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  1. Sunnysky

    Need circuit for one or two IR led illuminator

    Without datasheets or partial schematic of Before and addon, with available power source or some Measureable specs on desired changes, I have no idea what you want
  2. Sunnysky

    Led driver of constant current - is it really constant ?

    Constant Current source using 200nA diode @ 376mV from Vbe=Vce driving an open-collector Comparator with an 18 Ohm Current sensor for 20mA = 376mV/18Ω . Unregulated R limited LED compared on the right runs from 28 to 12 mA while Vbat ranges from 3.2 to 2.2V... My Simulation here...
  3. Sunnysky

    The corona. What's the latest?

    Yet the author has decades of experience in the virology field https://scholar.google.ca/scholar?start=10&q=Beda+M+Stadler&hl=en&as_sdt=0,5&as_vis=1 So opinion based on scientific experience is stronger than faith. The best truism is how strong we enable our bodies thru nutrition, exercise...
  4. Sunnysky

    Electronics Mortuary

    All fuming plastics are carcinogenic and the melting PVC power cables at 3 Mile Island were probably more toxic than the radiation at that time. Inhalation of any qty is not advised.
  5. Sunnysky

    Can Anyone Identify This Component?

    If it has a Triac and a 2 legged active part, it must be a DIAC
  6. Sunnysky

    Help me please to get a good night's sleep!

    also consider a Chinese Dr (TCM) and get acupuncture and herbs for extracted strong medicine tea and join a community of similars. Get educated on the causes and treatments. read research , see Dr. https://www.cpap.com/blog/cpap-pressure-setting-cpap-apap-bipap/
  7. Sunnysky

    SEARCHING SA8X18N PLL DATASHEET

    If you are willing to learn how a modern PLL synth works, maybe https://www.cypress.com/file/137666/download
  8. Sunnysky

    SEARCHING SA8X18N PLL DATASHEET

    No chance of substitute and expensive to replace.
  9. Sunnysky

    LED Display (Home project)

    Yes Harold, however I doubt anyone with my experience would agree with your assumption that there is any valid solution to the objective of this OP and thus my answer. All professional design Engineers have make/buy decisions on every component on every design. . This is not a valid newbie...
  10. Sunnysky

    LED Display (Home project)

    Like any other LED Raster Panel displays, it is cheaper to buy than make with no skills or complete design..
  11. Sunnysky

    Class AB Power Amplifier Design

  12. Sunnysky

    Snubber cap and R

    If you examine my bottom two traces, the noise around the triac and the noise generated on the grid can be easily simulated with a loop of wire and a small relay coil with 50% V to the coil in series with the NC contacts. THis will radiate enough noise to see if your breadboard or protoboard...
  13. Sunnysky

    Snubber cap and R

    I love Falstad's ability to use your imagination. If you can scheme , you can simulate it. Actually, your RC snubber looks best for EMI and OVP except you draw twice the power. No big deal. TVS is good for Triac protection and faster actuator release (Tau) but that also generates EMI...
  14. Sunnysky

    Snubber cap and R

    I agree with the TVS as this quickly discharges the energy with high V, low current. But watch out for parasitic inductance in the loop with TVS. I recommend the Snubberless Alternistors. 600V or 800V...
  15. Sunnysky

    Frankenstein's Components.

    I used to be Test Engineering Mgr at the Burroughs/Sperry/Memorex/Unisys Peripherals plant in Winnipeg starting '83 where we refurbished those old 14" drives. Some of the baseplates worked well for a Hibachi BBQ The 207 model had a 1 HP+ (?) linear motor that was the fastest servo at its time...
  16. Sunnysky

    Frankenstein's Components.

    Visited Jamaica at a friends house who's neighbour across the back lane had a few roosters. I figured out how to silence him for brief spells. Play back his recording on an iPad just before he starts to crow. just for laffs.
  17. Sunnysky

    3 Switches circuit

    THe first step is to define the logic for each of 3 switch logic OFF transitions to check which if any needs to be turned on. This needs a binary count of the current state of how many are ON and which are off then a logical function to set the output of any output. Also an intial condition...
  18. Sunnysky

    Questions about chargers & charging a 2kWh section of a Chevrolet Volt battery

    The NTC is also called an Inrush Current Limiter ICL. To reduce stress on Caps, I suggest you order a few replacements.
  19. Sunnysky

    Frankenstein's Components.

    In the mid 80's I spent 500 bucks on a "mineral THerapy lamp" that looked like it cost 20 bucks to make but the Hollistic convention salesman Dr Li showed me the photographs of healing just about anything, THe japanese call it FIR therapy which is the same and means far Infrared known for having...
  20. Sunnysky

    1980 Soviet Radio Cassette amplifier problem.

    The pre-amps for each audio source ( incl cassette ) need to standardize and normalize the gain to produce 1V ( either rms or pp) to the source button selection so that the audio levels are uniform. It "sounds" like your power amp gain is too high and cassette pre-amp gain is too low or the...
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