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20% OFF 3 stuks DC-DC 3V-35V naar 4V-40V instelbare boost-stap-omhoog-voedingsmodule 3V 5V 12V naar 19V 24V 30V 36V 11,06€ 13,83€ View It

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Johnny_B_Goode 14/08/2022

Bought 3 & tested 1. At first I thought it wasn't working properly until I noticed the current limit lamp on my cheap 'n' cheerful (it gets the job done but can't indicate the current limit setting like its more expensive cousins) LW-K3010D bench power supply was lighting up - I'd simply forgotten I'd set it to just over 0.5A for a previous test. /slaps head/ At 1.6A load, the inductor runs hotter than the IC but since this is powering an LPRO 101 rubidium oscillator, the current demand drops down to half an amp after two or three minutes and everything runs much cooler thereafter. The voltage varied by a few millivolts with temperature during my tests but this is a vast improvement over the hundreds of mV variation between the three 19v laptop chargers I've tested my rubidium frequency reference with and will allow me to pick any one as a power source without upsetting its micro Hertz accuracy. Up to now, I've been using the 19 volt directly to power the LPRO (dc input rating of 19 to 32 volts with 24 volts being the nominal recommendation). I'll be setting this boost converter to output 22 volts which will allow me to standardise on these cheap and ubiquitous laptop chargers for not just this one project but all of my other DIY frequency standards. I'd decided very early on to keep the mains PSUs out of my frequency reference enclosures to minimise thermal issues and the down time to repair them in the event of a psu failure (they run 24/7). Fixing such failures is now simplified to merely swapping out the dead wallwart or laptop charging brick with another good unit taken from my plentiful stock of spares. The attached image show the boost module parked on top of my Rubidium oscillator (RFS) with the scope behind showing just over 16 hours of infinite persistence recording the RFS phase shifting relative to my GPSDO (which as its own 6ns pk-pk disciplining wobble). Please note the unusually high ambient temperature for the UK (36.16 is the base plate).

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