21,789 reputation
12363
bio website n/a
location Toronto, Canada
age 40
visits member for 4 years, 2 months
seen 7 hours ago

c programmer, embedded dabbler, power supply tinkerer. (also loser of three consecutive moderator elections on EE.SE.)

[formerly known as 'madmanguruman' but shed that identity after a nice conversation with Olin Lathrop at Microchip MASTERS 2014.]

almost 15 years experience with switching power supplies at two different companies in the greater toronto area. worked my way from production technician to sustaining engineering, then product development (electrical and embedded). also fluent in vba and labview. currently studying project management theory while working as a power supply designer.


Dec
17
comment Creating a stunning device that causes no harm
Go with a mechanical buzzer that makes a loud noise and vibrates at high speed. Any actual intent to shock is of questionable morality and judgement.
Dec
15
comment Avoiding body diode conduction
A common approach is back-to-back MOS devices with the body diodes connected in series but with opposite polarity. There is no intrinsic way to prevent conduction if the body diode can be forward biased.
Dec
14
answered What is this symbol on the schematic?
Dec
14
comment What is this symbol on the schematic?
@rubix_addict In future put hyperlinks in your question, for example to the app note from where you excerpted the schematic and to a page describing what a SIM900 is. Help others and you'll get the help back.
Dec
14
comment What is this symbol on the schematic?
@ThePhoton Agreed.
Dec
14
comment What is this symbol on the schematic?
I disagree. If it were a relay coil it would most likely have one end grounded as opposed to connected to what appears to be a battery-backed up rail.
Dec
14
comment UL listing for USB device with battery, detachable cord and transformer
@EMFields See meta.electronics.stackexchange.com/questions/2580/… - regulatory questions are not entirely off-topic historically.
Dec
12
reviewed Approve What is needed for basic PIC programming?
Dec
11
comment Unusual voltage drop at BJT (2N2222)
Brush up on your BJT theory. What you're trying to do won't work with what you have.
Dec
9
comment What's an industry standard in electrical engineering?
@Majenko how about GPIB / IEEE488?
Dec
5
comment Unknown part from an old television
How about a side view?
Dec
3
revised open-loop gain and closed-loop gain of op-amp
added math markup
Nov
29
comment MOSFET PWM switch jamming on - why?
I would just put the two of them on a common heatsink and let the natural Rdson positive temperature coefficient take care of balancing. To me, using 200 milliohm resistors to balance the current through 36 milliohm MOSFETs seems like a big power waste, especially if the MOSFETs are up to the task even with imbalance.
Nov
26
answered Debugging a PIC16F84A interface with a 4N25 optocoupler
Nov
26
comment Debugging a PIC16F84A interface with a 4N25 optocoupler
Welcome to EE.SE! By all accounts this is a very good 'first question'.
Nov
26
revised Debugging a PIC16F84A interface with a 4N25 optocoupler
deleted 53 characters in body; edited tags
Nov
21
awarded  microcontroller
Nov
20
answered What facilities/methods exist to debug and simulate programs for PIC microcontrollers
Nov
18
comment How to set the oscilloscope to measure potential between two points that aren't ground?
@pawo38 The fact that your scope is analog is a crucial detail that you did not mention in your question. I have added this detail. In future, if comments elicit information that is absent from the question, edit the question and add the details. (People won't read endless comment threads to get all the details.)
Nov
18
revised How to set the oscilloscope to measure potential between two points that aren't ground?
added 7 characters in body