Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Recent content by Johanx2

  1. J

    Can I replace a led for a solid state relay on a led vu meter?

    I see, after all I think I will use some IRF530, thanks.
  2. J

    Can I replace a led for a solid state relay on a led vu meter?

    Hi, does anybody know how sensitive are these little components (solid state relay)? I was thinking about if they can be triggered just by the small energy that a led vumeter circuit uses to turn on a regular led. I want to replace the leds for solid state relays instead, so I can switch much...
  3. J

    Using 2 potentiometer pins only for audio in?

    Hi, I have this doubt, what happen if I dont use the third pin of the potentiometer in an audio application? Its just a pin connected to ground, is it really necessary connecting it there? I need to do some potentiometer extensions, and if I can only use 2 pins, then I will use a minor number of...
  4. J

    How to desolder a potentiometer with solder in both board faces.

    I did it with a desoldering pump, but I did a dirty and difficult job, somebody told me to put an excess of solder that covers all pins, so now with all the pins hot at the time, all I need is to pull the piece and remove it once the solder is still very hot, I hope I knew this before doing...
  5. J

    How to desolder a potentiometer with solder in both board faces.

    Hi, few minutes ago, I tried to desolder a potentiometer of a double layer circuit board, I found that some pins are soldered in the surface, and I can not access that area because the potentiometer body are hidden them. So I only could use a copper mesh to remove the solder of the pins in one...
  6. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    As you can see here, I am taking this very seriously, will put some leds around the woofer, in the front, which will be commanded by the comparator connected to one the of the loudspeaker terminals, so there I avoid what you mentioned can happen, but I am still thinking about what Audioguru...
  7. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    Thanks betwixt, then I think I am simply going to connect it to one of the loudspeakers, which I believe that stereo sound, its not bridged. is not it? TPA3116
  8. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    You did not only remove that coupling capacitor, but only modified a resistor and pot value, reason? Also, is there a danger having that pot on a max or min ohm value setting? I supposed this is for gain, right? So I should start at max ohm value and adjusting the best setting for it. Thanks.
  9. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    Coming back to the simple vumeter comparator (LM311), so I should not connected to the amplifier output which is bridged (btl), unless I am using a separated power supply? Or should I connected to one of the loud speaker? this is something I did not understand at all. Some electronic parts have...
  10. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    I see, take a look at this: https://www.parts-express.com/dayton-audio-sd215a-88-8-dvc-subwoofer--295-484 This is 80w, and 31hz response, I needed something like this at first instance then, I was ignoring that factor since the beginning, price its similar to those cheap car audio subs.
  11. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    I have been comparing the specs of few 8" drivers on an enclosure calculator (I am understanding many things now), I found that there is not big difference in final enclosure hz with another brands with similar or a bit more price, like pyramid, pioneer, planet audio, I still have to try the...
  12. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    Thanks for the data, then this is good scenario to try the polyfill fiber and see what can it do. As I mentioned before, can I have read some users talking about it, and they said that it really made impressive improves lowering the frequency. This is going to be good experiment, I always...
  13. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    Well, I know that it won't be a stereo sound in all sense, but I think I am helping a little by doing this, imagine the waves that each loudspeaker spreads on its own angle, filling a room, it can be more notorious when getting some distance from enclosure, and even close, aside, anyway putting...
  14. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    Guys, I am moving soon, and wont complicate too much with the enclosure for now, so I think that the dedicated bass chamber of my enclosure, it's going to be sealed, 1 cubit feet for 8" driver, and filled it with one pound of poly-fill. Have you heard the miracles can do with sealed enclosures...
  15. J

    TIP31 feeding about 25 leds (audiorhytm circuit)

    Well, Helmholtz-Resonator calculator told me that can down A LOT the hz, to set the enclosure around 25 hz if I use that 3" pipe, 24" long, and keep the enclosure size about one cubic foot, I would put a little more space, about 1.5 3F, the thing is that, yeah, that pipe is very long. Do you...

Part and Inventory Search

Top