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  1. GPG

    Polarity change for linear actuator logic question

    Yes, his limit switch is in the wrong place.
  2. GPG

    Light flicker (Triacs)

    You need a better lower impedance mains supply :) Try to find out where the drop is. If its at the feed there:s not much you can do except complain to supplier. And what kind of lamps?
  3. GPG

    Interactive LED gaming table

    You need to check the transmissitivity of any cover at 940 especially if its coated/tinted. You could probably use a opto interrupter as a test if its got a big enough gap. Check out plastics as well.
  4. GPG

    Need Help Creating a digital display that counts and saves numbers

    Have used a few counter/displays from here. http://www.redlion.net/panel-meters
  5. GPG

    3 phase motor as generator. Power output?

    They have a lot of voltage drop compared to Schottky. Got any link to the motor?
  6. GPG

    FW rectifier - can't measure DC

    Draw a wire between one of the CH1 leads an one of the CH2 leads. This is the common ground of your probes. Its a short.
  7. GPG

    FSK Demodulator using a PLL

    An xor will work best if both signals are 1:1 mark/space. You can achieve this by dividing them both by 2 eg cd4013 or similar But whether you can depends on the actual carrier frequencies and the data rate. Whether the shift is phase continuous also matters.
  8. GPG

    Polarity change for linear actuator logic question

    SCRs are available that will trigger on a few μA and will hold on a few mA EG: http://www.digikey.com/catalog/en/partgroup/sensitive-gate-scr/16257 To reverse the motor will need 2 spdt relays.( or a bridge driver) The voltage drop across the SCR ca be as high as 2V so relays that have a...
  9. GPG

    Thermoelectric Cooling Cabinet Project

    You need a heat pump, certainly the most efficient way of doing this. Ditch the heater and use the condenser instead. The evaporator does the cooling.
  10. GPG

    Temperature Control SSR Help

    As far as can see, (is there an acronym for that?) You have a controller that will do PID connected to a proportional switch You have to take the 5V output with a ~ 27Ω resistor to drive 20mA to the input of the SSR making the SSR on/off. making sure that it is enabled, Or make an integrator to...
  11. GPG

    Is it possible to find serial output if you know all parts on a PCB?

    I think if you get consistent data the speed is ok. Link to analyser? Got a framing error output?
  12. GPG

    What???

    A friend has a Chinese "chian saw" (printed in the side cover)
  13. GPG

    Need help with school project; photocell, op amp, and 555 timer

    Check the voltage at the opamp output under various light conditions including the laser.
  14. GPG

    Input Jack - 19v. But out the connector is 0.4v?

    Need a lot more info.
  15. GPG

    Calculating burden resistor

    https://www.google.co.nz/search?q=op+amp+compensation&ie=utf-8&oe=utf-8&gws_rd=cr&ei=JVNVVqrhHqiQmgW9poHwAQ
  16. GPG

    MCP 3204 ADC output fluctuation

    Do you mean 30x LSB? Some reading: http://www.analog.com/library/analogDialogue/archives/46-06/staying_well_grounded.html
  17. GPG

    MCP 3204 ADC output fluctuation

    No picture.
  18. GPG

    I Need Some Help With a Level Indicator Project

    I mean for the drill, Looking at it again it may have 2 axis, its hard to make out This has 2 axis drill Abt 8 min in.
  19. GPG

    Is it possible to find serial output if you know all parts on a PCB?

    There are several dividers on the board near the oscillator that divide the crystal down. The frequency will give 75, 150, 300, 600, 1200, 2400, etc. bps
  20. GPG

    I Need Some Help With a Level Indicator Project

    I can only see one axis of freedom (fwd rev) I don't see L/R
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