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  1. scwhiteley1

    Solar charging a small SLA

    Hello guys and gals, I've started figuring and ordering parts for yet another portable stereo project and could use a little input. For this stereo, I'd like to use solar panels to provide charge for the battery pack. It should be mentioned that the solar panels will not be the only source of...
  2. scwhiteley1

    Eliminating Battery Charger Noise on DIY Stereo

    Hey, I'm currently working on a DIY stereo that will be powered by a 14.4V NiMH battery pack. I've already built a previous stereo with a similar design and the same style of battery pack, which I recharge with a "smart charger" I purchased online. My problem is this: If I turn on the stereo...
  3. scwhiteley1

    Charging 12V SLA with bike dynamo / generator

    Hello, I've found a number of posts regarding this (or related) topics, but I still have a few questions. This project is part a bigger project that involves a bicycle stereo powered by a 12V 1.2Ah battery. The current setup requires a wall charger to recharge the battery, but I'm looking into...
  4. scwhiteley1

    TDA7240 distortion at low volumes

    Howdy, I recently built a few amps using TDA7240 ICs. I used the circuit design from the spec sheet. They seem to work pretty well, but for some reason, when set to a very low volume, there is an audible "scratchiness" to the music. Any ideas what would cause this? I did not use shielded wires...
  5. scwhiteley1

    LED VU meter question

    Hello! I just ordered a few LM3916 IC's that I intend to use to build a LED audio meter. My plan is to connect it to a stereo I've built using TDA7240 amp IC's (20W). My approach is pretty straight forward, I'm planning to use the typical application schematic out of the spec sheet, which you...
  6. scwhiteley1

    Battery Pack Burnout

    Hello! I recently built a portable stereo that runs off a battery pack consisting of twelve AA size NiMH batteries (14.4V) It has worked like a dream, that is, until today. The stereo worked this morning, then as of this afternoon, it did not. I opened it up to see what was causing the...
  7. scwhiteley1

    Portable Stereo Project: Amp Woes

    Hello! I'm working on a portable stereo project and could use a little input. I've built a few stereos over the past couple of years with varying success. So far I've only used TDA2003 and TDA2030 IC's in my projects, but I'm open to suggestions. Here are some of the hardware parameters of the...
  8. scwhiteley1

    A battery of batteries... good idea or bad?

    Hello! I'm working on another portable stereo project and am bouncing a few ideas around about the power supply. The stereo I've been using for the past year or so is powered by twelve NiMH D cells (which power two 20 watt amps.) This is is fine, but it makes it big, heavy, and is a pain to...
  9. scwhiteley1

    Simple, in-line volume control

    This seems like a simple question with a simple solution. However, as usual, the more research I do, the more confused I become. I've built a few simple amps in the past using simple IC's and other people's schematics. So far I've had pretty good results. Currently, I'm building a simple stereo...
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