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  1. Jouellet

    mv to ma current amplifier design

    for instrument amplifier, I normally use the INA125AP . Extremely easy to use for the 4-20 transmitter, try one of these: AD694, XTR101AP, XTR105AP, XTR112AP, XTR112AP, 2 ICs and a handfull of resistors/capacitors will do it ....
  2. Jouellet

    Help me identifying the multiple leads coming off this pcb

    you may want to retake the back picture, as we can't see much !
  3. Jouellet

    Making PCBS

    If I need quantity, I use China as well When prototyping/designing I make them myself: When the schematic is done, I have a board made/drilled in less than 2 hours... Your chinese dude can't beat that... Period ! I don't know how you used to make your boards, but mine are nothing to be ashamed...
  4. Jouellet

    Making PCBS

    Alec: depending of the size of the board to make, you may be able to print twice on the same page.. I do print them on 2 pages and put them one on top of the other (and scotch them) As for being worried or not and the messy etchant, just do it once on the kitchen counter top, when your wife is...
  5. Jouellet

    Simple Circuit sound board recording project to build from scratch

    check this site: http://www.electronics123.com/shop they might have what you're looking for...
  6. Jouellet

    Looking for a way to remotely open/close a circut?

    what about a small uController (such as ATTiny85) that would "read" a standard servo signal and switch a relay accordingly ?!
  7. Jouellet

    Making PCBS

    Personnally, I use Ammonium Persulfate: http://www.mgchemicals.com/products/prototyping-and-circuit-repair/prototyping/ammonium-persulphate-410/ I prefer that over Ferric chloride which is messy like hell ! I also tried Sodium persulfate, but found Ammonium persulfate more efficient. with 1 Kg...
  8. Jouellet

    I need a PCB designed

    get me some kind of circuit schematic. From what you're saying, it should be fairly simple, so don't worry about the gerber file for now
  9. Jouellet

    Needing a sealing resin

    http://www.smooth-on.com/Castable-Epoxy-Res/c1295_1375/index.html
  10. Jouellet

    I need a PCB designed

    Seriously, you need to get familiar at making schematic: almost everytime you'll ask a question, someone is going to ask for a schematic. it's the language of electronic ! you can get some free package such as Design Spark or even Eagle (I believe) As for how much, get me a schematic, and...
  11. Jouellet

    I need a PCB designed

    if you post the complete schematic, that will give us a better idea of what you need ! I am making PCB with header to receive the Arduino, on a regular basis, but without a schematic, I won't be able to help you ...
  12. Jouellet

    where do you get your "stuff?"

    Definitely Ebay for 90 % of my components For very specific components, Digikey is my #1 choice. I do have about 700+ (seriously) individual drawers, with components and when one item goes low, 2-3 click on Ebay, and it's ordered !
  13. Jouellet

    Loss of voltage with MOSFET

    Bluejets: thanks for the link, but it did not bring any solution Colin Mitchell: connected properly, re-checked Alec_t: you may have portion of the answer. I changed the wire size, and noticed an increase of voltage. I was using protoboard jumper. Cdrive: yes, a heatsink was/is installed...
  14. Jouellet

    Loss of voltage with MOSFET

    Won't change anything. I tried to connect +12 V to the gate, and I gained maybe .4-.5 V at the motor
  15. Jouellet

    Loss of voltage with MOSFET

    Hi folks, I need to pick your brain here... I'm designing a circuit, that will control the speed of a DC motor. it's a geared motor (electric window motor) The circuit looks like this: I know that the voltage out of the charger is far from being perfect, but having a battery shall make it...
  16. Jouellet

    anyone ever used Positiv20 ?

    Hi ! finally was able to get some cans of Positiv20. Anyone ever used that stuff ? Got some good result ? I cannot get any decent result with it ! Tried to spray thin coat/thick coat, tried different exposure time...results are not impressive ! for those wondering what this is, it is a...
  17. Jouellet

    Help Getting Started with PIC Microcontrollers

    If you are totally new to uController, you may want to consider Flowcode (www.matrixmultimedia.com) It is a visual approach to uCtrl programming, extremely easy to use (especially version 5. They are at version 6) It will let you do a lot, before you have to start doing some C programming...
  18. Jouellet

    Newbie Arduino questions

    If you are new with Arduino, my only advise: go on Youtube and look for Jeremy Blum's tutorials Very well made, and easy to understand ! The kid is a genius !
  19. Jouellet

    transistor switching question

    KrisBlueNz: circuit worked like a charm !!! Made new PCB as well Thanks again !
  20. Jouellet

    Is this a good/stupid idea ? LED in //

    Hi Folks, I want to build a seven segment display, about 6" high. each segment will have approx. 8-10 LEDs. LED that I'll be using are rated 3.2-3.4 volts, 30 mA. Supply voltage is going to be around 12 V Normally, one should do the math, put a couple of LED in serial, calculate the limiting...
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