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  1. Replies
    202
    Views
    18,151

    Here you go servo5 asm...

    Here you go

    servo5 asm
    servo5 bas

    The program was created in picbasic. The complete code space was used so any additions will require functions to be removed or a PIC with more code space.
    ...
  2. Replies
    202
    Views
    18,151

    Maybe the work I did a few years ago may help...

    Maybe the work I did a few years ago may help save you some time and effort. The controller I built used a PIC processor controlling 1 or 2 servos with all settings including end stops, time delays...
  3. Replies
    5
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    1,039

    Yes the MBR745 diodes need heatsinks. At full...

    Yes the MBR745 diodes need heatsinks. At full load they will generate greater than 2.5W each.

    The PCB was designed so a single heatsink interface can be used for all 5 TO220 devices. The MBR745...
  4. Replies
    6
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    1,494

    VFD 101 The frequency will either be 50 or...

    VFD 101

    The frequency will either be 50 or 60Hz depending if it is a European or US player. The 3V is used to heat up a wire filament at the front of the VFD and as such doesn't usually mind if it...
  5. Replies
    16
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    2,222

    Simply load the -12V output with a 1k ohm...

    Simply load the -12V output with a 1k ohm resistor and it will bring the voltage back down.

    Without a load (multimeter does not classify as a load as it has a very high input impedance) the filter...
  6. Replies
    10
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    1,597

    From my brief investigation of the tv connctor...

    From my brief investigation of the tv connctor pinouts, this is what i found

    Top
    1 - Gnd
    2 - R audio in
    3 - 5V pulses
    4 - Unknown signal
    5 - 5V DC
    6 - unknown
    7 - NC
  7. Replies
    10
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    1,597

    Has anyone done this and noticed that none of the...

    Has anyone done this and noticed that none of the buttons will work afterwards and the unit makes a soft buzzing sound? My guess is that it locks up the button scanning and renders the rest of the...
  8. Replies
    27
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    2,353

    The SA28A diode was most likely inserted the...

    The SA28A diode was most likely inserted the wrong way around.

    Its a 28V zener transient suppression diode. Its used to dissipate voltage spikes from leakage inductance in the flyback circuit.
    ...
  9. Replies
    9
    Views
    1,534

    Sounds like you have put the SA28A diode back to...

    Sounds like you have put the SA28A diode back to front and it is short circuiting. Double check the diode directions. Best practice would be to replace both diodes with new ones, as if they got hot...
  10. Replies
    23
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    2,970

    The dot in the circuit diagram is to signify the...

    The dot in the circuit diagram is to signify the direction of the transformer winding. A positive voltage applied at the dot end of the primary winding should induce a positive voltage at the dot end...
  11. Replies
    23
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    2,970

    I did some checking on the renco datasheets and...

    I did some checking on the renco datasheets and found that the RL-5533 from renco and the T6 from coilcraft are not pin compatible. Pins 1 and 2 are reversed on the renco transformer so flyback...
  12. Replies
    23
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    2,970

    Ok so I had to look at the circuit diagram to...

    Ok so I had to look at the circuit diagram to remind myself how I made this thing but as far as I can tell you have two possibilities.

    No load tests

    If you are getting the +12V but no -12V...
  13. Replies
    11
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    1,793

    Send me your shuttle FV-24 and all the other...

    Send me your shuttle FV-24 and all the other parts you want to power and I will test them for you (on the understanding that i can keep the parts ;-) ). Otherwise, how the hell should I know how...
  14. Replies
    41
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    2,623

    This is where a basic knowledge of electronics...

    This is where a basic knowledge of electronics principals would have helped you. To measure voltages with a meter you connect the meter in PARALLEL with the device your want to measure the voltage...
  15. Replies
    41
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    2,623

    1.3A is what the National design program produced...

    1.3A is what the National design program produced and I had no evidence to disprove it. Coilcraft did not display the current rating of their transformer.

    Very little current is used by the -12V...
  16. Thread: Making a PSU

    by sproggy
    Replies
    23
    Views
    2,681

    Hi I don't see anything wrong with what you've...

    Hi

    I don't see anything wrong with what you've done. It should work fine. :-)
  17. Replies
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    964

    Good discounts there. Shame none of them are...

    Good discounts there.

    Shame none of them are suitable for directly powering a PC
  18. Replies
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    705

    The power consumption should be labelled on the...

    The power consumption should be labelled on the back of the monitor. Typically a 14" CRT monitor will consume about 150W

    Sproggy http://www.sproggy.com
  19. Thread: Empeg

    by sproggy
    Replies
    6
    Views
    1,027

    I have seen those displays for sale in the UK at...

    I have seen those displays for sale in the UK at Farnell. The 128*32 display (guessing that is in the EMPEG) costs 115 ($160)

    Empeg probably buy in bulk direct from Noritake Itron and get them...
  20. Replies
    10
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    1,842

    Something to note about the Cyrix chips is that...

    Something to note about the Cyrix chips is that they consume a lot of power and generate a lot of heat.

    My player uses a M2 300 chip and it requires a considerable size heatsink and fan to keep it...
  21. Replies
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    1,119

    An 8A fuse should suffice but if you want tighter...

    An 8A fuse should suffice but if you want tighter protection use 5A
  22. Replies
    5
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    1,102

    Less efficient means that more power is wasted as...

    Less efficient means that more power is wasted as heat and higher input current is required for the same output power.

    The more current you take from your battery the sooner it will be drained
  23. Replies
    7
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    1,208

    oh and if you get wierd charachters on the...

    oh and if you get wierd charachters on the display (whole display, not just random charachter errors) then one of the data lines has a bad connection.

    If you get random charachter errors/jittery...
  24. Replies
    7
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    1,208

    No charachter LCD should get hot to touch. If it...

    No charachter LCD should get hot to touch. If it does you have it wired incorrectly and risk damaging it. Some of the LCD backlights require a current limiting resistor to reduce the voltage going to...
  25. Replies
    3
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    891

    Sorry to disapoint you but a step up converter...

    Sorry to disapoint you but a step up converter like the MAX1771 will be no good for the 12V because if the input voltage is higher than 12V then the ouptut voltage will be the same. You could make a...
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