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  1. kellys_eye

    Timer circuit

    Easiest way for the non-electronics-inclined is to purchase a timer relay that has all the functionality you require and only needs you to connect the output contacts to the solenoid used to control the flow. Companies such as RS Components (there are others) offer many such devices and you can...
  2. kellys_eye

    Design a short circuit protection for +15/-15 and +10/-10 DC power rails

    Diodes in series with the outputs will prevent 'backfeeding' although you might have to compensate for their volt-drop by adjusting the regulator outputs (i.e adjusting the regulator feedback resistors or putting another diode in the ground lead of the fixed DC regulators). If the devices don't...
  3. kellys_eye

    Identify component L2

    What are the fault symptoms? Be specific and tell us as much as you can.
  4. kellys_eye

    Identify 1960's Diode Manufacturer By Logo?

    Is this a matter of curiosity or a 'need for replacement'?
  5. kellys_eye

    Identify component L2

    I understand what you came across and why your thoughts went in that direction but it also illustrates the old adage - "if it ain't broke, don't fix it"....:)
  6. kellys_eye

    MF/HF marine radio

    Could be a 'comms' issue 'tween tx and ATU. Many manufaturers use a multi-core as well as the RF coaxial feed. The multi-core can be a full comms path (send/receive) or a simpler relay selection signal with VSWR 'error feedback'. This is why we need to know make/manufacture as there can be...
  7. kellys_eye

    Identify component L2

    It's not really an inductor - it's a ferrite suppressor, just a piece of wire passing through the core of a piece of ferrite. OK, that's 'really' an inductor but the value will be smaaaaallllllll. Either way it reads short-circuit normally and your circuit will likely work even if you remove...
  8. kellys_eye

    Generac Smart Management Module Dead

    Oooo....shame you caused such damage in removing it - more so since the readings you give indicate it may well be ok. The 'short' you measured previously is likely to have been due to the switching inductor as part of the remaining circuitry. Such are the tribulations of trying to repair this...
  9. kellys_eye

    electronic Tesla valve (ETV)

    This is a conclusion I came to a LONG time ago and tried to convince 'higher powers' that trolling was his only purpose. Well it would appear that either by his own hand or that of the 'higher powers' he hasn't shown his face here for a while - and I'm not pleased to admit that I'm glad to see...
  10. kellys_eye

    Can you please tell me how am i supposed to replace these fuses ? They are mounted on the pcb surface and i don't have a hot air station.

    Hey there, Speedy Gonzales!
  11. kellys_eye

    Can you please tell me how am i supposed to replace these fuses ? They are mounted on the pcb surface and i don't have a hot air station.

    A conventional soldering iron would achieve the same result - I'd use clippers to remove the major parts of the fuse itself to give better access to the copper pads for soldering. Can't say I agree with the cheapskate fuse installation method... Have you checked for the reason why the...
  12. kellys_eye

    Check individual cells of a car battery.

    :D Built-in fire extinguisher too! Could be doubly-useful ( a Tandoor!) for curry consumption/dumping.... PS - hit the 'smiley face' in the post 'toolbar' to see a small selection of smilies that you can insert in posts.......
  13. kellys_eye

    High Voltage Direct Current

    I think (hope?) you say that in jest? I always understood the US Constitution to define 'money' in terms of silver and gold i.e. No state shall coin money, emit bills of credit, or make any thing but gold and silver coin a tender in payment of debts. ~ Art. I, sec. 10, cl. 1. Of course this...
  14. kellys_eye

    Generac Smart Management Module Dead

    The middle pin (connected internally to the larger 'tab' heatsink) is invariably the Drain. The Gate is most often 'driven' so will be connected via a resistor in the 100's or 1,000's ohms range (usually the lower value) or directly from another driving device - it is also a very low current...
  15. kellys_eye

    Generac Smart Management Module Dead

    We need to know which leads are 1, 2 and 3 to be sure but the 'zero' measurements across the two/three sounds totally wrong. Remove that part and retest to make sure there are no other components in-circuit causing false readings.
  16. kellys_eye

    Check individual cells of a car battery.

    It's more about the after effects. Atomic-proof pants and hold-down straps when you're sat on the khazi. Not really! We're more famous for the flavour than the heat. As it should be.
  17. kellys_eye

    Check individual cells of a car battery.

    Safety squints.... I recall seeing large rubber gloves and a leather apron but in a dim memory so maybe that was even before then i.e at college when I was in training. Either way, H&S was a much different world then to now. Today I reckon I'd have to complete a risk assessment form and...
  18. kellys_eye

    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

    Using and Arduino, components and software.....?. the cheapest/simplest method is a mechanical (clockwork or just a powered microwave platten motor - suitably geared) mechanism turning a platform that is angled for the latitude. Are you using an LED as the light sensor or an LDR?
  19. kellys_eye

    Heat causing automotive LCD display to dim. Can't find a solution.

    Since it's not the SRAM but 'heat' that's causing the issue then you need to insulate the A7 device from where the heat is coming from. This might be possible using just a 'blob' of thermal grease on top of the device - this would dissipate the heat evenly over the area of the thermal compound...
  20. kellys_eye

    Check individual cells of a car battery.

    During my days in the Merchant Navy I had to do a daily check on the emergency battery banks used to power the radio equipment. These were invariably sets of 2V cells wired to deliver 24V and two complete banks of the same (main and reserve). Each bank was at least 400Ahr @24V. One occasion I...
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