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| Elektro-Automatik EA-3048B Power Supply Teardown |
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| armandas:
As the title says, this is a teardown of the EA-3048B power supply. There is not much info on the internet about these, so I thought I'd share some pictures and comments. This is a so-called "universal" power supply. It has two outputs: DC and AC. The DC is not regulated, so you either get rectified or smoothed (using a 4700uF cap) output. Not much else to say, I guess, so let's look at what's inside. Front view. Overview of the insides. The voltage is controlled using a variable transformer (variac). Display board. Binding posts. Made in China.. There are some more pictures in the album. These PSUs are sold by Farnell. |
| saturation:
Thanks, nice tear down and clear photos. What does one use variable VAC at these voltages for? The DC output appears to be just full wave bridge rectification with a smoothing capacitor? |
| armandas:
--- Quote from: saturation on July 07, 2011, 12:53:02 pm ---Thanks, nice tear down and clear photos. What does one use variable VAC at these voltages for? The DC output appears to be just full wave bridge rectification with a smoothing capacitor? --- End quote --- In the description, it says that these supplies are good for school labs and such, so I assume this supply can be used to safely reduce mains voltage (instead of using a transformer). You are right about the DC output. The smoothing capacitor can be switched on and off. |
| Frangible:
A nice old school unregulated DC power supply. Good for testing regulators and for electro-chemical experiments! |
| Ronnie:
--- Quote from: armandas on July 07, 2011, 09:28:45 am ---Made in China.. --- End quote --- Looks like the build quality is very good. 8) |
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