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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by ThomsCircuit

  1. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    It works great. Pot set at 25K. Thank you Galgso. PCB Solar Controller BB LED Strip 39"
  2. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    So cool that I got it right! I will BB this and test tonight. Thank you so very much for your help with this.
  3. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    This is my assumption
  4. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    I can do both but I'll focus on the Darlington pair with the (2) 2907's First let me know if i interpreted your diagram correctly then second where do i connect the LED? And finally, where does the LRD fit in
  5. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    Alright. This correct? The LED Strip does not need a current limiting resistor so I removed it.
  6. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    I do not have an LM358 but I do have a LM311. This group helped me design a Dusk to Dawn sensor a few years back but it was designed for 12 volts and used a relay. If it is easier perhaps we could alter this schematic to run on 3.7 volts and not use a relay.
  7. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    I made a mistake documenting the example. This is the correct sample. (Left) I also tried to interpret your sample. (Right) It did not work but im sure I mis-understood it. If you could use what I have done and tell me what I did wrong.
  8. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    I believe I solved this. I traded out the NPN for a PNP. I had read that it may work better but could not find an example. Regardless, I found an example that uses a 2907. It make not be the most efficient, If you have and suggestions as i would like the circuit to be fully on or fully off. The...
  9. ThomsCircuit

    Solar charged 3.7V battery. LDR circuit to drive 300ma

    This sample circuit uses an LDR to switch on a single LED with a 547 NPN. Could you assist me in updating this so it will drive a small strip of LED lights. They draw a little less than 300ma. I have some larger transistors and mosfets. The circuit runs off a 3.7v Li-ion battery that is charged...
  10. ThomsCircuit

    30ma SMD LED Resistor

    You have all been so helpful. Many of you also helped me discuss and improve this buck converter. Three years ago. It started with replacing the tiny SMD pot and led to a full project. I learned a lot doing this project. But that's why I decided to build it. It has been a good learning experience.
  11. ThomsCircuit

    30ma SMD LED Resistor

    Yes, I sucked up the little solder there was then carefully disconnected the LED. It took me about 10 minutes. Most of that time was trying to align and solder on the new one.
  12. ThomsCircuit

    Good Eats

    I found myself with more spinach than I could consume so I made these. They were fabulous. Spinach Pesto: 2 1/2 cups fresh baby spinach 3 garlic cloves 1 tablespoon olive oil 2 ounces feta cheese, crumbled Meatballs: 1 pound lean ground chicken 2 ounces feta cheese, crumbled, 1 large egg...
  13. ThomsCircuit

    30ma SMD LED Resistor

    Yep. The light is way to bright. Its more like a flashlight.
  14. ThomsCircuit

    30ma SMD LED Resistor

    You are the smartest! I was misinterpreting the arrow on the bottom of the component.
  15. ThomsCircuit

    30ma SMD LED Resistor

    Oh my gosh! The LED was backwards. :banghead::banghead::banghead:
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