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  1. Sunnysky

    How to differentiateLed's intesity/frequency in between fade in/out and slow blinking?

    What is the real problem. Is it choosing a threshold or rate of change at that threshold.? Adding a capacitor makes the problem worse by slowing the response and making them look the same. So remove that. By differentiating with series C and load R, to get the slope voltage dV/dt combined with...
  2. Sunnysky

    Transistor prototype photo

    They were extolling amazement that the 1st transistor was even smaller than sub-miniature tubes.
  3. Sunnysky

    Transistor prototype photo

    ------ I recall reading pre-Covid that TSMC was pushing the technology to achieve an economical yield of 5nm SDRAM. This new technology required much higher activation energies in a vacuum and I suspected, arcing or Partial Discharge was causing lower yields. But I'm a bit hazy on the details...
  4. Sunnysky

    How do I motivate myself to study with 100% focus and concentration during covid lockdown?

    Pretend you are a film director doing your life story in the future. Write the plot of your success. Believe it then do it.
  5. Sunnysky

    OOPS! I MEAN BIG OOPS, MAYBE. ROOKIE MISTAKE

    The impedance coupled by wires is very high so to get 5 mA m-2 which means per meter squared, you would need 10kV of audio if the coupling reactance was 2 kOhm More likely bacteria (Septic arthritis, likely caused by an organism of the Enterobacteriaceae family) or posture or age related...
  6. Sunnysky

    4.5v or 6v for a 5.6 battery

    If you could add a series diode to the 6V, that might do for now. If you don’t and use the 6V, you’ll be looking for a new shaver this year.
  7. Sunnysky

    Programming a stepper motor with Picaxe

    Does the USB port work? I was impressed with my setup with open windows software Gcode Panel to an UNO with a $24 CNC shield on a 12V supply . Using gcode downloaded to UNO and Gcode Panel on a laptop. Watch out for motor supply ground noise if connected to an earth grounded tower interfering...
  8. Sunnysky

    Exceeding rated current for power input connector

    Barrel jacks don’t have enough surface area on the pin to support this current. since it is >2A they are not gold plated and will slowly oxidize until hot then melt the plastic. Consider twinning pins on PC MOLEX plugs for HDD’s as a cheap bare minimum solution.
  9. Sunnysky

    Which speakers are best for home?

    I used to have Definitive towers. Now we just use 8$ speakers from a recycling store . Yamaha small speakers on both ends of the couch back and a sub-woofer in the lower big drawer of a wall unit . This comes from a computer with wireless keyboard with volume control that also displays 1080p...
  10. Sunnysky

    4.5v or 6v for a 5.6 battery

    4.5V will not charge it enough and 6V may over charge and kill the batteries with heat. Use what is specified. 5.6V current limited to 80 mA
  11. Sunnysky

    replacing two D cells with pair of 18650 batteries but need voltage drop

    HT7330 3V LDO has a 100mV dropout @ 40mA and draws only uA's
  12. Sunnysky

    Can someone show me how to install a digital/mechanical counter on a device?

    In the 70's I used the 1st LED calculator to do this using +1 = = = = = = = using an analog switch to duplicate key presses $10
  13. Sunnysky

    Privacy lost

    I don't care if they can see me, find me or see my metadata on searches. I have nothing to be ashamed of or to hide.
  14. Sunnysky

    How to remove D-Protection on LG Home theater

    Factory reset= hold down zero key on remote and Then Stop button on unit for 5 sec without a disc inside
  15. Sunnysky

    How do I remove the D- protection from my mini hi-fi system CM8430

    it appears that DVD domain does not match origin of disk played. Foreign unit.
  16. Sunnysky

    How do I remove the D- protection from my mini hi-fi system CM8430

    Why do you want to?
  17. Sunnysky

    Yamaha HTR 2064 - Not Powering ON

    I replaced all the ecaps in my 1980 yamaha FM Rx 25yrs ago. still works. Most likely fault.
  18. Sunnysky

    Old TV Power Supply Issues

    Q801 is blown open and thus no regulation of 126V. A power zener-like shunt regulator is needed to bring down the power bypassed by the 20W bypass resistor. Observe temperature when replaced for excessive heat dump or inadequate cooling.
  19. Sunnysky

    Led driver of constant current - is it really constant ?

    My faux pas for calling it an OC comparator, rather it is any Op Amp with Q2 as a common emitter current sensed (voltage controlled) current sink. Rb/Re=30~50 for ~any Q2. Any silicon diode will work instead of Q1 , C to reduce startup current of diode voltage source. Otherwise no change in...
  20. Sunnysky

    JAKES LADDER

    Strong thermal convection forces the flame upwards of >6000’K until extinction voltage is achieved by gap width. Negative resistance of arc is limited by PTC of a tungsten series current limiter so a new arc is less likely to begin from the bottom at the same time as a higher arc. Too small a...
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