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.
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.
OOOOOPs. I made a giant mistake. Yes, I'm embarrassed. My digital voltmeter had a blown fuse and I did not figure it out until this morning. When I replace the fuse, all seems ok. But the question of how to weather proof them seems vague. I read a lot of for sale info on different panels and...
What weather protection is needed for a solar panel? I mounted a 12" X 12" panel in a wooden frame. It worked fine for about 6 months, but now it only output in full sun about 17 volts and less than 3 ma. I assume weather did something. The panel had no extra material on the back side.
I apologize for my incorrect statements, but I ask questions to learn a little. The little amp I built does a great job even if I don't have a clue about the correct power output. Besides a great deal of enjoyment listening to music, I am learning a little something about how to use solar to...
The 2 watt amplifier is a kit fro Carl's. I did not use the jumpers for a gain of 20 to 200(26 to 46 db). I don't really have a clue, but I didn't need the jumpers for a good sould. It is a kii5, and uses 2 LM386N. I am using 2 small, salvage speaker from a broken cd player. I used the 9 volt...
"The voltage from the solar panel needs to be between 3.2V to 4.2V greater than the charged battery voltage."
I use a LM317 set @13.8 volts into a 12 volt sla. If the sky is cloudy and voltage low, does the lm317 drain the battery? I have a diode at the solar panel.
Regarding my questions...
I'd like some comments on the item below. Any comments are welcome and appreciated.
I built a very simple battery charger using an lm317, resister and diode. The input is a solar panel that typically is outputting about 15+/- volts and 100 to 200 ma. The battery charger is connected to 4...
Ok, here is my quest. (I am not very knowleagble on electronics, just retired). I bought a Sony ICF SW7600 in Colombia in 1992. Last year, it would not receive anything. I read about the crummy elect. caps that sony used so I bought enough of the small smd devices I needed to get a replacement...
I'm slow on a lot of things, but a light bulb just went on. I read:
Make a regulator with an output voltage of 13.8V for the batteries plus 0.7V for isolation diodes= 14.5V total. An LM317 adjustable regulator set to 14.5V with two resistors and two capacitors can be used. It will need a medium...
I just salvaged my Sony sw7600 radio by replacing all the surface mount elect. caps. I didn't expect it to ever work again. It was like trying to solder a pill bugs on the board. I used magnification-- a must for older eyes. The radio didn't work at first, but upon a close look a small piece of...
I bought a nice and very inexpensive little fm radio. I built a case for it and have power input terminals on the outside of the case. I put a 5 volt voltage regulator chip inside the case to allow correct voltage fed into radio using various feed power sources such as a solar panel, battery...
I make with some simple circuits. I have a lot of questions on this hobby. I want to build a 10 led voltage indicating circuit for 5 to 15 volts, d.c. Bought several lm3915. Will the lm3915 work or do I need the lm3914? I would like the results to be 1.0 volt per led. Thank you for any help.
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