Type in the full discussion title or a part of it.
Discussion Title Created date
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
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
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
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
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
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
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
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
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
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
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
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

Pages