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| Siglent SDS1104X-E noisy fan replacement |
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| ceut:
--- Quote from: tautech on March 18, 2022, 09:47:15 pm ---At just 57mA fan draw use a LM7809 or LM78L09. Best to KISS. ;) --- End quote --- Yes! It was my first idea :-+ But as I do "strange electronics" as some friends of mine tells me, I have made a schematic with 2x diode-bridge to have sufficient voltage drop, and a 45°C Thermal Switch to put the full power to Fan when Temperature is above 45°C inside. I have just closed my Siglent to check what noise it does...cross finger... Edit: I have made a photo to show that the green led is ON a very very very low value when the Siglent is powered down, and only visible at night. Also about 4.4W at the outlet shows on my UT230B wattmeter, and 26W full powered ON without any input signal. |
| Muttley Snickers:
@ceut No worries, the face palm was simply a tongue in cheek poke at tautech who happens to be a dear friend of mine. Your post almost made it sound like he forced you into purchasing this particular scope which we all know he would never do. :) |
| ceut:
--- Quote from: Muttley Snickers on March 18, 2022, 10:38:47 pm ---@ceut No worries, the face palm was simply a tongue in cheek poke at tautech who happens to be a dear friend of mine. Your post almost made it sound like he forced you into purchasing this particular scope which we all know he would never do. :) --- End quote --- Great to read that 8) ;D |
| tautech:
--- Quote from: Muttley Snickers on March 18, 2022, 10:38:47 pm ---@ceut No worries, the face palm was simply a tongue in cheek poke at tautech who happens to be a dear friend of mine. Your post almost made it sound like he forced you into purchasing this particular scope which we all know he would never do. :) --- End quote --- :P You'll never know how many of those curses in your profile were mine. :-X ;D |
| AdiGital:
--- Quote from: Neutrion on March 18, 2022, 03:25:38 pm ---Hi AdiGital! Do I see it right that the Rubycon caps are gone in the power supply? When was your scope built? What kind of caps do you have? When I measured the FPGA heatsink with the original cooling in a closed house, the FPGA temp was much higher than that (Don't remember right but around 50-60 degree Celsius) and the ADC also around 60. Are you sure that you attached the probes right? I measured it with a BM789 with original probes, and didn't even stick it to the metal correctly. Would be an interesting experiment to see whether the ADC would might be less noisier with a heatsink and much lower temp. Did you try to not to destroy the warranty sticker? --- End quote --- Sorry I didn't read your message before and have already removed the probes, put the fan on LM7809 and closed the scope - but if you want I'll re-open and verify - just let me know. The FPGA Version from the system screen shows 2021-07-12, hardware version 01-05. I can also verify the probes with a thermal camera but I trust the measurements. I had all 4 probes showing exact (air) value before I put them inside. They were all firmly attached (by flat face of TO-92) with pretty strong thermal tape that's used for mounting heatsinks. P.S. Already silenced the SDM-3055 and SDG-1062X. The meter's fan is on 6V (LM7806). I didn't log the measurements but checked the temps with thermal camera. Not much heat inside but just in case I added small heatsinks to the warmest components (controller chip and +/-15V regulators on the analog board). The meter is now practically silent. The generator runs on ~8V as its switching power supply does get quite warm. |
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