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  1. flippineck

    125 degree C electrolytics by Su'scon

    Red arrowed ones are the 125 deg C capacitors. All the rest are 105.
  2. flippineck

    125 degree C electrolytics by Su'scon

    I'm attempting to repair a 22" HP LCD monitor.which powers up in a very delayed fashin, by replacing the electrolytic capacitors on the power board. I've obtained most of the capacitors I need very easily, but three are proving very hard to obtain the identical spec to that currently fitted...
  3. flippineck

    Combined buck & boost converter?

    Thanks folks.. might be a silly question to some but, any suggestions for good places to look for suitable buck-boost converters? I'm only really familiar with Ebay & have spent quite some time rooting around there. I did see some self-stalling blades but assumed it was no more than a...
  4. flippineck

    Combined buck & boost converter?

    I gave up trying to use a car alternator as a wind turbine generator, and simply bought a purpose-made PMA generator as a base for my wind power project. Some idea of the characteristics of the generator (some figures manufacturer-given, others interpolated & guesstimated, I imagine also the...
  5. flippineck

    Auto star-delta PMA alternator switchover

    Thanks. I've actually come a-cropper at the stage of trying to remove one of the claw poles from the alternator shaft. Typical me - couldn't wait for the machine shop to open so I impatiently tried pressing ahead & squeezing it off in the vice using various bits of shim, judicious and careful...
  6. flippineck

    Auto star-delta PMA alternator switchover

    Trying to convert a car alternator into something suitable for a wind turbine project here. You can buy pre-made PMA alternators for wind turbines on ebay however decent ones are very expensive and virtually all only seem to be available from US-based sellers, which adds a huge postage and tax...
  7. flippineck

    PWM generator

    I need to come up with a cheap and simple Pulse Width Modulation square wave generator with the following parameters: Power source: 12V SLA battery Data low: adjustable (trimmer ok) 0V thru +3V Data high: adjustable (trimmer ok) +5V thru +12V Frequency: adjustable (trimmer ok) 50 -100 Hz Duty...
  8. flippineck

    Do SLA chargers fight if paralleled?

    No live testing at all as yet. Definitely in the shed stage at the moment. The alternator pulley on the focus seems to be about half the diameter of the crankshaft pulley so i guess that makes for a ratio of 50%. In my experience charge warning lamps seem to go out round the 700,800 rpm mark...
  9. flippineck

    Do SLA chargers fight if paralleled?

    I have a set of 3 'leisure' SLA batteries, all broadly similar in terms of age and rated capacity, connected in parallel, powering a handful of very low power equipment - a small LED nightlight type device and a small alarm system. Very very occasionally an inverter which supplies 240V AC to...
  10. flippineck

    Lead-acid vehicle battery discharge time

    Not sure by any means but I'm guessing at the issue being 'sulphation'.. ? After coming to the end of the line cleaning and tightening terminals, insulating loose ends of previously chopped off loom etc, I took the battery off the vehicle and gave it a good long charge at 14.7V followed by a...
  11. flippineck

    Lead-acid vehicle battery discharge time

    Just got me thinking there.. I recently changed the starter motor. When doing so I noticed an extremely heavy black-sleeved cable terminated in a big fat lug, under one of the starter mounting bolts. Without really giving it much consideration I just thought "big powerful motor, big powerful...
  12. flippineck

    Conversion of decimal to binary

    ChosunOne - absolutely! sorry about that, you're quite correct ;-)
  13. flippineck

    Conversion of decimal to binary

    from https://www.rapidtables.com/convert/number/decimal-to-binary.html 124,375 ---> 11110010111010111 124.375 ---> 1111100.011 I think the number just grows from the right, same as base 10 does? i.e. 0 --> 0 1 --> 1 2 --> 10 3 --> 11 4 --> 110 5 --> 111 6 --> 1000 . . rightmost figure is...
  14. flippineck

    Inverters

    Watch out as well for the cheaper inverters that claim a certain power rating but fail to deliver it for a number of reasons. I bought one from a Chinese Ebay supplier that claimed '3000W / 6000W peak' but in practise it only seems to be able to reliably cope with much less. Connecting a 2400W...
  15. flippineck

    Lead-acid vehicle battery discharge time

    You must have caught my post before I'd edited out the time calculation, which I'd erroneously had at 4 days I think.. yep, I rechecked my maths & came up with 68 Ah / 0.008 A = 8500h or approx a year. My battery went flat after one day of non use & having measured what's being taken with the...
  16. flippineck

    Lead-acid vehicle battery discharge time

    Assuming a car battery starts out at time zero, three-quarters full and 10% into it's useful lifespan, how long would you expect it to last, switched off with the key out, before it's no longer able to supply enough current to turn the starter motor? Battery type - sealed lead-acid; Drain with...
  17. flippineck

    LED for electric heater (UK)

    reminds me of how a fish tank heater I once had, worked. neon seems a good idea to me..
  18. flippineck

    LC56 A 383 8 PIN DIL IC

    Thanks Harald, good find. I'm trying to neatly power four dashcams in my car, three in the windscreen & one in the rear. Out of the box, each (identical) dashcam comes with one of these cigarette lighter plug-in psus. Four psu's all together in a 4-cigarette lighter adapter in the dash take...
  19. flippineck

    LC56 A 383 8 PIN DIL IC

    Standard 8 pin DIL IC marked thus: A LC56 ___ 383 It's on a small PCB along with a diode, a red LED, 2 electrolytic caps and an inductor. The PCB is marked ZB195-1 161030 the PCB is attached by 2 flying leads marked V+ and V- to the terminals of a standard car cigarette...
  20. flippineck

    Magazines

    I remember a late 1970's issue of ETI which contained a design for a BFO / Beat Frequency Oscillator metal detector, spent ages building it as a young lad, the bugger never worked despite the help of several family friend eggheads :-( strongly suspect I fried the transistors with my 10 year old...
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