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  1. FuZZ1L0G1C

    How is a brass gear removed from a DC motor?

    Hi. I have salvaged a 12 VDC motor from an old tyre-inflation compressor pump. My plan is to replace the weak 3 VDC motor in my portable, rechargeable mini-vac for car with this 12 V motor, which can then plug directly into the cigar-lighter via the DC socket & 'run' switch. Both motors are...
  2. FuZZ1L0G1C

    Cavity resonator - construction?

    I found this hand-drawn sketch from several decades ago, which was given to me by a TV repair technician. The resonator was intended as a "notch" or "narrow bandpass" filter to receive only one terrestial TV station (in those days, I wanted to try pick up a weak TV broadcast, BOP TV). As it...
  3. FuZZ1L0G1C

    Magnet as workbench swarf-sweeper, and compass

    Cleaning swarf (iron dust) off a magnet: While cleaning up ferrous metal filings recently, using a super-magnet from an old microwave's magnetron, I realized that trying to get the metal dust (swarf) off the powerful bare magnet was easier said than done! Eventually, through pulling clumps off...
  4. FuZZ1L0G1C

    Did you Know #0001? - Diode color bands

    Most diodes I've come across have the part number printed on the body. This small glass diode however, uses color-band coding instead. The idea is probably that the small dimensions on a cylindrical surface would not create clear enough numbers, especially when mass-produced at high speed...
  5. FuZZ1L0G1C

    Rotary tool - what battery V and what Vmax for motor?

    Hi. Regarding the 'Speed-Matic' rotary tool. I've had this 'As-seen-on-TV' mini-drill / rotary tool several years, rarely used these days. I mislaid or lost the original wall wart that came with the kit. Did not realize the rechargeable cells have been leaking electrolyte. Now want to remove...
  6. FuZZ1L0G1C

    Are these MIDI-related IC's?

    Hi. While having a MEDELI M1 musical keyboard stripped down, I decided out of technical curiosity and self-teaching of how a MIDI keyboard works, to attempt to trace the MIDI part of the circuit. Besides that, I am also tracing the (faulty) power supply, and the amplifier section. Wondering...
  7. FuZZ1L0G1C

    What type of synth key is this?

    I'm in the process of doing multiple repairs to a damaged Medeli M1 keyboard. The first octave has most of the white key stoppers snapped off. There are several musical equipment stores around us (South Africa), but some don't show clear sketches or dimensions on their web sites. If I can get a...
  8. FuZZ1L0G1C

    Biefeld-Brown effect (high voltage 'flying' discs?

    This may belong in the Woo-Woo category, as I'm not entirely sure that the experiment was real or a clever hoax. While paging through some older paperwork, I came across this photo-copied article from Omni magazine, several decades old, describing an experiment supposedly performed at a...
  9. FuZZ1L0G1C

    How to create your own electronic symbols using ALT-codes or UTF-16:

    When typing in equations, or adding a unit symbol to a value, there may be a need to generate a specific symbol. On the taskbar of this window you can see omega Ω and micro μ, but what if you want more? Or maybe you want to create these offline. Most electronic symbols can be found in the Greek...
  10. FuZZ1L0G1C

    Toroid core types by color ID?

    Hi. What does the color signify on toroidal cores? As most articles I've seen so far don't list this specifically, but do mention certain cores such as compressed ferrite having different magnetic permeabilities between the material types. So I wonder if color = "core material" code? At first I...
  11. FuZZ1L0G1C

    Optical mouse interrupts being ratty?

    My computer at home has been randomly opening windows, selecting icons or task-bar items lately, often when I move the Genius 3-button optical mouse across the screen, without touching buttons. I also found at times it will do this even when not moving or touching the mouse. When this happens...
  12. FuZZ1L0G1C

    Which BB>XHTML parser is used & errors in BB help

    Hi. Parser? Is the new Electronics Point / EETech still using Xenoforo, or phpBB? If either, which version? Can I download parser software or the html parser / tester package?, .. as phpBB.com provides a downloadable app from their site called SCEdit. The user opens Example.HTML then types in...
  13. FuZZ1L0G1C

    Directive RF through 2ft concrete to pickup?

    Hello. Want to follow and trace a paint-peeling leak mark in basement garage to the floor above this plinth, which is a passage near the bathroom. I suspect a galvanized steel (or copper) pipe has rotted from old age, and is buried somewhere under the floor. I want to build a coil or other...
  14. FuZZ1L0G1C

    Tricks with macro photography

    Electronic submissions often require a clear closeup (macro) photo of the subject. For those that own a DSLR (removable and interchangeable lens), here is a compilation of a few handy tips and tricks. Based on a Pentax K2000 SR automatic, the reader can modify where applicable to suit camera...
  15. FuZZ1L0G1C

    MOV blown on NiMH 4xAA cell charger - cause?

    Hi. My NiMH 4xAA cell charger is manufactured by "Duracell", the rechargeable batteries I bought are "Energizer recharge" 2300mAh each, ACCU NH15 1.2V NiMH - HR6. I have started using rechargeable cells with this recently bought charger as my power-hungry DSLR Pentax eats alkalines at an...
  16. FuZZ1L0G1C

    Opto or IR sensor, what type?

    Hi all. I have dug out a small project built several decades ago. This is basically an opto or IR detector circuit, which originally illuminated a 3mm red LED when input was sensed. I added a jack socket across the LED for connecting to a scope / amp / sound-card input etc for monitoring. Very...
  17. FuZZ1L0G1C

    M87 SMBH, Geodesic & Astrometric VLBI, cross-correlation interest

    Our local newspapers recently published a released image of cluster Galaxy Messier 87's super-massive black hole, obtained through Very-Long Base-Line Interferometry. For those who don't know, this is a correlation of multiple far-flung radio-telescopes located on planet Earth. This creates a...
  18. FuZZ1L0G1C

    Changing compromised Login details?

    Due to a recent spate of trespassing / burglaries by a neighbor, I suspect that my account details have been compromised. On my computer desk at home, I had a list of all forums / websites containing my details, to compensate for my forgetting these. This includes real name, website, mail url...
  19. FuZZ1L0G1C

    shoX mini speaker interconnecting (stereo) cable wiring?

    Hi. For several years, I've owned a pair of shoX ESX101 TEVO mini speakers. These use a 3.5mm stereo - to - 3.5mm stereo for audio out, say from a mobile phone etc, to LINE (in) of shoX. Charging the internal battery is via a mini-USB (picture shown) to standard PC USB 2.0 for 5V DC. The...
  20. FuZZ1L0G1C

    Nerve/Brain/Muscle spike sensing

    Hi all. A thought that has been playing around recently. While In hospital for past week for a Grand Mal Seizure, I had a sensor / data recorder strapped to my waist, with a few dozen sensors super-glued to my now clean-shaven head. Every time, before a seizure the limbs convulse before...
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