EEVblog #240 - Power Supply Design Part 8

PART 7: http://www.youtube.com/watch?v=s8b4h_UybLE
After some Arduino hurdles, Dave troubleshoots his DAC SPI driver code in "real time", and takes a peek at an issue with the LCD I2C bus. As well as showing off his PSU PCB for the first time.
The PCB is from Circuit Labs in New Zealand:
http://www.pcbzone.net

Category:

Science & Technology

Tags:

• power
• supply
• design
• psu
• microchip
• arduino
• ftdi
• serial
• spi
• i2c
• debug
• debugging
• ide
• source
• code
• newhaven
• lcd
• dac
• digital
• to
• analog
• converter
• agilent
• oscilloscope
• logic
• analyser
• protocol
• decoding
• troubleshooting
• pcb
• circuit
• board
• labs
• new
• zealand

[DuncM0OFL]

Hi Dave, I'm fascinated to see how this project turns out. I'm sure it'll work well enough and I find my projects usually do too unless I get lazy and fail to complete; a big problem for me. Where I'm weakest however is making the enclosure look good, practical and different enough to stand out from the crowd. When is the next part coming???? when, when when? (Drools)

[EEVblog]

@DuncM0OFL Yes, laziness can be a killer, as you another interesting project to divert your attention. I'm surprised I've got this far with this project!

[thefatmoop]

SHUT UP AND TAKE MY MONEY ALREADY! Seriously though, you ARE going to sell this as a kit right?? I want one of these!

[EEVblog]

@thefatmoop Yes, a kit is indeed the plan.

[EEVblog]

@ssj3gohan456 For the 20th time... This will be a DIY kit. People do not like surface mount devices in kits.

[EEVblog]

@sorin0306 A good 10-turn pot is lot more expensive than a DAC.

[Riskteven]

Hi, I really wonder about power. It is said to be un-clean power in the electric outlets which could damage electronics. (Especially at high K-indices according to Yahoo News) Is there a way to "clean " this from spikes and other things? I have some older music equipment without a "grounded" wall socket plug. So a "cleaner" would be nice too. Have you had any such VLOG?

[SuperDisco91]

Programming my first PWM DAC for college and they are bitches to make work properly..

[shinigamidestroyer]

Love the design! But, why the sudden change to use a 10 bit DAC? Now, you're going to have 2mV steps instead of the original 500uV steps, if my math is correct.

[ForViewingOnly]

Very interesting video. I can't say I understood all of it, but more of this type of thing please Dave! :-)

[DominiHarling]

Dave, do a global search/replace in your code and change SPI_CLK for SPI_SCLK. I saw another error in there.

[fingerboy18]

Looking buff Dave. You must be working hard. All that exercise can certainly explain your enthusiastic attitude! I love it!

As for the board; it is absolutely gorgeous. I'm thoroughly impressed with your work.