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  1. abador1

    tda7297 pulsing output

    This is the link; http://www.amazon.com/gp/product/B00K67WI9I/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 It was a cheep one from china so I wouldn't be surprised if there was something wrong with it. The pulsation is in the form of a buzz in the speakers, it won't play music. The speakers...
  2. 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...
  3. abador1

    cyberpower 375SL service manual?

    I cracked the unit open and checked the voltage at the battery with the unit unplugged and then with it plugged in. Unplugged it reads under a volt but when it is plugged in the circuit reads 13 volts. I figure this means the charging circuit must be good but the battery is bad. The battery is a...
  4. 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...
  5. abador1

    Looking to buy pre etched pcb

    Hey Hero999, I like your idea. I actually found a module that was about $10 so I decided that one might be better quality so I think I might get that one. I have all the parts in case any of the parts go bad. I'll have to research how to troubleshoot if it doesn't work but I'll tackle that if...
  6. 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...
  7. abador1

    IC doesn't fit in pcb

    I attached a schematic. I have looked at other schematics for amplifiers and it has shown the volume being ether on the input or on the main power input. Since the chip has two input pins I don't know how well it would work. I could put the pot in the main power input but my pot is only rated...
  8. abador1

    IC doesn't fit in pcb

    Where would I put the volume pot?
  9. abador1

    IC doesn't fit in pcb

    It is too small. It is a TDA7297 chip. I'm trying to fit it into a general pcb that would probably fit into a bread board. It doed have two rows. it stands upright as apposed to laying against on the board.
  10. 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?
  11. 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...
  12. abador1

    Building an amplifier

    Also I just looked at the amp on newark and the page with the item says they charge a $20 freight charge per order. Is that something I would have to pay or is it some kind of complicated thing that I don't understand?
  13. abador1

    Building an amplifier

    I got my old account back so this is abador08. I'm not going to use abador08 anymore and am going to keep this as my primary account. I looked up the data sheet but it's a little difficult for me to figure out the schematic. I think the box in the middle must be the ic because the pins are...
  14. 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...
  15. 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...
  16. abador1

    Electronic suppliers

    As far as jumper wire go, I have had very good experience using telephone wire, just make sure that is is not stranded wire. When using the wire as jumpers the wire goes a long way and is not very expensive. There are several wires in there and you don't need much wire. I was able to pick up...
  17. abador1

    DC Potentiometer in AC circuit to control DC output.

    Thanks for all the replies everyone. I ended up putting the potentiometer in the DC part of the circuit and in series with the load. I still don't know why the readings I kept getting were so unpredictable, all I can think of is that maybe it's the fact that my multimeter only cost me $12. I put...
  18. abador1

    DC Potentiometer in AC circuit to control DC output.

    I probably should have labeled the out terminals in the schematic instead of labeling the resistor as load. Basically I'm just trying to use the LED as an indicator that it is working right/is on. The "load" is actually just supposed to simulate a load that could have been used on the output. I...
  19. abador1

    DC Potentiometer in AC circuit to control DC output.

    I actually have a rectifier that is in one unit so I guess I drew the rectifier wrong, sorry about that. I ended up removing the potentiometer from the AC part of the circuit and put it in the DC in series with the output. I have still had trouble with the power supply though. I changed out the...
  20. abador1

    DC Potentiometer in AC circuit to control DC output.

    Ok, I got it. Sorry it's a little messy. I tried cleaning it up but the simulation software I was using wouldn't let me take off some labels, the blued box at the bottom was only a command for the program. Basically the fuse is on one side of the circuit and the potentiometer is on the other...
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