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2h
comment flyback converter transformer selection
Voting to close as 'too broad'. You need to gather some fundamental knowledge first, then ask specific questions about specific problems with your design process. Asking how PWM controllers work, how to choose a transformer, and whether or not you need feedback is waaaaay too broad for a single question.
2h
comment Bridge rectifier - min. required protective resistor
@delmadord Typo/boo-boo fixed.
3h
revised Bridge rectifier - min. required protective resistor
edited body
4h
answered Bridge rectifier - min. required protective resistor
Jan
30
awarded  Revival
Jan
27
comment capacitor ripple current in buck converter
Let us continue this discussion in chat.
Jan
27
revised How do I work out energy stored in a capacitor bank?
edited tags
Jan
27
comment How do I work out energy stored in a capacitor bank?
I think you're slightly off. Hint: If each Cb is 20 microfarads, what is the total equivalent capacitance of the bank of (Cb + Cb) // Cb? After that, it's merely a matter of applying the correct formula...
Jan
27
comment capacitor ripple current in buck converter
I say this again: the ripple voltage is a function of the ESR of the output capacitance. If you change the output capacitors, you are changing the ESR and will change the ripple voltage. There is no way to predict how the ripple voltage will change unless you specify how much ESR the capacitors have!
Jan
26
comment capacitor ripple current in buck converter
Putting more capacitors in parallel reduces the ESR (the indivudial ESRs are in parallel, the total ESR is less) which reduces the ripple voltage. The ripple current remains unaffected.
Jan
26
comment capacitor ripple current in buck converter
ESR affects the ripple voltage. The ripple current is constant - it is unaffected by the capacitance.
Jan
26
answered capacitor ripple current in buck converter
Jan
22
comment Designing USB device
Get a copy of Jan Axelson's USB Complete and read it cover to cover.
Jan
22
comment Designing USB device
+1 I've also played with the PIC24FJ64GB00x family of parts for USB devices. The Microchip MLA code for USB is a very helpful starting point but takes a little 'massaging' to make it production-ready.
Jan
13
awarded  Nice Answer
Jan
13
awarded  Necromancer
Jan
10
awarded  Nice Answer
Jan
4
comment PIC32 acting as USB CDC HOST to FTDI
Why connect VBUS if the USB module isn't being used? The FTDI chip should have its own bus sensing input and should take care of all the bus arbitration. The PIC32 should only be dealing with UART.
Dec
23
comment Mains LED light bulb flickers when switched off
What a great article you cited. I've read similar for CFLs, this is the first LED teardown that I've seen. Nice nice nice.
Dec
21
reviewed Close How to decode this 433MHz RF signal?