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How to calculate switching speed of BJT?
Hi there - I'm using some BJTs as switches in a fairly fast (1MHz) MOSFET driver. What I'm not sure about is how to calculate out how fast the BJTs switch. I mean with MOSFETs you...
Fri. Jun 26, 2009 - 03:23 PM
Design of an active load
Hi there - I'm planning on building a fairly powerful (by my standards at least) active load circuit. I'm aiming for 75A and 500W. I'm figuring I'll be dissipating essentially all...
Fri. May 29, 2009 - 08:30 PM
soldering old parts
Hi there - we're having a board at work fail when a connector gets even slightly stressed. Turns out, when the SMT connector was originally reflowed, the profile was off or...
Tue. May 5, 2009 - 09:07 PM
Running Ethernet through a non-standard connector
Hi - I may need to run Ethernet through a very non standard connector. This'll be hand crimped/soldered. It probably won't be the correct impedance. Does anybody have a feel for...
Tue. Apr 21, 2009 - 04:37 PM
sizing MOSFETs for use as an active load
Hi there - I'm working on a circuit that will characterize battery cells. I'm planning on discharging it through a FET, and actively regulating the gate of that FET to maintain a...
Fri. Apr 17, 2009 - 12:46 AM
What happens to outputs in power down mode?
Hi there - I'm planning on using an ATMEGA32M1 on a board that needs to go into an ultra low power mode for long periods of time. When running normally, I plan on it using a 16MHz...
Thu. Apr 9, 2009 - 11:32 PM
MCPCB manufacturers
Hi there - I'm looking at having a small run of metal core PCBs made up. Can anybody recommend any manufacturers? Ideally ones that are happy to do low volume... Thanks!
Thu. Apr 2, 2009 - 07:17 PM
AVR buck converters
Hi there - I'm looking at rolling my own buck converter with an AVR acting as the controller. I want to use a CAN AVR - so that puts me at using the AT90CAN128 or the ATMEGA32M1/...
Sun. Mar 29, 2009 - 02:32 AM
General transformer questions
Hi there... I am trying to find a transformer. But first I need to understand what these datasheets actually mean! I'm looking at this part: http://www.coilcraft.com/pdfs/he... (...
Tue. Mar 24, 2009 - 11:06 PM
What does filar mean, with regards to transformers?
I was looking at these parts: http://www.coilcraft.com/pdfs/he... and they talk about "One 6-filar winding", "Two trifilar windings", etc. What does this mean?
Tue. Mar 24, 2009 - 02:12 PM
high side N-FET gate driver
Hi there - I want to make a high side N-FET gate driver with discrete parts and an AVR. I know there are plenty of fully integrated solutions for this - but I'd just rather roll...
Mon. Mar 16, 2009 - 12:16 AM
Adding data signals on top of DC power lines
Hi there - I've heard of various people modulating a signal on top of their DC power supply. Can anybody explain what the general concept for how this works is? Thanks!
Tue. Mar 3, 2009 - 06:58 PM

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