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  1. abador1

    tda7297 pulsing output

    I plugged in my module that I got off of amazon with this chip installed. An onboard LED also flashes which goes to pin3 which should be the vcc. I am providing the circuit with the maximum 18 volts. Could the ic be bad or could I be overloading the internal overload protection somehow? I have...
  2. abador1

    cyberpower 375SL service manual?

    I bought this battery backup system from a thrift store for $4.99 hoping to have something that I can use to power some important items when the power goes out. once I got it home I charged the battery for more than the recommended 8 hours and the battery still does not kick in when I unplug the...
  3. abador1

    Looking to buy pre etched pcb

    I have been working on a project for a while but I have run into a roadblock. The generic perf board that I bought does not fit the ic. I have looked into etching my own pcb as well as designing my own and sending it to a manufacturer to etch it for me which I found to be way too expensive for...
  4. abador1

    IC doesn't fit in pcb

    I have an integrated circuit that doesn't fit in my pcb board that I bought. Will I break the IC if I bend the terminals? What are my options? Do I need to scrap the entire board since it won't accommodate my project?
  5. abador1

    Simple question about a schematic.

    I have a question about a schematic for the TDA7297 chip. In the schematic it shows a place in the upper right corner labled VCC and in the left corner it is labeled as VS. I have tried to research this and someone said that VSS tends to stand for a negative charge in the schematic but that...
  6. abador1

    Putting a light in my closet

    I want to put a light in my closet which is very dark. My biggest question at this time is where would I connect this circuit to mains power? I have an outlet right by the area that I would like to put the circuit so could I just attach the wires to the contacts on the outlet or would I need to...
  7. abador1

    Power supply is acting like a short but has high resistance

    I'm trying to get a power supply working that I recently have built but have been having constant trouble with it. The most recent problem is that the 3300 uF capacitor discharges instantly as soon as I unplug it from the wall, despite the fact that there is a 1K Ohm resistor and LED in parallel...
  8. abador1

    DC Potentiometer in AC circuit to control DC output.

    I finally finished a power supply last night after finally finding a working step down transformer. I put the 5K audio DC potentiometer in one of the AC legs from the transformer (series) and was amazed to find that I could get anywhere from about 18.6V to 3.6V. More recently I tried to charge a...
  9. abador1

    120V shorted out, why did the lights get brighter?

    I must have been tired and wasn't thinking at the time but I thought I'd try to make the GFCI that I had plugged into the wall trip by shorting out the connections. I know it was dumb and quite dangerous but I have one big question that came to mind, when it was shorted out the lights went...
  10. abador1

    How to hook up a transformer

    Hey, I am trying to make a variable power supply and found that transformers are hard to find in working order when salvaging them. I finally found one that I think will work but the circuit that it was in was complex and even seemed to rectify the signal before sending it through the primary...
  11. abador1

    Where to find solder tips

    I have been looking for a solder tip but after buying one at radio shack then returning it because it was too big, stopping at two stores and calling a third one I have not found one that works. I would prefer to not pay a large shipping fee, one or two dollars at most but free shipping would be...
  12. abador1

    current spike

    I was trying to use LTSpice to design a circuit and it showed a spike at the transistor which was way above the power rating that I needed to accomplish. I added resistors at the base and the collector to try and limit this spike and ran another simulation of the wattage at the transistor and...
  13. abador1

    Good job!

    After reading some of the other threads I have compared the responses with the experience that I have had in my use of this site and I have not had much trouble at all with it. In the posts I have posted and viewed I have not seen any spam and I have not had any trouble with a virus threat...
  14. abador1

    Spice software recommendations?

    I want to download a spice simulation program but was wondering if anyone had any recommendations as to which they like to use. Also what are your thoughts on LTSpice? I have had someone recommend it but I would like to hear input from others on about it. Thanks.
  15. abador1

    Importance of resistor values

    Hey, I don't have a large variety of resistors so I have used what I have. I have a 10 ohm, 20 ohm, 33 ohm, 1 Kohm and a 10 Kohm. Is this a good starting point? How close should the resistor value be to the value stated in a schematic?
  16. abador1

    New member!

    Hey everyone, I am glad I found this community. I have been getting into electronics more recently and thought this would be a helpful addition to my research. I also thought it would be cool to be able to relate to others with similar interests on this topic. I am excited for this group.
  17. abador1

    Solar project in Peru

    Hey everyone, I am trying to plan a trip to Peru to install solar panels for a family down there. Their power is not very reliable so this would be a backup instead of using expensive gas to power their gas generator. I want to charge up a battery bank and then use the access to put back into...
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