Search results

  1. Sunnysky

    Power source for smoke detector

    It might be wiser to feed 9V brick DC to all alarms but modern ones now say the CO2 detector is only good for 10 years along with the battery then toss the unit. CO2 detectors are more sensitive than smoke particle detectors.
  2. Sunnysky

    LED specification - All about 3mm & 5mm LED's

    I used to supply 100k 5mm custom LEDs to one customer for over 10 years and discovered the differences that make them special. Tolerances are a quality control factor on the epitaxial wafer. The Vf has a high tolerance on the high side solely due to the ESR which is inversely related to the...
  3. Sunnysky

    1980 Soviet Radio Cassette amplifier problem.

    Richard ... Look for V9-V10= 1.10V difference or (2x)Vbe = 0.55V. adjusted by R38. This controls the Class A output current to about 10mA Your input signal and hiss is too strong so I would highly recommend reducing the gain by adding to 150 to 220 to R32(56 Ohm) this reduces the gain so you...
  4. Sunnysky

    Noise Activated Switch, with a Difference.

    Considering the complexity of selective sound pattern recognition for beginners, I think the easiest solution is a wireless remote control trickle charged by the bell supply and the receiver switch to turn on a light when the bell is active
  5. Sunnysky

    Interpupillary Distance Adjustment on a Microscope Impossible?

    if cylindrical correction is large in your prescription, this can cause distortion. but spherical coaxial and right eye offset spherical correction is std. Other issues like tunnel vision or glaucoma notwithstanding.
  6. Sunnysky

    Electronics Mortuary

    I have a 10" iPad that fits nicely in my back under my pant waist, but recently hard curved chairs in a fast food place proved too much and the glass cracked into a million pieces but still worked. unfortunately entire screen got replaced for 270 $cdn in 1hr
  7. Sunnysky

    Interpupillary Distance Adjustment on a Microscope Impossible?

    although you lost stereo depth perception , at least you have better 2D vision. The unit has coaxial adjustment for this , did you try? unless it was a twist error.
  8. Sunnysky

    LED or CFL flickering with motion sensor in circuit

    If it uses a triac to create some transformerless DC voltage with a small Relay and small LED load the triac may be false triggered by dV/dT noise which must be filtered externally or internally to the triac by some means of attenuation. Often an Incandescent load is enough to prevent this...
  9. Sunnysky

    LED or CFL flickering with motion sensor in circuit

    Add a 30W tungsten lamp to LED supply load to satisfy triac switch for LEDs if possible. ??
  10. Sunnysky

    Interpupillary Distance Adjustment on a Microscope Impossible?

    The Binoculars I have are 50x and at first were not centered yet both in focus. I noticed that I could gently twist the coaxial alignment to make it worse and better and even though it was fairly stiff and elastic, I was able to adjust it and stick to perfect alignment with a bit of twisting...
  11. Sunnysky

    Interpupillary Distance Adjustment on a Microscope Impossible?

    gently twist if out of alignment
  12. Sunnysky

    Playing with valves

    I used MDF to make a DR table extension and matched the grain and colour of cherry wood using a brush and lots of acrylic. I bought a rack and pinion oak slide to,support it so we can fit 14 people around the table at family parties. cool tube photos.
  13. Sunnysky

    Playing with valves

    When I was in EE school in early 70's an older buddy designed his own tube preamp and power amp, bass reflex. Crystal clear, at full volume at full gain while no hiss between cuts. I was impressed when the windows and wall resonated and nice compact ,layout.
  14. Sunnysky

    Running LED - all LED turn ON when reach the last LED?

    You can make them all appear to be on at once by scanning fast without flicker but it would be dimmer since duty cycle is 1/16. But if you can switch a smaller series R during this fast scan, you can run at 15% rated If with ultrabright LEDs then run at 150% or absolute max for experimental...
  15. Sunnysky

    Cheapest way to get data from multiple(100s) of sensors?

    correct.. it would take special optics and different transceivers to improve on this like Irda 2 parts from Sharp/Vishay with 5mm deep tunnel apertures to table. Series driving a row of 10 IR LED x1.2V would need at least 12V-13V @50mA which is far more efficient than MUXing each one. you...
  16. Sunnysky

    Cheapest way to get data from multiple(100s) of sensors?

    You will be much more explicit on behavior for "analog granularity" Glass will reflect more than the a black chess piece, unless it has a glossy surface. Just to detect an object digitally must account for variations in LED efficacy, aging and analog results of each sensor may vary 30%...
  17. Sunnysky

    Troubleshooting MH-Z14 CO2 Sensor Output Connected To Microcontroller - Sometimes readings go crazy

    the black area above U$5 in the layout,,which I thought was the sensor , but now I see it is U$3 not on board. So where is it located? I assume the 0-2.5V analog out matches the PWM.
  18. Sunnysky

    Troubleshooting MH-Z14 CO2 Sensor Output Connected To Microcontroller - Sometimes readings go crazy

    is the sensor physically isolated from any other sensor, equipment except scope , affected by ceiling lights? stable in a sealed box? In other words can you alter the PWM effects ,,worse or better in any environmental way besides breathing on it. I am curious about the stray capacitance in...
  19. Sunnysky

    Can you identify this lifeform?

    Is it a sonic LED light pipe MIDI colour organ synth? aka the sonic manipulator
  20. Sunnysky

    Troubleshooting MH-Z14 CO2 Sensor Output Connected To Microcontroller - Sometimes readings go crazy

    If those two supplies don't change the results then it is not conducted noise. They should. Yes caps on each sensor near pins. 1uF//0.1uF How long are the wires for DC? Have you tried to monitor current consumption for correlation? Calibrate ADC for long term stability. I read the manual...
Top