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  1. FuZZ1L0G1C

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

    Thanks for replies. @Bluejets #2: identical to your photo, except (Ni-Cads?) which have bigger dimension at 23mm dia and 80mm total length. @dave9 #3: counted 3 cells in series, look like shortish D cells, silver-colored. ^^^^^ 3 cells 4.2/3 ^^^^^ =1.4V per cell? Cells too flat to run motor...
  2. 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...
  3. FuZZ1L0G1C

    Are these MIDI-related IC's?

    Some not-so-sharp photos taken with cell phone camera at it's closest focusing distance. Reduced size 37% from 1600*1200 to lessen forum footprint. The 2 IC's marked with red "+": The 8-pin DIL (MC4558L) is shown top center and the DIP-12H (TA8227PL) is left, under it's heat-sink. Temporarily...
  4. FuZZ1L0G1C

    Who makes this plunger switch with an " S " on it ?

    Looking though KrisBlueNZ's table of logos at https://www.electronicspoint.com/forums/threads/logos-for-electronic-component-manufacturers.272015/ I see several that have similar 'S' shapes - not to say it is a manufacturers' logo.. may be a part number / rating (8, 8A, "S" for "Switch")? or an...
  5. FuZZ1L0G1C

    Are these MIDI-related IC's?

    Thanks for reply. Searched all PCB's - only those two listed - not life-threateningly important - was just to see if I could match Frooty Loops input to a 'known' listed MIDI device. The downloaded MEDELI M1 PDF user manual says "New USB Audio Device" should show when connected. Will upload...
  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

    Book Reviews

    MY BAD!! Sorry, I should have titled the book in my post #50 VISICALC For Engineers, not Visual Basic. Visicalc was the first spread-sheet program for computers (c. 1977-1978). Which means the 'disc' mentioned in the book was probably a floppy. There are (or were) downloads available of the...
  8. FuZZ1L0G1C

    Flyback transformer?

    Taking the equation 1/(2piC), 47μ is 3.386 KHz while 4μ7 is 33.8627 KHz a big difference of 10x frequency / rolloff (or discharge time).
  9. 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...
  10. FuZZ1L0G1C

    Comedy Thread

    Jack: "I'm worried that our dog hasn't returned home in over six weeks.." Vet: "Did you place an notice as I advised in the classifieds?" Jack: "Yes, but no response so far". Vet: "What details did you put?" Jack: "Here, Boy!" Jill: "Our budgie has be gone for a month, already". Vet: "Maybe if...
  11. 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...
  12. FuZZ1L0G1C

    Frankenstein's Components.

    PVR (Personal Voice Recorder) This was originally bought as a mono-channel recorder for transcribing 'music' pieces from my then PC-speaker output. Years later, we acquired an African-Grey parrot named "Wonk" by my then teen daughter. I hauled out the non-used PVR and extended the...
  13. FuZZ1L0G1C

    Book Reviews

    Visual Basic For Engineers. Copied all 400 pages of this book years ago from a public reference library, it (obviously) no longer has the CD-Rom referenced in the book's text, but very useful equations with explanatory sketches, covering a wide range of engineering applications. These include...
  14. FuZZ1L0G1C

    Early 1970's Fairchild Transistor Question

    The EN prefix is simply the Plastic-bodied equivalent of the 2N. Reason for "E" obscure, but the Fairchild / SGS (Società Generale Semiconduttori) may have thought "plastic Encapsulation".. Here's the data from an old 1973 T.I.T.S. .....
  15. 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...
  16. FuZZ1L0G1C

    ID 8-pin DIP

    Exactly. I coudn't have bet it putter meself. :D
  17. FuZZ1L0G1C

    Flurescent Lamp possible ballast issues

    The 'caps on ohms scale' test is not intended to measure resistance directly. On a meter (preferably analogue), the series voltage of the resistance test supplies a small charge to the cap. You could also charge it with a battery less than WVDC rating of cap. ++&-- for polarized caps. Testing...
  18. FuZZ1L0G1C

    Help creating a LED flasher PCB

    You could series 2x 3.7 cells to create 7.4 DC, as Vcc, then for the 5 V, modulate a higher frequency 555 with the one second 555 astable. Output should be buffered with a darlington pair transistor if total LED strip load exceeds 555 capability. Or use a 556 if u have in stock. 2x matched 555's...
  19. FuZZ1L0G1C

    Flurescent Lamp possible ballast issues

    First check if your lamp-holder contacts are making proper connection. They may be stretched open from wear or oxidized. If your 'voltmeter' is a multi-meter, meaning it can measure ohms, volts, amps (at least), and hopefully has a diode test function and capacitance range as well, you can start...
  20. 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...
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