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  1. Replies
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    Re: Strange Contactor Problem

    It's definitely not the relay. I measured voltage across the contactor coil terminals so the relay was doing it's job.

    I had a spare contactor so I've been out today and replaced it then taken the...
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    3
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    467

    Strange Contactor Problem

    Hi, I've built 3 cabinets, each has a relay with a 12V coil that switches 230V which feeds into the coil of a contactor.
    In one of the cabinets, the relay still works but the contactor has suddenly...
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    1,122

    XC16 PSV constants

    I'm having a go at programming a PIC24EP512GP806 bootloader with XC16. I need to define a few constants that the bootloader and application can both read.

    Here's what I've got so far

    const word...
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    1,849

    Re: CALL instruction not working

    I've spent a bit of time trying to get the debugger to work. I'm using an ICD3 but the dsPIC33E/PIC24E firmware seems to be quite buggy when using it as a debugger.

    It turns out that there was a...
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    1,849

    Re: CALL instruction not working

    For the purpose of testing I just had it go into an endless loop in the subroutine.
    I've just added one in after "GOTO $" to rule that out but it's still resetting.
  6. Replies
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    1,849

    CALL instruction not working

    I'm using a PIC24EP512GP806 and I'm writing some ASM30 code in the auxiliary flash section but I'm having a lot of trouble with the CALL instruction.



    CALL sub_error
    BSET led_lat, #led_lat_bit...
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    9,047

    Re: 16-bit version of the WS2801 chip

    Not at the moment. The macro version was designed specifically for what I'm doing and only supports the few chips I use.
    I do intend to make the proper compiler available online when it's done and I...
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    9,047

    Re: 16-bit version of the WS2801 chip

    I use PHP. I've written a macro style language that outputs ASM30 to MPLAB. I'm working on a proper compiler for PHP to ASM30 as well (written in PHP) but compilers are hard! lol

    I started out...
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    9,047

    Re: 16-bit version of the WS2801 chip

    256 steps are alright for color mixing and for big fades but quite often I'll have the lights down to number 3. They are very dim but they can't really fade out with just 3 steps and it looks a bit...
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    9,047

    16-bit version of the WS2801 chip

    I've been using the WS2801 chips for a while now but I'm struggling to get my lights fading smoothly with only 256 steps.
    Does anyone know if there's a 16-bit version? Google didn't turn up any...
  11. Replies
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    7,102

    Re: Switching PSU problem

    I can move the connector to the bottom. It shouldn't be causing this problem though. The PCB has about 6mm of tin around the hole on both sides of the board and the hole is plated through.
    The LCD...
  12. Replies
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    7,102

    Re: Switching PSU problem

    I know it might not be clear from the images but every single screw hole in both PCBs (and the metal connector) are all definitely connected to PCB ground. The ground plane is on the bottom of the...
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    7,102

    Re: Switching PSU problem

    I've attached some pictures which I hope will help. The earth pin on the IEC socket has 2 green wires coming from it. (I've attached an old picture so you can see what's going on behind the PCB....
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    7,102

    Re: Switching PSU problem

    My multimeter says 2KV DC. I'm not sure I can trust it.

    I understand that Ohm's law doesn't allow this condition. 2KV across even 1Ohm would give 2,000A of current flowing through the PSU case and...
  15. Replies
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    7,102

    Re: Switching PSU problem

    The ground of my PCBs (0V negative from the PSU) and the PSU case are both connected to the mains earth.
    They are housed in an ABS box with screws visible on the outside so the whole lot needed to...
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    7,102

    Re: Switching PSU problem

    1 of the components on the PCB is getting slightly hotter than usual but there's not a huge amount of heat coming from it and this is likely because one of the chips draws more current every time it...
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    Switching PSU problem

    Hi,

    I've got several 240V to 12V 150W switching PSUs running circuits I've made. Most are working fine but today one of my circuits started resetting randomly.
    After a long time checking various...
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    HDMI link/picture detector

    Hi,

    I have a projector and some RGB lights that shine on the wall while it's not in use. These lights are manual at the moment but I'd like to automate them.

    Is there any device that I could...
  19. Re: Fuzzlight fades out when running from a transistor

    Hi, Sorry for the delay. I've managed to solve it and it turns out it was my own stupidity.

    I was testing with 2 power sources (additional to the bench supplies).
    1 of them has 12V regulators in...
  20. Fuzzlight fades out when running from a transistor

    Hi,

    I have a 12V fuzzlight that uses about 0.4A current. I'm trying to run it from a 1A 30V transistor (with flyback diode) on a 12V supply. After about 2 minutes the motor suddenly slows down and...
  21. Replies
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    Re: Negative swing with a DAC

    pedja089:-
    I did see your post. Are you suggesting to use that circuit on the output from the DAC? I thought the sine wave was representing an AC supply.

    Dave/Henrik:-
    I've just done a bit of...
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    Re: Negative swing with a DAC

    Sorry, I should mention that I only have 24V DC available from a switching PSU and the amplifier is single supply (not split).

    I could potentially move the entire amplifier ground up by 1.5V as...
  23. Replies
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    4,340

    Negative swing with a DAC

    Hi, I have an 8-bit DAC which is currently outputting about 0-3V. After some filtering etc this goes into the line-in of an audio amplifier.

    Line level is supposed to swing from about -1.5 to...
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    Re: 4 DAC channels from a single PIC

    Jerson: That's a good idea. As long as I can somehow clock the data into the shift register then toggle a line to load the current state into the DAC then that should work perfectly (I will do some...
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    4 DAC channels from a single PIC

    Hi, I'm working on a project that requires 4 audio outputs from DACs but I can't find any suitable.

    DAC requirements:-
    8-bit minimum resolution
    16-bits of data per channel max. My PIC only has...
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