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  1. Sunnysky

    Converting LED to Street Light?

    FYI this is what it taKes to make a good street light. Each part serves a purpose. https://led-driver.power.com/design-support/reference-designs/design-examples/rdr-292-reference-design-report-150-w-llc-power/
  2. Sunnysky

    Momentary Toggle Switch - 5V Relay Board help!

    1-3 H typical coil test results and 75 Ω from specified L version (low power)
  3. Sunnysky

    Momentary Toggle Switch - 5V Relay Board help!

    Did you simulate relay as 1H and 75Ω?
  4. Sunnysky

    Momentary Toggle Switch - 5V Relay Board help!

    the Caps will see some negative V spikes that will should not exceed 10% of the forward V rating for long life on polarized caps.
  5. Sunnysky

    Seeking help on circuit design for LED rudder indicator

    I was thinking of dot mode with pin9 open. ty
  6. Sunnysky

    Drift issue in capacitance measurement, why?

    I am able to translate all of the ACT EVAL manual. The one you have now is obsolete and replaced with an improved one. In order to use this board properly, keep in mind the Cin limits on the board is very small such as 17 pF on yours with an offset range of 0.3pF and 150V/pF max sensitivity...
  7. Sunnysky

    Drift issue in capacitance measurement, why?

    Only if other EMC conditons do not exist or other factors. such as %RH or supply sensitivity or .... interface cables , inject noise into chamber or may act as bi-directional antenna with no choke or signal isolation to CM noise. Still waiting for value of Cfb to know how many milli/pico Amps...
  8. Sunnysky

    Experiment with finger vein scanner

    Do you know How to process image takes significant matrix multiplication for edge filter, pattern recognition for fiducials or bifurcation points and converting 3D object by light transmission to 2D array requires , more matrix math to align image for orientation error?? Then image gets reduced...
  9. Sunnysky

    Seeking help on circuit design for LED rudder indicator

    what is the purpose overall? mini-scale sailboat, real size, better feedback, resolution? remote control?
  10. Sunnysky

    Seeking help on circuit design for LED rudder indicator

    close... mult both R suggestions x10
  11. Sunnysky

    Drift issue in capacitance measurement, why?

    The noise and drift are separate issues unless there is large CM stray e-field getting rectified asymmetrically by the integrator. The drift may come from any source. You can start with a heat gun and cold spray to check for drift due to Input offset current sensitivity, which ought to be very...
  12. Sunnysky

    Drift issue in capacitance measurement, why?

    Normally the guard signal out from Op Amp are used to shield the input wires (common to both caps such as magnet wire twisted around each as a pair, unterminated.. This ought to reduce sensitivity to stray noise and stray capacitance changes Please Note this and scope the Op Amp output.
  13. Sunnysky

    How to control the speed of a 24vdc pump from circulating water temperature?

    Another option which makes it simple is a digital home thermostat with integral thermistor. then you control the motor PWM board with an on off relay between two speeds set by a pot and series R for continuous flow at slowest speed for off to reduce corrosion or boiling and highest necessary...
  14. Sunnysky

    How to control the speed of a 24vdc pump from circulating water temperature?

    No matter what thermistor you choose. the range may be 100 'C for 0-5V but you need a control range of 1% of this for comfort so an Op Amp with gain of 100x and offset control to set the temperature for regulation point. The best controllers have a PID loop to anticipate change (D) or...
  15. Sunnysky

    Momentary Toggle Switch - 5V Relay Board help!

    I wonder if contact bounce (5-10ms?) on input OR outputs will become and issue ... and what is the minimum On time, that is acceptible? 100ms? I think the XOR cct is correct solution with debounce cap >0.1uF across input switch. This will charge fast and hold on 1st contact and hold for ~22ms...
  16. Sunnysky

    Seeking help on circuit design for LED rudder indicator

    wouldn't U rather have a servo controller to set the rudder position like those used in RC hobbies.
  17. Sunnysky

    Solar cell charger

    dont use 7805, choose proper size PV array and voltage
  18. Sunnysky

    Solar cell charger

    Vbat charge =75% Voc from PV ( open cct) is near ideal +5% for bright and -5% for dim If the array is small on a cloudy day then you need large mirrors to reflect more sky diffused energy to PV for slight improvement, otherwise SOL. The phone will regulate the voltage if impedance of PV s low...
  19. Sunnysky

    AMP connector identification

    Yes , experience helps. My method is get familiar and search by category see my prev entry,,starting from Index to housings sunnySKY
  20. Sunnysky

    AMP connector identification

    found it Product Index > Connectors, Interconnects > Rectangular Connectors - Housings > TE-Connectivity-AMP-Connectors 2-179958-2 http://www.digikey.com/product-detail/en/te-connectivity-amp-connectors/2-179958-2/A29583-ND/664333 with more digging, you can find the mate, contacts and...
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