Recent content by FuZZ1L0G1C

  1. FuZZ1L0G1C

    Electronics Mortuary

    Is smoking a capacitor allowed during the COVID-19 lockdown? :) (just asking)...
  2. FuZZ1L0G1C

    Comedy Thread

    My optic nerves are now corkscrewed, thanks!! :D
  3. FuZZ1L0G1C

    Please help with info about a HOT-WIRE Supply kit

    If not used for polystyrene foam-cutting, a good hot-wire supply may be useful as a constant-current, low voltage power source. As the nichrome wire of a hot-wire cutter heats up, its resistance changes, which if fed with a constant voltage source, has the disadvantage of the current (and watts...
  4. FuZZ1L0G1C

    Attract fish by sound, light or anything else

    While not claiming any expertise in the 'fish-calling' field, wouldn't any sound transmitted into their environment more likely scare the fish off? The vibrations may be interpreted by the fish as an approaching predator, or alarm 'clicks' of the school. There are artificial lures that pop or...
  5. FuZZ1L0G1C

    How is a brass gear removed from a DC motor?

    Hi, apologies for the delayed reply - been so busy with other work I haven't had a chance yet to return to the above task. Will update when work on it resumes..
  6. FuZZ1L0G1C

    How is a brass gear removed from a DC motor?

    She uses my larger blowtorch as a flamer :D .. Better lock my heat-gun away! :p
  7. FuZZ1L0G1C

    Cavity resonator - construction?

    Thanks for info. Plating is no problem, as there are numerous businesses around here that offer this service. I'll bribe our local plumber/electrician to sell me an old, discarded geyser with copper vessel. Or sheeting may be available at a metallurgist. There may even be ham / waveguide dealers...
  8. FuZZ1L0G1C

    How is a brass gear removed from a DC motor?

    Thank you for helpful replies. Now that I know definitely that the gear is press-fitted / heat-expanded onto the shaft (or axle), and not screwed onto a threaded axle, makes further work easier to plan. Yes, the pinion gear is butted close to the bearing, making behind-the-gear shaft access...
  9. 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...
  10. FuZZ1L0G1C

    Cavity resonator - construction?

    Thanks for the prompt reply, Dave. Now... In your supplied PA2MRX schematic, the signal conductors from (BNC?) connectors are drawn as if both shorted to ground, on left. Is this correct? If so, then is BP resonance controlled by adjusting the air gap between signal and ground (if 6mm top...
  11. 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...
  12. FuZZ1L0G1C

    Attract fish by sound, light or anything else

    dynamite 'em
  13. FuZZ1L0G1C

    PWM shielding

    Velocity of light & electricity c=300 000 000 m/sec. A 2 meter length of wire has a full-wave resonance of 300E6/2 = 150E6 Hz. A single length of wire resonates strongest at quarter wavelength, so peak resonance radiates at 150/4 = 37.5E6 or 37.5 MHz. Twisted pair effectively shortens each...
  14. 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...
  15. 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...
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