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  1. FuZZ1L0G1C

    Comedy Thread

    I lay in bed, pondering how wonderful nature is. It was a clear, warm evening. Beautiful weather, not a cloud in the sky. I gazed up at the Milky Way, watching distant stars twinkle like diamonds. Then, a thought came to me.... "HEY - WHERE THE HELL IS MY ROOF!!??"
  2. FuZZ1L0G1C

    Distant Relay Module Circuit Help

    As already stated the small time delay is insignificant if you just plan to switch appliances on or off. Electricity travels at 300 000 Km / second, or 300 million meters per second. Reversing this, it will travel 1 meter in 1/300000000 second. So even a 10-30 meter run will be faster than the...
  3. FuZZ1L0G1C

    Solar astronomy taken to a new level for me

    Fascinating shots of Sol. Regarding solar tracker - If I still have an ancient 80's library-book photocopy from an astronomy reference book, I'll upload the article with the hand-drawn sketch. The author used a geared base and (I think) a 12VDC motor, a second base atop that with a 'correction'...
  4. FuZZ1L0G1C

    Teaching myself LTSpice-XVII & Diptrace....

  5. FuZZ1L0G1C

    Electronics help

    (3*(10^11))/f = Full wave length mm. 3E08m = c = velocity of light (EM radiation) f in Hz. So half wave is FWL/2 and quarter wave is FWL/4 The symbol for wavelength is the Greek Lamda which looks like an upside down lowercase y. Unicode character.
  6. FuZZ1L0G1C

    Compilation of useful electronics software

    For those interested in simulating digital circuits, CAD, signal generation etc, ABACOM Electronics in Germany has demo versions to try out at http://www.electronic-software-shop.com I have one of their products, Profilab Expert, which is the digital simulator. Mine is the full retail licensed...
  7. FuZZ1L0G1C

    Frankenstein's Components.

    Over past decades, have stripped down old dot-matrix printers for gearing and stepper-motors, CD / DVD players, Rare-earth magnets!! :)) from a microwave oven, (discharged HV cap using HT gloves & damp salt-soaked sponge). Dozens of 6VDC relay boards from factory sale, two huge caps rated...
  8. FuZZ1L0G1C

    Homemade PCBs with a Brother printer - 4mil Traces

    Nicely done - good resolution!! Still planning to buy transfer sheets as advertised at our local RS electronics. Not sure how my Samsung M/F will print them..
  9. FuZZ1L0G1C

    Troubleshooting PCB

    Hello Shahin. I'd say your best best is to look around the resources section of this forum to get some basic theory, look in your local bookstores for basic electronics, basic electrical books. If it's inside your budget, a number of companies may offer courses. Better to walk before you run...
  10. FuZZ1L0G1C

    Faraday cage?

    For visibility of your machine, an expanded-mesh wastepaper basket will serve as a good Faraday cage.
  11. FuZZ1L0G1C

    Comedy Thread

  12. FuZZ1L0G1C

    Difference? Regular resistor and a current limiting resistor?

    I=V/R (ohm's law) Some also refer to a series resistor in a current-limiting configuration as a 'dropper'. ----------------;;;;====================;;;;----------- V.in ;;;; V.Drop across R ;;;; Lower V.out=Less I Higher R=<I
  13. FuZZ1L0G1C

    For Sale: Osciliscope, Power Supply and Function Generator SOUTH AFRICA

    Photos, expected price, and town/city so prospective buyer can decide if travel worth it.
  14. FuZZ1L0G1C

    RF sensor to detect cat

    ... with a sound-activated relay trigger, as long as the dog's farts aren't too noisy!!
  15. FuZZ1L0G1C

    Pots!

    "potty training" ... :)
  16. FuZZ1L0G1C

    Where to find scrap electronics?

    Your local electronics components supplier may have a "bargain basket" section, where discontinued or non-moving stock is reduced to clear. When purchasing some new components for my stock, I discovered this collection of (among others), vintage caps, pots, panel-meters, ganged tuning...
  17. FuZZ1L0G1C

    Connecting car battery to a portable speaker.

    If you want to ensure which is positive and negative, open the casing, then on the PCB near where the supply wires are connected to, look for an electrolytic capacitor, marked (-) on the negative lead. Trace this back via the PCB's copper tracks to the negative supply wire. The same applies to...
  18. FuZZ1L0G1C

    How to test a capacitor

    Colloquially, the Volts/Ohms/Amps DMM's are known as "Electrician's or Electrical test-meters", whereas the ones that do Capacitance, Frequency, Diode test and Inductance are often advertised as "Electronic test-meters". You can also browse the web for multiple "Capacitance meter" project...
  19. FuZZ1L0G1C

    Oscillator

    aka Multivibrator. Very simple operation - One base switches its transistor on first, due to tolerance imbalances between components. (eg Q1). That capacitor, C1 discharges through Q1 c-e junction, completing ground-path for C1. Due to discharge, other plate of C1, connected to Q2b, gets pulled...
  20. FuZZ1L0G1C

    LED's to use with speakers

    Assuming V (Vcc in equation) is 20V Rs=(Vcc - Vf)/If Vf = LED forward voltage - is this the 'FW Supply' you mention? 'If' is the LED forward current. Cooler effect? Colored ultra brights anti-parallel. U/B rating 3V 30mA (0.03A) so Rs = (20 - 3) / 0.03 = 17/0.03 = 566R (560R standard value)...
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