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  1. HarryA1

    power circuit

    VARIAC
  2. HarryA1

    change ps 613u pots

    Multi-turn pots makes it slow to make adjustments. As Vellerman did not use them perhaps you could replace the pots with good ones like Allen-Bradley pots. Beware  of the various tapers that pots have.  Check Ebay for good prices on Allen-Bradley pots from US suppliers.
  3. HarryA1

    arduino atmega 328p on breadboard

    Are you using the information from Jaycar site? There is lot of information on their web site in   Specifications and Articles. https://www.jaycar.com.au/atmega328p-mcu-ic-with-arduino-uno-bootloader-and-16mhz-crystal/p/ZZ8727 The manual is here...
  4. HarryA1

    What are some of the best solar energy products that I can buy?

    Forums like this one would be more useful for your questions. They have folks there that have a lot of combined experience. https://www.solarpaneltalk.com/
  5. HarryA1

    Fridge Protection

    What code book? And why do you care? Unplug the refrigerator and plug it into one of these. https://www.ebay.com/itm/293616232230?_trkparms=amclksrc%3DITM%26aid%3D1110018%26algo%3DHOMESPLICE.COMPLISTINGS%d%3APL_CLK|clp%3A2047675
  6. HarryA1

    Watch out for electronic component scams!

    As this was in response to a previous post that was removed I will replace with a joke: Wife texts husband on a cold winter morning: "Windows frozen, won't open "Husband texts back: "Gently pour some hot water over it and then gently tap edges with hammer." Wife texts back 10 minutes later...
  7. HarryA1

    For sale 5.75$ power supply.

    I would think these 5 volt and 5 or 8 ampere power supplies would be useful for micro-controllers, etc. https://www.sciplus.com/8a-5vdc-power-supply-65520-p
  8. HarryA1

    DC Timer

    If you are handy with a soldering iron you can get a push button switch with potentiometer on ebay.  for example: https://www.ebay.com/itm/113927101102?hash=item1a86959aae:g:TyAAAOSw6ShdqKXJ&amdata=enc%3AAQAHAAAAsCTccvK8zt8P7ay7xO2JNnQVqK54hb11np% You would need to match the potentiometer...
  9. HarryA1

    Oscilloscopio Tektronix TDS460

    "Search for the power board for a Tektronix oscilloscope mod. TDS460. The P/N is PS1690 rev.A" In the future you may use https://translate.google.com/ There are a number of boards on ebay.com for the TDS460. You will have to scroll down to find them. See...
  10. HarryA1

    BGA rework Process?

    Is Rolling Meadows, IL 60008  near you? see: https://www.solder.net/training-courses/bga-rework-training/ See for low key diy rework: https://www.instructables.com/BGA-rework/
  11. HarryA1

    I just do a design of lm386-based audio amplifier circuit

    You need to supply a link/url to the DXP software you are using. There are numerous software packages called DXP.
  12. HarryA1

    Doubt Chemistry CR2032 battery

    see: https://en.wikipedia.org/wiki/Button_cell  for  chemical composition of the CR2032 cell. The C tells you it is Lithium and Manganse Dioxide.
  13. HarryA1

    Doubt Chemistry CR2032 battery

    You have been well answered on the numerous forums you have posted this question on. I do not see anyway to post links now - Admin got sick of having to delete them?
  14. HarryA1

    Using capacitors instead of batteries

    I would think you would not need a converter given: "Discharge current is software and electronically regulated using a solid state switch and fan cooled electronic load" Why can't you  get the energy/power by simply charging a capacitor over some time interval?  Given work W = 1/2*C*V*V  in...
  15. HarryA1

    Using capacitors instead of batteries

    I would think shorting the output would kill the converter thus acting as a smokey fuse.  The solar power folks use converters that supply a constant output for varying input  voltages. One would like a converter that supplies say 5v as the capacitor discharges from say 12v to 7v. Perhaps this...
  16. HarryA1

    Using a buck-boost converter

    Try measuring the input resistance at the +Vin and -Vin. On the up/down converters I have they  measure 400k to 2meg ohms. Perhaps comparing the two would be helpful. One has to expect failures from these inexpensive  Chinese modules.       
  17. HarryA1

    Using capacitors instead of batteries

    Perhaps one could use a dc to dc converter without loading the capacitor, thus not discharging it quickly? They made various types for various voltage combinations. See for example:  https://www.amazon.com/Aceirmc-Current-Converter-Adjustable-Regulator/dp/B082XQC2DS among many. This subject...
  18. HarryA1

    Any one has the TNETV1051EACLZDW datasheet?

    Yes they hide it well! Try: https://www.sierraic.com//buy_online/datasheet/TNETV1051EA or Ti directly.  Good luck.
  19. HarryA1

    PTC resettable Fuses problem

    Sorry they are beyond me. Why would one use a 3 amp fuse that trips at 6 amps? What does the 15 and 50 amps got to do with it? How would it allow current that high? Beware there are a lot of fake components out there. I got some ICs via  Amazon.com lately they had the TI symbol on them but also...
  20. HarryA1

    PTC resettable Fuses problem

     Time plays a big factor with PTCs; 26. Recovery time: The recovery time after PTC thermistor action should not exceed 60S. see: https://www.ntcsensors.com/Technical_parameters_of_PTC_resettable_fuse/#:~:text=Under limited conditions%2C the highest voltage that the,may be broken down and...
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