EEVblog #221 - Lab Power Supply Design - Part 1

PART 2 is HERE: http://www.youtube.com/watch?v=6Otr1I0OR18
Dave shows you how to design a simple constant current and constant voltage lab power supply that can be either software (PIC/AVR et.al microcontroller) or traditional pot controlled.
Starting with the venerable LM317, and ending up with an LT3080 solution, and the some thought processes that go into it all.
Part 1 is the conceptual design of this Open Hardware design.

Category:

Science & Technology

Tags:

• lab
• laboratory
• bench
• power
• supply
• variable
• fixed
• design
• lm317
• lt3080
• linear
• switching
• schematic
• build
• concept
• circuit
• theory
• how
• it
• works
• diy
• Do It Yourself
• Electronics
• Technology
• voltage
• current
• constant
• regulator
• pot
• control
• pic
• microchip
• atmel
• arduino
• software
• pwm
• pulse
• width
• modulation
• filter
• comparator
• measurement
• shunt
• resistor
• transistor
• opamp
• microcontroller
• avr
• open
• source
• hardware
• oshw

[fridgebulb]

Awesome first part, look forward to the follow up finishing it off!

One question though, whats up with your right thumb dave?

[EEVblog]

@fridgebulb You need to follow me on Twitter :-> I slammed it in a door jam. Why does everyone assume I hit it with a hammer?

[sorin0306]

Good job Dave!

Thanks for your wonderful videos.

but, don't you think that driving LT3080 through external OP, compromise the circuit stability of the LT3080???

[EEVblog]

@sorin0306 No, it won't affect the stability, the topology used ensures that.

[EEVblog]

@scientist375 And the Makezine videos are quite lacking in detailed explained content. If you like that, fine, but it's not the way I like to explain stuff. I chose to show you some of my thought processes in the design, and that takes time. You can't magically shorten it, there is only so much you can fit in 5-10 minutes.

[joshstube]

I love these style of design videos Dave!

I don't know what's coming up next with your next 2 installments, but can I ask why you chose 1Amp? (nice even number?)

This project would be more useful to me if it were 1.5A or 2A . . . but I'm guessing there would be too much heat, and you would need different parts??

Am I right?

How much higher could you drive your current with this configuration?

Love the EEVBlog Dave!

[adisharr]

My new favorite video blog - thanks for all your work on these Dave :)

[santoroma17]

any advise for a beginner high school student

[AgentDexter47]

I am going to technical high school and I really must say that you explain much better than most of my teachers XD

we are currently doing right that - internals of power regulators!

I really love your vid's

Now I see that I've missed whole "Lab power supply" series

this is going to be a long night =D

[javedkhan0258]

GOD BLESS EEVBLOG lol

[deebsboy]

I needed to see this. Thanks so much for the great videos!

[waswestkan]

@linagee I'm a true hobbyists not even close to an EE. I hung through to the end of the vid caz I'm here to learn

[waswestkan]

I figured Dave bruised his thumb nail by jabbing on the white board or meter face too hard. Good thing Dave isn't chef with a knife in his hand when he starts accentuating a point he wants to make. Tweeting your ouwies Dave? Must have been a slow day ;)

[linagee]

With this video you seem to have separated the hobbyists from the true EEs... Hah. :-)

[PrimaSilica]

@EEVblog probably because it's a round bruise. Maybe they assume you've got bad hand-eye coordinatation! :P