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  1. redwire

    0-30V Stabilized Power Supply

    Hi raresvintea,  It appears that you used the original design that has several parts that need to be upgraded.  Papuga posted the most recent sketch and parts list two or three threads above your post. 
  2. redwire

    0-30 Vdc Stabilized Power Supply

    Sorry, not familiar with PIC
  3. redwire

    0-30 Vdc Stabilized Power Supply

    hi piyushghumelia,    I wonder if you really hooked this up in real world.    The diagram does not show any connections to sample the voltage of the  power supply and the code provided does not show any computations to  determine voltage or current. The diagram looks like a generic LCD hookup...
  4. redwire

    About "Voltmeter + Ammeter LCD panel" project

    Hi morpheous87,  with the right tweaking you can get the display to work with much higher voltages.   I set mine up to work up to about 60 V.     It's been many years since I worked with this but here are some of the issues: 1.   The voltage signal to the chip must be less than 5 volts so the...
  5. redwire

    0-30V Stabilized Power Supply

    Was anyone able to open Javierhm's Eagle file?    I tried to open with version 6.3.0 with no luck.
  6. redwire

    DIY A motorcycle made by electronic materials

    cool
  7. redwire

    0-30V Stabilized Power Supply

    Tompa,  How many and what type (T0-3 or T220 package)  of output transistors are you using.  The heat sink looks a bit small.    Without being able to see the amps clearly,  I am assuming you are pushing 4 amps  and the output transistors are  having to burn off over 80W.
  8. redwire

    Reversing switches

    What Hero999 described using the DPDT switch is about the simplest method to hook this up.  Of course you will need to hold the switch while it closes but hey, perhaps there are days when you only want the curtains partially closed.  Using your button method you could only be full open or closed.
  9. redwire

    Reversing switches

    How far apart are the pullies?  Just thinking about using one motor with a lever attached to the outer hub and the  stop could be located in a slot that travels back and forth driven by the lever.  The way I would approach would be to use a small microchip programmed to do the following: 1...
  10. redwire

    0-30V Stabilized Power Supply

    fly3rman   You are correct about the output transistor.     Connections 7a (spare) and 7 for offboard power transistor (collector).   Connection 8 is the base connection for power transistor and point 3 is the backfeed from the power transistor emitter.    Connection 1 is a spare for the lcd...
  11. redwire

    0-30V Stabilized Power Supply

    Fly3rman ,    The pcb you reference was copied from the 1st post  on page 1 and is still current.    Given it is a double sided board it is a little more difficult to build at home.  I had some commercially made pcb's  from that board file so I know it works.
  12. redwire

    0-30V Stabilized Power Supply

    jssteve126,  Outstanding job!!      Looks like everything is heavy duty.  How many amps have you brought it up to?
  13. redwire

    Newbie: USB as power source for a 75w device?

    If you are connecting to a computer you won't even come close to getting that kind of power.  Typically the power is limited to 500 milliamps at 5 volts for USB 2.0 and 900 milliamps for USB 3.0.  Different models may vary but that's around 2.5 to 4.5watts  .
  14. redwire

    atmega8 volt/amp meter

    This is tough project for a first timer to get a LCD going on.  I know this from personal experience.   There are so many things that can prevent a successful project.   First did you get confirmation that the IC was successfully loaded with code?   What hardware did you use to program?   Are...
  15. redwire

    0-30V Stabilized Power Supply

    morpheous87 , Arduino ground is  TB4 pin 2 Connect the Arduino's ADC pin  to TB4 Pin 1 on your power supply.    Note that you are simply measuring the voltage drop across the 0.47 ohm resistor.  If you had a 3 amp load on the PS then your voltage drop across the resistor would be 0.47x3 =...
  16. redwire

    motor specification

    I guess you didn't do a google search?    http://www.servocity.com/html/101_rpm_gear_motor.html
  17. redwire

    0-30V Stabilized Power Supply

    morpheous87 Well yes and no.  I am refering to  the 0.47Ohm resistor that is connected to TB4.  I say this with a little hesitation because on the Bill of Materials, R7 is listed as a 3k9 resistor which I believe is an error.  The pcb shows R7 as being connected to the led (I think this...
  18. redwire

    0-30V Stabilized Power Supply

    morpheous87 Attached is an example of how to calculate your voltage divider.  Note that I added a potentiometer in the circuit so that once the program is written, you can calibrate it without have to reprogram the chip because of tolerance differences in resistors. For the current...
  19. redwire

    0-30V Stabilized Power Supply

    Hi  Lighty    Is this what you were thinking of making?
  20. redwire

    Where to find solder tips

    When you say the RS iron was too big were you referring to the size or wattage.  I know they sell a 15w iron compared to your Weller 23-25w iron.  The tips for the Weller are only about $3-4  on the internet, so I doubt free shipping is going to be offered. 
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