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  1. kellys_eye

    Any Advantages of Tubes (Valves) Over Solid State & Microelectronics?

    Tubes have (or maybe 'had') advantages when it comes to RF. You can abuse a tube RF amplifier without much consequence but such abuse will kill a solid-state system (unless fitted with multiple redundant error detection systems) in a microsecond. Building high output systems with only one or...
  2. kellys_eye

    Home Based Income as an Electronics Hobbyist

    Mix of three actually - BIR, authentic and some my own recipe. Had a curry in one of Glasgows 'finest' eateries last weekend - awful. Seriously. I have no idea how they get away with it!
  3. kellys_eye

    Home Based Income as an Electronics Hobbyist

    ??? of course you can make money at ham radio! I note many people are making/selling long wire antenna kits for example. Loop antennas are also gaining in popularity and, if you have any mechanical skills and tools, then making morse keys and/or paddles can turn a decent profit. Thing with...
  4. kellys_eye

    Home Based Income as an Electronics Hobbyist

    Knowledge? 10 years as radio operator (merchant marine), 10 years as lecturer in marine electronics, 10 years as (global) field engineer/fault fixer, 10 years self employed in marine (yachting) electronics repair, 10 years as a cook...... Yup, the last 10 years I've been making/selling...
  5. kellys_eye

    Delco Radio CDM Troubleshooting and Component Identification

    The 'SFH' thing is a filter for the radio signal path and won't be faulty - leave it well alone! Given the fault symptoms I'd be looking at the control head rather than the main unit. Dodgy keypad contacts (common) and potential issues with a data signal between the main unit and the head...
  6. kellys_eye

    Home Based Income as an Electronics Hobbyist

    If you have the knack of recognising the value of equipment and/or the potential faults/repairs necessary to maintain them then you could try scouring the local ads for dud (or semi-dud) equipment under the names of 'spares or repairs'. In this way you can obtain equipment cheaply and with the...
  7. kellys_eye

    Scoreboard repair

    I'm still mystified as to the differences in volts from those regulators as the boards (master or slave) are, basically identical aren't they? Certainly if the regulators all power those MKL25etc devices they should all have the same supply voltage (give or take). Are you sure the supply IN to...
  8. kellys_eye

    Home Based Income as an Electronics Hobbyist

    As mentioned, repairing and/or restoring 'vintage' electronics is a growing market and one not yet fully exploited so there's room to grow if you get in 'on the bottom'. There are vintage radio/audio/TV sites on the web that would be a good place to gain knowledge but us oldies have a...
  9. kellys_eye

    Home Based Income as an Electronics Hobbyist

    You could look for areas of specialisation such as the marine market or even CB radio. But much of today's requirements revolve around liability and thus a need for appropriate insurance that may, itself, demand proof of ability (not happened to me but that was 10 years ago - the market has...
  10. kellys_eye

    Scoreboard repair

    Something isn't right. The idea that three as-good-as-identical boards have three different voltages coming out of identical regulators that are supposed to have a FIXED output (usually within a few % of the stated value too) points to a problem with your measuring device!
  11. kellys_eye

    Need help identifying diode

    We'd need to know more context about the circuitry it came from to discover its value (if it's a zener).
  12. kellys_eye

    Scoreboard repair

    That MLKetc device is a 64-pin device and not easy to solder IN let alone get OUT. How did you manage it? Cut the legs? Does the regulator output rise back to its correct level with the defective chip removed? The MKLetc device operates fro 1.8V to 3.3V, not your usual 5V but since we're...
  13. kellys_eye

    Help to ID capacitor

    To a point. The type of capacitor you refer to has no particular history of developing faults-in-use (that I've ever heard of). Typical capacitor issues revolve around electrolytic types that are commonly the cause of SMPS failure and other supply-related issues in older equipment and they are...
  14. kellys_eye

    Help to ID capacitor

    Why? Are they faulty?
  15. kellys_eye

    Need help sourcing a power transformer

    Using a bridge rectifier the DC output will be 1.414 x the AC input so for the 30VAC secondary this will be 42V ;less the diode drop (call it 2V to be easy) then the UNLOADED DC output will be around 40V - as stated on your drawing. This drops under load to the required 36V DC - it doesn't have...
  16. kellys_eye

    Google nest mini speaker linkage

    Nope - you need the amplifiers input sensitivity. What you show is the amplifier OUTPUT power. If it's 'standard' (should be) then the input sensitivity could be 200mV. You won't find out the Nest output voltage listed anywhere - it's not something any manufacturer lists. This is why you...
  17. kellys_eye

    Scoreboard repair

    I'm guessing that you number the pins left-to-right on the device as it appears in your picture? If so then the RHS pin is the input (normally) and will be a voltage higher than the expected output - not necessarily a lot higher as the device is called a low-drop-out regulator which means the...
  18. kellys_eye

    Failed diodes

    TINSTAAFL - (there is no such thing as a free lunch) Buy cheap, buy twice .... there's loads! Google Murphy's Law!
  19. kellys_eye

    Honda eu10i inverter

    First check that you have clean fuel and air filter. If your Honda is like my non-Honda unit then the carburettor is controlled using a small stepper motor and controlled electronically. Check that the shaft movement is free (not sticky) - this isn't easy but you could do worse than squirt...
  20. kellys_eye

    Scoreboard repair

    What are you using for your reference ground?
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