21,369 reputation
12257
bio website n/a
location Toronto, Canada
age 40
visits member for 3 years, 11 months
seen 23 mins 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.


11m
revised How to get more than 100mA from a USB port
dead link flagged
1d
revised What caused my servo to burn out?
added 67 characters in body
1d
comment What caused my servo to burn out?
The one that was originally there before OP edited the question. Maybe you don't have the reputation to see the history of the question. The original title was "What happens if you use a load that exceeds the maximum regulated current output from your power supply?"
1d
answered What caused my servo to burn out?
1d
comment What caused my servo to burn out?
Also, specifying which power supply you used will help with that part of the question.
1d
comment What caused my servo to burn out?
Posting a schematic / drawing / photo of what you wired up plus specifying which motors you used would go a long way towards helping you get answers.
Sep
11
comment Generating a variable DC signal with PWM
Your question is not really how to design an RC filter to turn a PWM signal into a DC level, but "How do RC filters actually work?" - this is what you need to look up. If you understand how an RC filter works, you will understand implicitly how a time-varying signal will get averaged by it.
Sep
11
comment Generating a variable DC signal with PWM
You haven't specified your PWM frequency or required response time of the filter. Also, what do you mean by "DC signal not analog"? DC signals are perfectly analog in my opinion.
Sep
11
revised Generating a variable DC signal with PWM
deleted 21 characters in body
Sep
10
revised Ground connection in differential signals
deleted 11 characters in body
Sep
10
comment Sending signals to PC over wifi
This seems like an opinion-based shopping question and will likely be closed unless it is reworked.
Sep
10
comment RTC DS1307 3.3V I2C and Oscilloscope impedance
Which STM32 module are you using? Are you connecting GND between the STM32 and the DS1307?
Sep
10
revised RTC DS1307 3.3V I2C and Oscilloscope impedance
deleted 197 characters in body
Sep
10
comment Power supply ringing when servo activates
Is your input supply actually a battery? Please describe it in your question - type of supply, rating (if a source) / capacity and tecnhology (if a battery) - the fact that the load change is causing the input to sag by 1.5V is going to be difficult to work around when there doesn't appear to be an input feed-forward within the IC.
Sep
9
answered Is my PSU design safe, what should I change?
Sep
9
comment Is my PSU design safe, what should I change?
I'm not sure he appreciates the risks involved with playing around with a +170V DC output. The GFCI will of course protect inadvertent contact with the mains. If he's putting this in some sort of box, an earthed output return should be part of the safety consideration.
Sep
9
comment Is my PSU design safe, what should I change?
I don't think a GFCI will help him with the output floating. The return should be earthed and the fuse put in the proper place (the line / hot input).
Sep
8
answered Could a modified sine wave inverter destroy/damage the AC adapter for a laptop?
Sep
8
comment Slow start up of LM3578
The datasheet only guarantees operation from 2V, so if your batteries are sagging below that, you'll either need some sort of soft-start circuit or some extra cells to stay above the minimum operating voltage.
Sep
8
revised Arduino crashes switching 230V relay OFF
schema != schematic