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  1. FuZZ1L0G1C

    Sta-2100D

    @tomcat65 Re spacebar problem. Suggest a new keyboard (quite cheap things). Then wash the old one, strip down and allow to dry completely. My spacebarwasdoingthesame until I replaced keyboard. :D
  2. FuZZ1L0G1C

    Comedy Thread

    was just reading a thread about animated emoticons. Not an emoticon as such, but Some days..
  3. FuZZ1L0G1C

    DEFY magnetron - stuck with removal?

    Update: Problem fixed. First tried heatgun / ice for thermal shock, then screwdriver whacked with hammer, then vicegrips, which kept jumping off. Eventually, the solution was to remove the entire base-plate, which gave me full access to the bottom light-box screw, which a 6mm diameter...
  4. FuZZ1L0G1C

    What solid state components can switch composite video (AV)?

    Fascinating and useful info, thanks. Here in good ol' RSA, a shopping mall near us had a gadget/electronic/astro shop called 'Zoom'. This has unfortunately either moved or ceased to exist. They kept various types of video-based active switching consoles. Whenever I passed them, I was a 'kid in a...
  5. FuZZ1L0G1C

    What solid state components can switch composite video (AV)?

    Will re-design around relays, thanks. At our 'Hi-Fi Corporation', only seen simple HDMI multi-to-one device switching devices, will check further, thanks.
  6. FuZZ1L0G1C

    What solid state components can switch composite video (AV)?

    Our TV is quite an old model, an LG Golden-Eye CRT. This has 2 AV inputs, one doesn't work, so let's say one AV(1) in. One AV out. Has RF ANT in / out. The DSD is AV out, currently to TV's AV1 in. The DVD/FM uses AV out (for DVD movies). A VCR can use AV in/out or RF in/out. The PVR is AV...
  7. FuZZ1L0G1C

    DEFY magnetron - stuck with removal?

    Thanks for helpful replies @73's and @kellys. Been a bit busy so haven't really tackled it much further yet. Using my 45 degree 'tape-head-inspection' mirror, the stuck screw is definitely star-point, but with a domed head profile. As for 'shocking', i'm planning to try a nozzled 2000W heat gun...
  8. FuZZ1L0G1C

    DEFY magnetron - stuck with removal?

    Hi. Yesterday, my DEFY microwave oven model DMO367 MWM 2030W fried its magnetron, and the silver-coated waveguide cover that clips into the cavity inlet slot. Beautiful orange corona discharge through the w/g cover, melodious 50 Hz arcing heard, pleasant aroma of burnt ceramic. The micros I've...
  9. FuZZ1L0G1C

    Zero ohm resistors.

    I have some of these (same as@Chemelec 's photo) #15. A few loose ones came with a box of 3.9V zeners that I bought from an emigrating tech. Never knew what they were.. Diode test failed, as did inductance and capacitance. Of course, resistance on DMM hunted between 0 to a few mΩ. Now I know...
  10. FuZZ1L0G1C

    Comedy Thread

    say WHAT??
  11. FuZZ1L0G1C

    Tips on tracing complex PCB circuits:

    Nothing is more frustrating than spending an hour or so tracing both sides of a double-sided PCB, drawing it or noting routes on paper, only to find that somewhere, you mistakenly traced a different track when flipping the board. A lightbox below the PCB can assist in seeing the opposite side's...
  12. FuZZ1L0G1C

    Frankenstein's Components.

    Before discarding old superglue applicators, tippex correction fluid, pill bottles, or any smallish plastic container, these can be put into use as housings for small electronic circuits or component bins. The nozzle types are especially useful for testing/probe circuits, such as a logic probe...
  13. FuZZ1L0G1C

    Audio Circuit Collection

    Interesting circuits on supplied links,thanks. Hi K.E. Was this a web download, if so, where from? Looks interesting, would love to check it out. Re 17 Gig: Maybe duplicate copies of schematics could be converted to smaller dimensions, grayscaled, and / or converted to a another format, then...
  14. FuZZ1L0G1C

    Winding own coils? Calculators / Formulas / Theory.

    For those interested in designing / winding their own coils, here are some (hopefully) interesting links. The articles include formulas, theory, and design considerations. A number of them have internal links to different coil types (planar, helical, etc). Some are simply on-line calculators...
  15. FuZZ1L0G1C

    Is this part of a GPS antenna?

    While a Garmin Nuvi was open on the workbench, (for loudspeaker mod), noticed a device I have never seen before. At the top of the board, coming from the shielded RF section, there is a short trace which connects to the (arrowed) rectangular block of yellow translucent (plastic?). The other end...
  16. FuZZ1L0G1C

    Car horn as speaker for musical keyboard

    A horn speaker (ie Megaphone type) uses a driver (voice-coil and magnet) with several folded horns in front. Although suitable for amplifying the human voice, trying to reproduce the full range of a musical keyboard through any type of horn is difficult, if not impossible. As already mentioned...
  17. FuZZ1L0G1C

    Add line out to speaker-damaged Garmin GPS?

    Hi 73's. Thanks for the URL links (which I'll look through). The GPS is a Garmin Nuvi 1300LM model. Since posting yesterday I have re-opened the unit to re-test all and try another idea. Update / correction to parameters: The loudspeaker is a 30 mm * 15 mm rectangular cloth diaphragm, facing...
  18. FuZZ1L0G1C

    Casio WK3800 keyboard won't switch on

    If, after doing @73'sDe Edd suggestion of plug looseness test you find that your DC socket is suspect, you can possibly fix it yourself quite easily. The socket (on keyboard) should have a side-entry spring contact inside the barrel when viewed from socket entry. Remove batteries, if in, to...
  19. FuZZ1L0G1C

    Add line out to speaker-damaged Garmin GPS?

    Howdy y'all. My Garmin Nuvi GPS was caught in a heavy rainstorm several weeks ago. I opened it to dry everything for 24h atop an oil heater (low heat). All GPS functions still work, except the small loudspeaker, which is now barely audible. I think it's the speaker, as I plugged a temporary...
  20. FuZZ1L0G1C

    433MHz door bell - Tx antenna feed

    Hi Cirkit. If you have a flatbed scanner, or access to one, scanning the board placed directly on the glass gives quite a clear image, as long as there aren't any larger components, as SMD component faces should be at focal point (glass surface).
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