Neat looking power supply kit.

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This looks like a nice project for people getting started in electronics. *Corrected link. Moderator*

 

http://www.banggood.com/EU-220V-...

Last Edited: Fri. Sep 18, 2015 - 06:09 AM
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That's cute!

 

I use one I got from ebay a few years ago for 8 bucks. A tiny board with DC converter and 3 digit display. I power it from an old laptop power supply.

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut. 

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Nice, looks like it also has a clock generator and logic probe as well.

Looks like it would be handy for a student to use to learn EE degree.

 

Jim

 

 

(Possum Lodge oath) Quando omni flunkus, moritati.

"I thought growing old would take longer"

 

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http://www.ebay.com/itm/Mini-3A-...

 

This is a DC-DC converter about the size of a thumbnail that costs about a US dollar.  It regulates from about 2VDC to 20+VDC (potentiometer adjustable) from a +15 to +20VDC input wall-wart (also a few US dollars),  current up to about 3 Amps, and 85%+ efficiency. The IC has standard power supply protections in its design.

 

In my humble opinion, it is far superior to the 20th century big_box_with_lots_of_parts type of power supply.  I use them to refurbish any electronic equipment that has 7805 (780x) or LM317 linear regulators.

Last Edited: Wed. Sep 23, 2015 - 02:02 AM
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DP30V3A Constant Voltage and Current Step-down Programmable Power Supply Module

 

http://www.aliexpress.com/item/D...

 

When I use 10W led (900mA) with 10mA I can see some blinking on the led so the current is not stable but 40mA I can't see any blinking.  This is cheap and easy way to make your lab power supply.

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About 8 times less expensive than :

Linear Technology

DC2132A - 24V 3A Constant Voltage, Constant Current Bench Supply Featuring LT3081, LT8612, LT3092

May 22nd 2014

http://www.linear.com/solutions/5086

"Dare to be naïve." - Buckminster Fuller