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  1. gorgon

    Device questions

    I really had the overall design limitations in mind, not the individual parts. Only the USB connector will be bigger than this rice grain, even the tiniest micro version. If you can't disclose more of the function, how about what's necessary to connect to this 'rice grain'. A 15 pole connector...
  2. gorgon

    Device questions

    What sort of overall size are we talking about, and type and specification of the signals you want to transfer? I saw analogue signals suddenly appeared, and that's a bit different from some digital keyboardlike signals. TOK ;)
  3. gorgon

    For the young, aspiring Engineers!

    :D :rolleyes:
  4. gorgon

    can we use higher bit ADC for lower volt full resolution

    You have two ways to do this. You can amplify the 3V to fit into the 10V range for 15bit or 20V range(if you talk about a 0-3V input range) for a 16bit range. To do the last you'll need to do some tricks with offset and 0V level, if your input amp is bipolar. Or, you can reduce the ADCs...
  5. gorgon

    Cannot Get Video Amp to work

    Could be noise from bad decoupling capacitors. Or ground loop noise. TOK ;)
  6. gorgon

    adjusting the LM317LZ IC

    Don't you need the 240 ohm for the reference to work properly, even with no load? I don't really know, but I would think it would get a bit restless on a capacitive load only. Might not be a problem on an incandescent lamp? TOK ;)
  7. gorgon

    Cannot Get Video Amp to work

    The amp is working like it should(or can), but since it is a DC amp it will also displace the voltage value of the signal. Since the composite video is level sensitive, you are in fact reducing the signal level down into the sync area of the video signal. If you add an opamp to drive the...
  8. gorgon

    Latching circuit problem

    Why not use the periscope as a light leader :D TOK ;)
  9. gorgon

    Led Video screen!!

    I have no idea of what sort of video feed you have in mind. It's been 22 years since I worked in the broadcasting world, and we used only analogue video at that time. So my knowledge base is defined by that. If you base your design on 16x16 modules, the task is not overwhelming. One factor to...
  10. gorgon

    9 bit converter in cupl

    Is this an actual assignment or just your own idea? The 22v10 has not enough basic capacity to do this this task. It has only 10 macrocells, each with 7 or 8 product terms. If you put a number of GALs together you may manage it, eventually. But I'm far from certain you will succeed. If...
  11. gorgon

    Latching circuit problem

    The first circuit(3:00 min) in the video is equal to my solution to the OPs problem. Replace the 2 switches with reed switches and yo can turn on and off the power inside the sub, from the outside. Add a small blinking LED as an indicator that the power is on, and you can verify the power on/off...
  12. gorgon

    Led Video screen!!

    I suppose you know that each RGB LED consist of 3 separate LEDs, so even your 5x5 matrix has 75 LEDs in total to control. You should search for a multi LED controller chip for this task, and use as many of those you'll need to control the total number of LEDs. TOK ;)
  13. gorgon

    9 bit converter in cupl

    Ok, so we're down to what you want displayed. If you want to display the 9bit BINARY value into a DECIMAL presentation, like 000 to 511, you need to convert the value to a 3 digit BCD. If you on the other hand can cope with the 9bit BINARY to a 3 digit OCTAL presentation, like 000 to 777, you...
  14. gorgon

    trying to regulate dc voltage

    Are you sure that this radio is made for 12V, and not made for a 6V motorcycle system? If it works at 6-7V you could just use a small DC-DC switcher to convert down to this voltage. TOK ;)
  15. gorgon

    Latching circuit problem

    The weekend turned out to be more than full, and no time to draw anything. I haven't forgot, yet :) TOK ;)
  16. gorgon

    Design & Prototype

    What you could do depends on what your design is. Is it a physical design you could just make a mockup or nonfunctional (no electronics) design prototype. If you need a functionality to demonstrate a prototype, you could rip open and patch up an existing keyboard electronics with some keys...
  17. gorgon

    9 bit converter in cupl

    If you only need to look at the 9bit binary value, use 3 normal 7segment decoder chips. Or you can of course use 3 of the GALs for this, but a 3bit to 7segment decoder is a bit overkill if you don't have them around. You should be aware of the the GAL chips normally use a lot of current, if you...
  18. gorgon

    Latching circuit problem

    Why not use a P-channel MOSFET to switch the power ON with self hold, and another transistor to turn it OFF? I'll make a diagram later this weekend when home. TOK ;)
  19. gorgon

    futaba servos with 8051

    I suppose you send the pulse every 12-20ms? You need to transmit a continous train of pulses, each pulse in the range between 1-2ms to reflect the position. TOK ;)
  20. gorgon

    PID - unstable after applying load

    There are several things that may interfere with a stable situation. If you have implemented a complete PID regulator the D part may fight the I part and create unwanted feedback. In many cases you may need to implement a deadband to stop the regualator to 'hunt' around the stable position...
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