Search results

  1. RDL2004

    Simple dB meter driver circuit.

    Maybe this will be of help: http://sound.westhost.com/project55.htm Analog meters have not totally disappeared, for example: http://www.mcintoshlabs.com/mcprod/shopdisplayproducts.asp?hid=1&id=14&cat=Power+Amplifiers&prodid=1028&product=MC602
  2. RDL2004

    Converter LED to LCD

    Remember that LEDs are Light Emitting Diodes, they can only be seen by the light they give off. LCDs are Liquid Crystal Displays, they do not give off light on their own and can only be seen by the light that shines on them or through tham. The back-lit LCD screens on computers and TVs are...
  3. RDL2004

    Power supply for amps

    Before you go spending a lot of money, you might want to spend a few days reading posts here: http://www.diyaudio.com/forums/ Check out the Chip Amps forum in particular.
  4. RDL2004

    Projection clock

    That is an excellent project. Well hacked.
  5. RDL2004

    Home-made bench power supply voltage drift problem question.

    I built my own bench power supply last winter/spring. It is a variable voltage supply using a circuit from one of the National Semiconductor datasheets using an LM350T regulator. It works pretty good, except when first turned on the voltage will not be what it was when it was turned off. This...
  6. RDL2004

    Tssop package -> DIP

    I'm pretty sure those are the BGA type (Ball Grid Array), I don't see any way you could solder those by hand (at least not realistically). Reflow solder would be my guess as to how those must be soldered (though I am not an expert on that method or BGA chips).
  7. RDL2004

    Tssop package -> DIP

    SOP = Squint Only Periodically TSSOP = Terribly Small, Soldering Operations Precarious QFN = Quite Frustrating Now TQFP = Terrible Quandary Finding Pins BGA = Better Get Aspirin SOT –23 = Somewhere On Table, 2 maybe 3 of them :)
  8. RDL2004

    Tssop package -> DIP

    http://www.capitaladvanced.com/products.htm
  9. RDL2004

    Tssop package -> DIP

    There is a product called "Surfboards" which are very small pc boards with pins along one edge and various multi purpose patterns etched on them. You solder your surface mount component to the Surfboard, then you can plug it into any standard type breadboard. These are not very expensive...
  10. RDL2004

    Can I run two regulator circuits off one transformer secondary?

    I put a fuse in the transformer's primary, but nowhere else. There is not much room for the manufacturer to have put a fuse in the meter, good idea though. meter When the wire came loose there were sparks and popping and clicking noises. The wire could easily have hit other places on the...
  11. RDL2004

    Can I run two regulator circuits off one transformer secondary?

    The meter won't blow if you short its supply? But I am pretty sure that is what happened. The negative power wire came loose and touched the positive connection. Meter will now only read -1 on display. Maybe it also touched something else or something else went wrong. Whatever, meter is now...
  12. RDL2004

    Can I run two regulator circuits off one transformer secondary?

    Yes, as I said in the original post, it would be two totally separate regulator circuits, by circuit I mean the whole thing, rectifier, filter caps etc., not just the regulator chip. Tonight I breadboarded up a 5 volt regulator circuit and connected to the transformer secondary of the variable...
  13. RDL2004

    Can I run two regulator circuits off one transformer secondary?

    The reason I want to try this is because I need to power a digital panel meter (19.99 volts) for my variable supply, it is a "common ground" type. It requires 5 volts, so I can't power it from the variable output of the supply because at times the output voltage could be too low to run the...
  14. RDL2004

    Can I run two regulator circuits off one transformer secondary?

    Is it possible to run two regulator circuits off of the same transformer secondary? One would be a LM317 and one would be a 7805 type. Everything about the regulator circuits would be separate,  from the rectifier diodes to the output. The only thing in common would be the secondary of the...
  15. RDL2004

    How to tell if an old electrolytic cap is good

    I was reading another thread where this subject came up. I was wondering what would be a good way to test if an old electrolytic capacitor was dried out or not? Maybe "dried out" is not the correct description, as I have heard of being able to "re-form" electrolytic capacitors I am...
Top