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  1. D

    problem with 48vdc motor destroys relay

    What have you been using for diode, part number ? Diode fail short or open or ....? You using a snubber as well ? https://www.cde.com/resources/technical-papers/design.pdf https://assets.nexperia.com/documents/application-note/AN11160.pdf Regards, Dana.
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    Snubber circuit

    Try this - https://www.google.com/search?q=snubber+design&rlz=1C1CHBF_enUS999US999&oq=snubber+design&aqs=chrome..69i57.4640j0j7&sourceid=chrome&ie=UTF-8 Regards, Dana.
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    Searching for suitable opamp for VLC project

    https://www.analog.com/en/product-category/optical-transimpedance-amplifiers.html https://www.analog.com/en/technical-articles/stabilize-transimpedance-amplifier-circuit-design.html...
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    need guidance making a voltage regulator

    Sorry for not speaking your language, but todays technology, phone translators and AI based interpreters, Google translate, getting pretty good. Regards, Dana. PS : My native, English, major challenge for me.
  5. D

    Project help request: Striking a bell manually, alarm clock.

    What are you asking ? If you are using ESP32 you will not need Arduino board.... Regards, Dana.
  6. D

    need guidance making a voltage regulator

    No on reversing. Go to page 31 and it talks about min/max usage and why a min or max is used in the calculations. Regards, Dana.
  7. D

    need guidance making a voltage regulator

    Zener Diode regulator, take a look at : Zener Diode Calculator calculators, engineering calculators.... www.calculatoredge.com or https://www.electricaltechnology.org/2014/03/zener-diode-voltage-regulator-calculator.html or https://www.petervis.com/electronics...
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    need guidance making a voltage regulator

    A post I posted on wrong thread, could not find erase button. Regards, Dana.
  9. D

    Voltage limiter 9V and above

    @crutschow, I played with sim, values, etc., seems totally stable. Note a load step is invoked at 2 mS of ~ .5A I can see now how 150K essentially stops loop closure effectively. Regards, Dana.
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    need guidance making a voltage regulator

    1
  11. D

    Voltage limiter 9V and above

    I was looking at original OP posted schematic, now I see yours has a control loop 180 thru MOSFET, MOSFET C loading Vout pin of 431, then back thru load and its C (if any) and MOSFET Rds and then R4. Maybe a transient sim as well as a bench test ? Regards, Dana.
  12. D

    Voltage limiter 9V and above

    This seems to imply there is in fact feedback in that circuit : Some simple bench testing should show phase margin problems from transient response, if there is a problem. Regards, Dana.
  13. D

    Voltage limiter 9V and above

    There is always a comparator with reference as a possibility : https://www.digikey.com/en/products/filter/comparators/692?s=N4IgjCBcpgHAzFUBjKAzAhgGwM4FMAaEAeygG0QAWAJjAHYBWCAXSIAcAXKEAZQ4CcAlgDsA5iAC%2BEotXIhkxALZsM-DB2L8QzCUA Regards. Dana.
  14. D

    Voltage limiter 9V and above

    Caution about C loading of this part and its stability : Regards, Dana.
  15. D

    How can I find out the original model number by marking code and top mark?

    Silicon7 logo ? https://rtellason.com/semiconductorlogos.html Regards, Dana.
  16. D

    DC 12 V to AC 220 V

    You will have to perform a non linear analysis. IEEE has a book and a number of papers in this area. Regards, Dana.
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    Confused about tuned oscillator behavior.

    https://www.zeitnitz.eu/scope_en https://www.roomeqwizard.com/ https://www.instructables.com/PC-SOUND-CARD-SCOPE-INTERFACE-FACILITATES-DC-RESTO/ https://www.daqarta.com/dw_0all.htm The above a sound card oscilloscope. Good to ~ 20 Khz. Make sure you protect your sound card inputs, google...
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    SI4703 Radio Project

    The doc you supplied shows using Arduino boards. Arduino is modified C / C++. Does this mean you are to use IDE from Atmel to do the coding ? https://www.microchip.com/en-us/tools-resources/develop/microchip-studio...
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    LC oscillator and resonance frequency

    @takotak I am a EE, and a wannabe but not capable or competent physicist. Looking for critical comment on my understanding. I used to think of current flow as an e- moving from A thru a loop of conductivity back to A. Now I think its an e- in a statistical state, moving from an outer valence...
  20. D

    Basic transistor switch

    There should be a thumbs down and a thumbs intermediate button. Dont have to stare at happy face trying to figure out what nuance is this...... Facebook a 100+ faces, so like to spend minutes trying to find the face and its definition....at least now Facebook defines the face meaning...
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