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About Sherldonnnn

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  1. This is a sharing of a portable speaker design project. Have you ever thought about designing and building your own portable speaker? A project like this is both easy and cheap if you source your parts wisely and have basic knowledge of electronics, soldering, and box construction. The first question you have to ask is, "What do you want this to do?" If you want 40 Hz bass extension, then you will have to design for it. If you want high SPL, again, you will have to select an amplifier and loudspeaker combination that can provide that. What did I want? I wanted a portable, battery-
  2. I was testing some things on my protoboard to learn a little about transistors. I made this: The batteries are two AA 1.5V in series. The resistor is a 1Kohm. The transistor in a TIP122(http://www.kynix.com/uploadfiles/pdf9675/TIP122.pdf) npn darlington. I uploaded a code that just put Pin9 as OUTPUT and HIGH, so I can test the currents on the circuit. 1.Current beetwen the Pin9 and the Resistor: 1,32mA. 2.Current beetwen the Baterry(+) and the Colector: 0,43A. 3.Current beetwen the Emissor and the Ground: 0,32A. I can`t understand this currents. I was expect
  3. Hi everyone !!!I'm starting to learn c lenguage for PIC and i would like to realize one dot matrix 8x8 display with an microcontroller someone can help me ? Which is the right step to introduce this particular range argument because i want focus my study for any particular argument so I can obtain more results with less difficulties.I don't know lenguage C for microcontroller in depth but i know any other similar lenguage like Java, Visual Basic and so ,now i'm studing one book that have this title "Pillole di MICROCONTROLLORI PIC " of Editor Company "INWARE" , you know ? Is 64 LED 8x8 module.
  4. Hi, I hope this is the right sub-forum. One of the SMD devices that I thought was just a PNP transistor for supplying 5v to LEDs turns out to be a BCR185W - PDF datasheet - which is a digital transistor. New to me. I wonder if anyone can explain things below to me in a way that my awkward brain can understand please? I did wonder why the faulty microcontroller on the control board had no resistor between its output pin and the base of the BCR185W and from what I can glean after reading a webpage all about understanding digital transistor datasheets (it helped a bit, but still don't u
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