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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... |
Thu. Feb 14, 2019 - 04:47 PM |
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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... |
Sun. Feb 10, 2019 - 07:52 AM |
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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... |
Sun. Sep 21, 2014 - 06:03 PM |
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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.... |
Sun. Apr 27, 2014 - 08:46 PM |
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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... |
Sat. Feb 15, 2014 - 07:29 PM |
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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... |
Sat. Feb 15, 2014 - 02:45 PM |
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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... |
Sun. Feb 9, 2014 - 10:43 AM |
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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... |
Wed. Feb 5, 2014 - 12:16 PM |
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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... |
Sat. Feb 1, 2014 - 08:39 PM |
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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... |
Sat. Feb 1, 2014 - 05:35 PM |
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Schmitt inverter CMOS or LSTTL I need a fast and robust schmitt inverter in 10ns-20ns propogation delay on the output pin of MCU 74HCT14 compared 74LS14 As I compare them the mosfet variant has more voltage... |
Wed. Jan 29, 2014 - 08:04 AM |
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5V to 3.3V market trend which to choose for power electronic I have a common problem choosing high performance MCU for power electronic applicaitions where severe conditions such as high dv/dt , high voltages, high currents are around. 5V... |
Tue. Jan 28, 2014 - 10:14 AM |