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  1. J

    PCB panelization

    See reply #6 above. In my experience, panelizing is handled at the fab-ordering level
  2. J

    RCA to HDMI

    Search for composite to hdmi converter and have a few twenties in your pocket
  3. J

    Miniture power supplies ?

    The 5-volt units are cheap and ubiquitous because cell phones are. There's only a tiny electrical difference between a 5- and 12-volt power-supply but (comparatively) no market for the 12's. That said: look here
  4. J

    working with tge Mx29gl512f flash memory chip

    The 'Read ID' and other non-memory operations are more complex than that: Notice how many operations must be performed to read the 'silicon ID.' That's three writes and one read( AA to 555, 55 to 2AA, 90 to 555, then ID from 000)
  5. J

    How to work with XC3S500E-4

    So you are using VHDL and xilinx: I'm Verilog and Altera- sorry. Somewhere in the Xilinx software there must be a setting similar to: "Infer multipliers"... search for that. There might be better places to ask this question, too. MAybe the Xilinx forums? Or here.
  6. J

    How to work with XC3S500E-4

    I meant that a programming language that targets this device will infer use of the multiplier-block. The example I gave was for Verilog. What language are you using?
  7. J

    How to work with XC3S500E-4

    Looks like it has them: how to use them depends on the language you use. I know that, in Altera Verilog, simply stating Word[35:0] <= Multiplier[17:0] * Multiplicand[17:0]; ... would do it.
  8. J

    2n3055 saturation

    That means: 'When the load requires 4 Amps DC, the voltage drop across the collector-emitter will be 1.1V maximum." Voltage drop will be at saturation: Vce can't get any lower for increase in Ibe at the given Ic. Whether the LM317 will be able drive it to saturation depends on the load: the...
  9. J

    I2C programming ?

    There are a few problems here. 1. The section of code "I2C_write()" is recursive, (calls itself) and that's not usually helpful. 2 "I2C_write()" also sends a parameter to a function that does not use one. 3. ... or maybe it does: there are no prototype-declarations shown 4 "I2C_read()" returns...
  10. J

    interesting thing about oscilloscope at different SEC/DIV

    The phenomenon involved is undersampling, also called aliasing... if you're lucky, you will only hear it explained a few dozen times in your life, so start now
  11. J

    New to Electronics: Is there any low voltage LED strip that can be powered with battery for Arduino

    The current-draw of a WS2812 is 20mA times the number of LEDs lit: you can change the number lit, but you can't change the 20mA.
  12. J

    74ls254

    What is a 74LS254? Can't find such.
  13. J

    How to Implement a USB or Bluetooth Interface

    Since you already have some Arduino experience and investment in this, consider using the Arduino Pro as a basis.... You needn't use a store-bought Arduino, just copy the circuitry that applies and buy an FTDI-based programmer
  14. J

    Wattmeter with analog output

    I believe that the wattmeter you referred to was the "Kill-A-Watt,' whose schematic(the input part, anyway) is internetly available. If you have a single-phase motor and if you attend to the isolation/safety issues, this device could be modified to what you need.
  15. J

    Audio matrix - one to many

    Don't think you're missing anything... Just send it an I2C transmission that names an Input channel, an Output channel, and maybe a Gain ( for 6430 or 6420) Repeat for every output you want turned on. It's really hell trying to find these things on the ST website... just found TEA6422, which...
  16. J

    Audio matrix - one to many

    It looks like a single I2C byte can specify a single one of five routed to a single one of four outputs If you need to have a single input routed to multiple outputs, you can do it with the TEA6420 The TEA6430 is the same device, but with a disable control. AND, to further the headachiness...
  17. J

    Audio matrix - one to many

    You're right.... that datasheet comes tantalizingly close to saying what you want, but doesn't actually say it . Take a look at the TEA6430 datasheet. It's almost the same thing, but with a bit more explanation. If it will do one-to-many switching ( which seems like its only reason to be) the...
  18. J

    Simple question? grouding starter relay using transistor?

    That sounds like (what has been in the past, too many times) an iffy wire connection. (Usually the starter ground.)
  19. J

    Random LED Colour Changer

    Mexico has a VAT. It seems to make more-expensive consumer goods worth smuggling.
  20. J

    Anyone know 220nF (400VAC) 7.5mm lead pitch capacitor?

    Look here
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