimate' with every iteration of PC's since - with a 'diversion' to μcontrollers (MC68705P3S) and many other devices. ISTR starting out with MSDOS 2 with spatterings of DR DOS in there too. I resisted Windows as long as...
  10. kellys_eye

    Help needed with led connector insulation

    Water seepage from where? If the strip is mounted out of the direct path of splashes or running water there shouldn't be an issue but if you have any concerns then adhesive-lined heat shrink sleeving would make an effective seal although I'd personally use a directly soldered connection with...
  11. kellys_eye

    Type of adhesive to use to hold stud on PCB

    'Came off'....?? How? Sheared? Metal, plastic? Two-part epoxy (JB Weld, Araldite etc) is the usual adhesive - unless there is a hole to re-tap, larger stand-off to fit etc.
  12. kellys_eye

    Panasonic RF-7100 8 track

    Potential problem with the motor/belts/heads and we get a few pictures of....... not them.....???? Motor, capstan, belt or simply the tapes themselves. Do you have a 'new' recorded tape to play? Or are your tapes all old pre-recorded versions? Sounds like tape degradation to me.
  13. kellys_eye

    Need Some Help With This Vfd

    Depends on the main controller/driver device. If it is a simple 'segment driver' chip then it is perfectly possible. If the device is pre-programmed to drive the display as a clock (which seems quite likely given the central colon (seconds) character) then you won't be able to do it. Probably...
  14. kellys_eye

    Nostalgia

    Just watched the latest EEVBlog on Youtube where Dave enthuses over the pre-Arduino Single Board Computer that is the PC/104. I could relate to everything he said - pre-empting all his knowledge - just from the fact that I dug one out of my own scrap box a few months ago and spent a...
  15. kellys_eye

    LPG Sensor ckt help

    Did you not get the datasheet for the board?
  16. kellys_eye

    Timer to trigger linear actuator

    You need limit switches to detect extension/retraction. Thereafter a simple digital programmable timer will do everything.
  17. kellys_eye

    Mosfet driver ir2112 circuit high side is not working

    ...yes, we probably can.
  18. kellys_eye

    Generac generator output

    You're missing @Minder comment - that modern appliances with digital timers/displays don't USE the mains frequency to derive their timing......
  19. kellys_eye

    Audio desk

    It looks for all the world like a simple audio player without the amplifier.... the USB interface being used as the audio input device (for the audio in/out and headphone/microphone sockets) and - potentially - an MP3 playback facility. There's nothing left worth re-using as far as...
  20. kellys_eye

    Battery life calculation.

    Many other variables to consider too - have you checked the battery chemistries and/or consulted the manufacturers data sheets for the proposed battery? Your calculations are based on 100% efficiency, perfect ambient temperature, no self discharge, an 'ideal' battery etc etc. (Rounded up to...
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