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  1. kellys_eye

    Singer m4 sewing machine

    I'd suggest avoiding the RIFA make - they have a 'reputation' for self destruction.
  2. kellys_eye

    Education & Jobs in Electronics

    Too broad a spec. The skill sets vary from 'none' to PhD in the field of electronics. If you have a penchant for a particular area (construction, repair, servicing, design etc) then aim accordingly. On a very simplistic level, get the highest possible qualification there is and then 'all'...
  3. kellys_eye

    Tektronix 465 oscilloscope with garbled display

    Soldering looks ok to me. Stranded wire is no particular issue either. If you are keen to keep the OEM look then stuffing the capacitors is 'standard practise' to restorers of this type of equipment. Feel free!
  4. kellys_eye

    making two half bridges a "whole" h-bridge ir2103 and 55v bidirectional current

    The use of high(er) voltage diodes is to suppress any back EMF that itself can be of the order 100's of volts. The 4007 might be taking the issue to extremes (it's rated at 1000V) but the 4006 or 4005 would probably be ok in this application. People often spec the 4007 as the cost difference...
  5. kellys_eye

    old car stereo LCD backlight

    Assuming you're measuring across BOTH lamps (they are wired in series) you would measure B+ whatever that is - the schematic doesn't extend to revealing that figure but I suspect it might be the battery voltage i.e. 12V DC. You'd only measure 6V across ONE of the bulbs and that, only if both...
  6. kellys_eye

    DIY Kindle Remote Page Turner

    Can you read it at a distance that is further than the length of your arm?
  7. kellys_eye

    making two half bridges a "whole" h-bridge ir2103 and 55v bidirectional current

    Not sure why you were advised to use multiple half bridge devices. Use a full bridge. The 55V supply will be across the bridge supply and the transformer primary (low voltage side) across the bridge itself. The Arduino will deliver the required gate signals to switch the appropriate gates...
  8. kellys_eye

    Protection of my loads (batteries + equipment) from alternator

    None. That's for you to decide. You could use automotive (I don't know your application) or even resettable fuses (circuit breakers) or power switches (on/off) that have circuit breakers built-in. Very few alternators use external regulation these days and are devices to be avoided due to...
  9. kellys_eye

    Those that forget the past.....

    Pre the digital era all computers were of the analogue persuasion and indeed any mathematical function can be replicated using analogue functions/circuitry. In terms of component-count, analogue beats digital hands down. Digital only came into its own when the necessary speed restrictions were...
  10. kellys_eye

    Protection of my loads (batteries + equipment) from alternator

    Fuses for over-current. In fact, fuses protect your CABLING and are essential. Over-voltage shouldn't occur with the correct regulator on (or in) the alternator. If it hasn't got one you shouldn't be using the alternator for the purpose you currently are. Individual equipment should have...
  11. kellys_eye

    how to connect a digital meter between alternator and batteries

    Given the potential levels of current flow the average meter wouldn't survive (max 10A on many of them). If you have - or get - a DC reading clamp ammeter you can connect this to any cable without breaking the circuit wiring and can measure currents up to 100's of amps.
  12. kellys_eye

    Dyson V8 bypass sensors and alternative power supply

    Most hobby specific vacuum requirements rotate around air removal from casting plastics or bagging stuff for moulding (fibreglass or carbon etc) so don't come close to 'perfect' vacuums which, anyway, can't be achieved using a vacuum cleaner motor (the seals aren't anywhere tight enough)...
  13. kellys_eye

    HP Z820 with GTX 3090 24GB

    In a PC?????
  14. kellys_eye

    Identify Vintage International Rectifier Part?

    Bertus is old enough to remember them!
  15. kellys_eye

    Is this ok or will it cause problems?

    It'll work - not good practise but it'll work.
  16. kellys_eye

    Best store to buy components for PCB's?

    Mouser? RS Components? What you need is repeatability if you intend building more than one. Nothing worse than finding your supplier can't repeat an order and you need to modify the pcb layout to fit different sized bits.
  17. kellys_eye

    Google plans to scrape everything you post online to train its AI

    Have you used Google search any time recently? For anything not tech-related it delivers as biased a result as I've ever come across. On all the 'main subjects' it trots out the 'approved versions'. If AI is going to rely on scrapings from Google then expect a very heavily biased output.
  18. kellys_eye

    is it possible to build wireless tags

    It's possible to build 'anything'. Whether or not it is practical or affordable are two other questions that need to be considered.
  19. kellys_eye

    Parkside PLG 20 A1 4.5A Battery Charger fix

    My bold, your quote....
  20. kellys_eye

    Fire alarm using a PTC as a sensor.

    I'm with @dave9 on this. Smoke detection AND flame detection. Having worked in a marine environment (not a good place to be when there's fire around) you need all the warnings you can get and smoke detection is a primary device. If this is a simple case of developing an op-amp comparator...
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