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benzomobile

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About benzomobile

  • Rank
    Nebula

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  • Gender
    Male
  • Location
    Como, Italia
  1. benzomobile

    GSO Coma Corrector correct spacing

    PS: https://agenaastro.com/gso-2-coma-corrector.html Beppe
  2. benzomobile

    GSO Coma Corrector correct spacing

    Hi, at f5 nobody had problems, as far as I know Beppe
  3. benzomobile

    GSO Coma Corrector correct spacing

    That's an design/assembly issue. It seems many people received faulty GSO CC in last times! Beppe
  4. benzomobile

    GSO Coma Corrector correct spacing

    I know it, thank you. That is a great discussion about visual use only. Sathya pointed out the perfect backfocus - for imaging task, would be different as commonly described (55 vs 75 mm). As former owner of GSO coma corrector, I finded big issues, in terms of coma bad correction and radial chromatic aberration. I find GSO CC - at 75 mm backfocus, definitevely inusable with my 8" f/4 Newt! Speaking about CC phographical use ... Beppe
  5. benzomobile

    GSO Coma Corrector correct spacing

    Hi Satya, what you report is very interesting because I have the same corrector and with the recommended backfocus I see very obvious coma and chromatic aberration! So, when you have tested the distance of the c.c. to 75 mm, have you also seen a form of radial chromatic aberration, ie in direction of stellar elongation? If your answer is affermative, does this chromaticism disappear together with the coma, if the backfocus is reduced to 55 mm? Thank you, Beppe
  6. benzomobile

    DSLR Active cooling MOD process - Part 2

    Hi to all, just two weeks ago, I sent my gerber files to EasyEDA as they can produce ten 'professional grade' pcb for me (for the first one request you will pay only 8 $ , while the requests after the first, will cost just a four bucks more) I should receive the pcbs in two weeks at the most - at least I hope . Then I will test my new dew & TEC controller. If any of you there want it, I'm willing to share my gerbers with SG friends. I attach rendering of controller. Only one thing: you'll have to wait a few weeks yet Beppe
  7. benzomobile

    DSLR Active cooling MOD process - Part 2

    100 ohm! Beppe
  8. benzomobile

    DSLR Active cooling MOD process - Part 2

    There're my schematic Beppe
  9. benzomobile

    DSLR Active cooling MOD process - Part 2

    Hi Gina, the pot is 20 turns one, linear. I needed this resolution to explore the range of the desired set point. When we decide set point would be ever the same - for example 0° C, we can substitue pot with small trimmer, definitely. Beppe
  10. benzomobile

    DSLR Active cooling MOD process - Part 2

    Four yrs ago, I projected and made by myself this controller for Peltier power & dew heather. It controls sensor temperature within the range of +/- 0.05° C. The display shows the applied voltage and the current absorbed by the TEC. Beppe
  11. benzomobile

    DSLR Active cooling MOD process - Part 2

    PS: as Louise has remarked well, a winding diode in parallel to the cap is absolutely essential because It prevents from damaging the final stage of the controller (power) by reverse voltage spikes! Beppe
  12. benzomobile

    DSLR Active cooling MOD process - Part 2

    Hi all, a suitable LC filter to transform PWM signal in quasi continuous voltage (on power output) should have a frequency cut-off of (circa) one tenth of PWM freq, i.e., if PWM freq is 20 KHz, so the LC cut-off frequency will be 2000 Hz. Too small filters don't perform to smooth PWM wave, while big ones do have bad effect on the feedback thermal control because they will reduce control readiness and speediness, resulting in too large thermal hysteresis. For this task, please no high value caps across the power output. Never ever! I put here an example for a correct LC filter for a 20KHz PWM frequency: L (inductance) will be a ferrite toroidal one, value of 1.4 mH C (capacitance) will be a 4,7 uF one. Beppe
  13. benzomobile

    DSLR Active cooling MOD process - Part 2

    Hi. Only one Peltier of 45 Watt is enough to perform >30° C deltaT. Sub zero temperature doesn't make smaller thermal noise in Canon cameras: https://sites.google.com/site/beppelastrofilo/home/canon-1100d-mod-filter-removal-direct-cooling-electrical-dew-control Beppe
  14. benzomobile

    Dec backlash

    Correct tuning of clutch lock is easy doable, too
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