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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...
Friday, 26 June 2009 - 15:23
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...
Friday, 29 May 2009 - 20:30
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...
Tuesday, 5 May 2009 - 21:07
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...
Tuesday, 21 April 2009 - 16:37
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...
Friday, 17 April 2009 - 00:46
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...
Thursday, 9 April 2009 - 23:32
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!
Thursday, 2 April 2009 - 19:17
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/...
Sunday, 29 March 2009 - 02:32
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... (...
Tuesday, 24 March 2009 - 23:06
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?
Tuesday, 24 March 2009 - 14:12
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...
Monday, 16 March 2009 - 00:16
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!
Tuesday, 3 March 2009 - 18:58