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  1. bertus

    Solar charging a LiFePO4 Battery (advice welcome!)

    Old thread, locked.
  2. bertus

    Solar charging a LiFePO4 Battery #2

    Hello, No, the origenal thread is here: https://www.electronics-lab.com/forums/threads/solar-charging-a-lifepo4-battery-advice-welcome.283893 I moved the necropost from that thread. The thread was 6 years old. Bertus
  3. bertus

    The official Xmas/holiday thread 2025

    Happy new year from amsterdam:
  4. bertus

    Distinguish FET from BJT from ? with DMM

    Hello, Here is a larger list for n3; https://smd.yooneed.one/code4e33.html Bertus
  5. bertus

    Distinguish FET from BJT from ? with DMM

    Hello, You can not measure the part incircuit. There will be surrounding parts that will influence the measurement. Here is a list of possible parts for smd code n3: https://www.s-manuals.com/smd/n3 The size of the part may narrow the search: Bertus
  6. bertus

    Comedy Thread

  7. bertus

    Comedy Thread

  8. bertus

    Comedy Thread

    Let's adjust our expectations:
  9. bertus

    IR Spectrometer Project: Is This Project Within My Reach?

    Hello, What kind of spectrometer do you want to make? There are absorbtion and reflection types. Bertus
  10. bertus

    IR Spectrometer Project: Is This Project Within My Reach?

    Hello, Have a look at the following pages about ir ranges: https://nlir.com/understanding-infrared-spectrum-frequencies/ https://www.sciencedirect.com/topics/physics-and-astronomy/infrared-spectrum Wich specific range are you looking for? What do you want to measure? Bertus
  11. bertus

    LED bulb+base combo

    Hello, Perhaps a G9 based led:https://grandbrass.com/2-watt-t4-led-clear-finish-g9-base-5000k-120-volt/?srsltid=AfmBOoodN6JSVls-Ngz-JLoaXhhJdyk6v127vgHCHRyeXO3miuemM_4u Bertus
  12. bertus

    LED bulb+base combo

    Hello, Would this kind of battery powered leds work? https://www.amazon.com/SUZEYAR-Miniature-Battery-Dollhouse-Building/dp/B0D4Y773CZ?th=1&psc=1 Bertus
  13. bertus

    LED bulb+base combo

    Hello, You could use a gu10 bulb. https://www.any-lamp.com/led-lights/led-spotlight-bulbs/gu10-led-bulbs These spotlights come with different light angles. Bertus
  14. bertus

    3296W series multiturn trimpot

    Hello, Find the datasheet of the relays and look if they mention the diode. It will not hurt to have an external diode. Bertus
  15. bertus

    3296W series multiturn trimpot

    Hello, Yes, that is correct. The led will go on when the input is 3 Volts, together with the relays. Bertus
  16. bertus

    3296W series multiturn trimpot

    Hello, I have shown your schematic full size. In the top schematic, the led will not light as the voltage is limited by the base-emittor of the transistor. In the bottem schematic, the led will burn as there is no current limiting. Bertux
  17. bertus

    3296W series multiturn trimpot

    Hello, Can you post a schematic? The voltage drop of a led depends on the color. Bertus
  18. bertus

    3296W series multiturn trimpot

    Hello, Yes, the base resistor would be (3 - 0.7) Volt / 0.00167 A = 1377 Ohm. ( the 0.7 Volts is the base-emmitor voltage) You can try 1200 or 1500 Ohms as base resistor. Bertus
  19. bertus

    3296W series multiturn trimpot

    Hello, You do not need a trimmerpot. For switching applications there is a rule of thumb. The base current should be 1/10 of the collector current. Bertus
  20. bertus

    Comedy Thread

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