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elf14 presents - Circuit Assembly Tools Giveaway

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The Circuit Assembly Tools Giveaway!

Engineer and Maker Wishlist | Circuit Assembly Tools Giveaway! | Test and Measurement Giveaway! | Ultimate Raspberry Pi Giveaway! | Project14 Holiday Special

 

 

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Welcome to the elf14 element14 Community!

 

It's the season of gift-giving, so the element14 Community has prepared the Best Circuit Assembly Tools Bundle to giveaway!

 

The below kit will be awarded to the element14 members that add a comment and let us know:

 

What was your best electronics fix or repair?

What 'thing' did you figure out in a project or design, or repair that saved the day?

Tell us your good stories, or if you really don't have any, your best recovered disasters!

 

Contest Opens: 27th November 2020

Contest Closes: 30th December 2020

Winners Announced: After 11th January 2021

 

Register to Enter Now!

 

What We Gave Away!

 

Product NameManufacturerQuantityBuy KitBuy Kit
Wire Kit, Jumper, Male to Male, Solderless, 100 mm - 250 mm, 75 PieceMCM1Buy NowBuy Now
Wire Kit, Jumper, Copper, 0.6 mm Diameter, 350 PieceMCM1Buy NowBuy Now
Anti Static Wrist Strap, Adjustable, 6ft Cord, Blue, Alligator ClipMulticomp1Buy NowBuy Now
Single Channel Soldering Rework Station, 230V, 150WMulticomp Pro1Buy NowBuy Now
Solder Paste Squeege, Synthetic No Clean, PVCChip Quik1Buy NowBuy Now
Solder Paste, Synthetic No Clean, 183 °C, 63, 37 Sn, Pb, 15GChip Quik1Buy NowBuy Now
Solder Flux, Rosin, Soldering, Pen Applicator, 10 ml, 9.3 gMulticomp1Buy NowBuy Now

 

Product NameManufacturerQuantity
element14 presents Prototyping BreadBoardn/a1

 

Congratulations to the Winner!

 

has been chosen, and they have 7 days to respond to the message sent to them!

 

If you do not respond within 7 days, I will have to choose another winner!

 

Terms and Conditions apply.

Parents

  • https://www.eevblog.com/forum/projects/fan-replacement-on-the-rigol-dp832/msg1023425/#msg1023425 Hello gents , I just bought the DP832 and it's extremely annoying ,the fan noise , it's as i have a mill near by , i can't work like this !

    So i have google for a silent fan and found this post .

    I tried to replace the fan with the Noctua NF-A8 FLX but this supply it's a " smart " one. The curent it's monitored, doesn't let me to use this fan.

     

    Tried the method described by johndoe271828 on youtube and the fan speed its decreasing , i need the air out and to benefit the fan silences.

     

    SO again like on many other things i went in to reverse engineering this part of the supply.The original fan it's consuming around 186 mA at maximum speed and 110 mA at lower speed. Apparently  has 2 modes , low speed and fast speed , i measure the voltage at both modes on R 44 which it's used as current sense resistor  . On first i have around 0.8 V on R 44 and 1.5 V on second speed.From my analysis the power supply doesn't control the RPM of the fan , just it's  making  sure it's running , and it's checking that by reading the voltage from U 15 TLC 072C OPAMP on FAN_FAIL test.

    The new fan  Noctua NF-A8 FLX it's not hungry like the original one SUNON, it's needed just 48 mA to run at full speed . I have checked the voltage that is on the R 44 and it's not good , it's triggering the power management ic to show that messages on the screen about "fan fail " .

    So did some math and calculate the value of the new current sense resistor R 44 with 48 mA at 1.5 V and i got around 32 Ohms . I have replace the R 44 with the closest that i had , a 27 Ohms at 2 W .

    The fan it's running now with no prompt of failing fan and it's silent .

    I mentioned that this power supply has 2 modes of running the fan , the first one it's around 8 volts where my fan it's fully silent and the second mode at 12 volt in full speed it's noise it's bearable . Now it's doing the job, taking the hot air out  in silence .

Comment

  • https://www.eevblog.com/forum/projects/fan-replacement-on-the-rigol-dp832/msg1023425/#msg1023425 Hello gents , I just bought the DP832 and it's extremely annoying ,the fan noise , it's as i have a mill near by , i can't work like this !

    So i have google for a silent fan and found this post .

    I tried to replace the fan with the Noctua NF-A8 FLX but this supply it's a " smart " one. The curent it's monitored, doesn't let me to use this fan.

     

    Tried the method described by johndoe271828 on youtube and the fan speed its decreasing , i need the air out and to benefit the fan silences.

     

    SO again like on many other things i went in to reverse engineering this part of the supply.The original fan it's consuming around 186 mA at maximum speed and 110 mA at lower speed. Apparently  has 2 modes , low speed and fast speed , i measure the voltage at both modes on R 44 which it's used as current sense resistor  . On first i have around 0.8 V on R 44 and 1.5 V on second speed.From my analysis the power supply doesn't control the RPM of the fan , just it's  making  sure it's running , and it's checking that by reading the voltage from U 15 TLC 072C OPAMP on FAN_FAIL test.

    The new fan  Noctua NF-A8 FLX it's not hungry like the original one SUNON, it's needed just 48 mA to run at full speed . I have checked the voltage that is on the R 44 and it's not good , it's triggering the power management ic to show that messages on the screen about "fan fail " .

    So did some math and calculate the value of the new current sense resistor R 44 with 48 mA at 1.5 V and i got around 32 Ohms . I have replace the R 44 with the closest that i had , a 27 Ohms at 2 W .

    The fan it's running now with no prompt of failing fan and it's silent .

    I mentioned that this power supply has 2 modes of running the fan , the first one it's around 8 volts where my fan it's fully silent and the second mode at 12 volt in full speed it's noise it's bearable . Now it's doing the job, taking the hot air out  in silence .

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