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  1. GPG

    Print Ribbon Roll Back Machine

    And tomorrow,THE WORLD
  2. GPG

    1.5v - 100V input.

    Its not so much about the precision as the ability to accept input well above the amp supply. An LM359 could be used http://www.ti.com/lit/ds/symlink/lm359.pdf A little more setup reqd
  3. GPG

    Calculating burden resistor

    1) Bypasses on amplifier supplies 10μF in parallel with .1μF ceramic on + and - near the supply pins. 2) have you compensated the 741s? (LM358 is internally compensated and one will replace both 741s) 3) You need a dual supply to run the rectifier
  4. GPG

    Any way to check D1889 & B1340 transistors, apart from measuring resistance?

    http://www.datasheetcatalog.com/info_redirect/datasheets/50/240459_DS.pdf.shtml
  5. GPG

    I Need Some Help With a Level Indicator Project

    Use a reversing camera and ditch the mirror
  6. GPG

    An Electronic Symbol

    http://download1489.mediafire.com/obk18p91g97g/plble5746mx7523/High+Side+Driver.pdf Try that
  7. GPG

    Motor runs but not under load

    Possibly http://www.theautomationstore.com/3-phase-electrical-power-from-single-phase/
  8. GPG

    An Electronic Symbol

    Are you using a script blocker?
  9. GPG

    Calculating burden resistor

    N The sign is a tilde not negative which I have used to designate "about" https://en.wikipedia.org/wiki/Tilde Its the main one. In the example I used 1W. A 2.2Ω will dissipate 3.3W The rectifier will produce an amplified waveform by changing one resistor enabling a lower burden resistor The...
  10. GPG

    I cant step up voltage

    https://www.google.co.nz/search?q=shaded+pole+motor&tbm=isch&imgil=7uvUaKUj30xB7M%253A%253BnMyGC_ZQLXTA4M%253Bhttp%25253A%25252F%25252Fwww.directindustry.com%25252Fprod%25252Fjohnson-electric%25252Fproduct-665-1218085.html&source=iu&pf=m&fir=7uvUaKUj30xB7M%253A%252CnMyGC_ZQLXTA4M%252C_&biw=1024&b...
  11. GPG

    An Electronic Symbol

    No motor there though. Looks like a abbreviated diagram of a half bridge driver IC What IC?
  12. GPG

    Calculating burden resistor

    I see you shifted the goalposts! You can repeat the calcs if you wish If you make it more sensitive put a clamp on the adc input to protect it against overvoltage edit Put one on it anyway And the resistor should be connected ala...
  13. GPG

    Calculating burden resistor

    Hence the Q abt range. You can set the resistor value to a convenient value eg power dissipation may be a factor so for 1W dissipation R = 1/1.5A² =.44Ω Say .39Ω (E12 value) this will give .585V RMS across the resistor = .827pk If the output of the rectifier is to be ~5V the reduce the input...
  14. GPG

    Calculating burden resistor

    Max current that you wish to measure and the range of ADC . LM358 is internally compensated dual for example.Multiple sources,variety of packages
  15. GPG

    Print Ribbon Roll Back Machine

    Can you not swap the reels and run the ribbon the other way with the opposite side being used? Much as you could with some old typewriter ribbons?
  16. GPG

    Frequency conversion from 400 Hz to 50/60 Hz

    A lot of power. What aircraft?
  17. GPG

    Calculating burden resistor

    What max current? does the rectifier output need filtering? Use a better opamp than 741
  18. GPG

    Thin Push Pull Motor

    http://www.robotshop.com/en/vs-19-pico-linear-servo.html
  19. GPG

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

    Have to try it and see. RS485 allows 32 addressable peripherals
  20. GPG

    1.5v - 100V input.

    There is another way... http://www.tradeofic.com/Circuit/11577-Norton_precision_comparator.html No divider necessary
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