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DSO oscilloscope saving single shot trigger event to memory for power supply startup
I need a feauture for a DSO, but dont know which DSO brands are capable of doing it. My Fluke 199C seems not to have this feuture. I want to save the first 100ms of the power...
Wednesday, 20 March 2019 - 11:18
Recommendation for Power factor correction control Buck or Boost?
I have a 3 phase 400Vac supply rectified to 540VDC.   A full bridge phase shift converter converts the 540VDC @10A to 10Vdc @500A.   I try to figure out a power factor...
Thursday, 7 March 2019 - 14:11
Should I cool an inrush limiter NTC or not? Advantages/Disadvantages
For inrush current limitation of a 500uF capacitor @540VDC (2 series connected 1000uF 400V rated caps.)   I use 5 Ohm NTC with a stedy state current of 30A. The capacity of...
Thursday, 14 February 2019 - 16:47
Transformator Flux balancing capacitor selection
For a full bridge phase shift converter I need to place a series capacitor to the bridge transformer . This will prevent dc current in the trnsformer core and avoid core...
Sunday, 10 February 2019 - 07:52
lm331 cheap alternative as smd
I can not find an smd version of lm331 voltage to frequency converter in farnell rs or avnetexpress. Anyone can recommend a cheap equivalent in smd package?. I need 0 to 10V input...
Sunday, 21 September 2014 - 18:03
roller bearing guided small aggragtes on elliptical path
I design several small aggragtes moving along an elliptical path in an endless turning sequence. My probrem is , I am searching some robust ways to send data to these aggragtes....
Sunday, 27 April 2014 - 20:46
SMD ferrite beads to supress noise when driving mosfets
I found a very interesting element a ferrite bead in smd form. It has 0.015ohm resistance until 1MHZ and after 1MHZ the resistance rise light parabolically to a value of 50Ohm at...
Saturday, 15 February 2014 - 19:29
Paralelling 2 BJTs NPN-PNP totem pole
I try to lower the junction temp of a totem pole containing npn/pnp bjts. (see picture) The unit zxgd3004E6 can give peak 8A and when working at a frequency of 500khz driving a...
Saturday, 15 February 2014 - 14:45
SOT23-6 package, Any experience for DIY reflow soldering
I noticed that the new package that the manufactorer insists is sot23-6 (6 pins) rather than sot 23 (3pins) 2 back 1 front. As sot23 has 2 back and 1 front the effective distance...
Sunday, 9 February 2014 - 10:43
MLCC versus Mica capacitor for high power RF transmitter
For an LC series network of an high power (20KW) RF transmitter designed to resonate at 600Khz to 1.2MHZ, I compared some capacitor types. The capacitor should be able to hold...
Wednesday, 5 February 2014 - 12:16
74HC86 has schmitt triger inputs or not?
I can find nand and inveter logic with schmitt triger inputs. But when it comes to xor gate, it seems unclear. I looked at the datasheet from nxp year 2007. it says it has a...
Saturday, 1 February 2014 - 20:39
Level shifter or not ?
For 3.3V output dsps i can drive the TTL loads as they are more tolerant. But as my application must be noise immune, CMOS seems to have better noise blocking capacity. What would...
Saturday, 1 February 2014 - 17:35

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