Nieuw project Hulp nodig?
Laatste reacties
prasimix 3 uur geleden
I've just finished the latest DCM220 dual power module. It is built around LT3763 sync buck that offers current programming and monitoring. Unfortunately it does not provide CC mode of operation indication. Therefore I derived it from FB signal. A 4-channel 12-bit DAC (MAX5715) is used for set output voltage and current (times two for two channels). Instead of using dedicated ADC for measuring output voltage and current a STM32F373 MCU is used which comes with attractive multichannel 16-bit ADC! Output terminals are for 4 mm banana plugs and bi-color LED indicator is used to indicate OE (Output Enable) and CC mode of operation. Output voltage is limited to 20 V (but can be much more since Vin is 48 Vdc) and output current to approx. 4 A. Power outputs are "floated" in regard to other module's GND, but two channels share the same GND on board. Output ripple is pretty good, if we take into account that is SMPS, and e.g. for Iout = 2 A it's below 5 mVpp or 1 mVrms (measured on the output capacitor). So, with three DCM220 one could count on up to 6 programmable power sources packed into EEZ BB3.
EEZ Bench Box 3
Martin Hendelja
Martin Hendelja 7 uur geleden
Small workspace with large possibility to upgrade, still missing some crucial components (like oscilloscope) but I have access to much better equipment at work, and usually this is enough for working on home projects.  Upgrading when I have good deal or when ever it's possible. If it looks like a mess, it's not, trust me, it gets worse. 
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Roel Arits
Roel Arits 10 uur geleden
Updated schematic with comment of "Thialf" about adding a series resistor of 100E in the DATA IN line of the Neopixel LED strip. This resistor will limit any latch-up current that can flow into the DATA IN line when the power supply is switched off, but the microcontroller is still sending data to the LED strip.  
LED gravity balance
HaroldP 1 dag geleden
Interestingly I had little or no interference problems and my home has plenty of wall-warts. Maybe it's because I retuned the IF transformers to 518KHz with a 139pF external cap and I was using a tuned loop antenna also tuned to 518KHz. All I did was wait for a nearby Navtex slot to transmit and then tuned the IF transformer slugs iteratively for maximum signal strength. Have you guys tried this?
Navtex receiver
AndersG 1 dag geleden
Yes, those are the ones I used. Got them from Mouser. They say they have 3 064 in stock curently. What you can do nevertheless is to eliminate things that make a noise in your home.
Navtex receiver