The Shop > Electronics & IC Programing
6A PSU using L200
Bluechip:
--- Quote from: Stilldrillin on July 30, 2010, 12:34:54 PM ---
--- Quote from: Bluechip on July 30, 2010, 10:49:29 AM ---
EDIT .. BTW, your pic seems to be minus the little triangle thingy that makes it whizz round ... :thumbup: any chance ?
--- End quote ---
I`m confused again Dave....... ::)
Why would the pic need to whizz round? :scratch:
If you mean the crank throw. It`s still there......... It all gets a little blurred at a dizzy 400+ rpm! :)
David D
--- End quote ---
Those funny pics. with 'YouTube' in the botom RH corner, and a grey rectangle with a black triangle in the centre ...
Sort of shorter version of the Saturday Afternoon 'Tuppenny Rush' ..
No Candy Floss tho' :scratch:
Dave BC
Bluechip:
--- Quote from: John Swift on July 30, 2010, 12:15:44 PM ---Yes your right I've saved a smaller picture
the first picture did not look that big when I saved :hammer:
would one mje2955 ( plastic pnp) not of been ok ? or even a 2N3055 ( metal npn )
I've not used the L 200 regulator my self - thats why I am following your project
waiting for your next instalment
--- End quote ---
John
You could use a ( or more ) MJE2955, but not a 2N3055. Needs to be pnp, not npn.
On this PSU input volts is about 10V, lowest output Volts is 2.7-ish. This gives about 7.3 volts across each transistor x ( 3A )... ie some 22W.
With one it's 44W ... I used two MJ2955's to give them an easier time .. I got quite a few anyway. Will also put a box fan on it.
If you download the L200 .pdf and also the L200 Application Notes ( more circuits ), from ST.com it's all in there .. :thumbup:
Would post the .pdf of the Eagle Schematic but I don't know how to :scratch:
Don't even know how to post a image ... tried but failed .... :hammer:
Dave BC
Stilldrillin:
--- Quote from: Bluechip on July 30, 2010, 12:56:05 PM ---
Those funny pics. with 'YouTube' in the botom RH corner, and a grey rectangle with a black triangle in the centre ...
Sort of shorter version of the Saturday Afternoon 'Tuppenny Rush' ..
No Candy Floss tho' :scratch:
Dave BC
--- End quote ---
Oh..... Them things! :doh:
I get bored wi em, after a few seconds of watching an engine whizzing. So, I only take filums of new stock. ::)
Drive a candy floss machine! :bugeye: Oh yeah..... That's a great idea! :D
Anyhow....... I think we should return to topic. :thumbup:
Whatever it was ....... :scratch:
David D
Bluechip:
Topic ???? Wot topic ... Choccy bar ??
Nowt to do wi me anyway :lol: :lol:
Gone
John Swift:
Hi Dave BC ,
I see you had two good reasons for using the MJE2955's
first you have them all ready and the pin out of the IC makes it easier to use a pnp transistors
you would need to use a pnp transistor with a npn power transistor like the 2N3055 to form a quasi -pnp transistor
like they used to do in audio amplifiers when there was not as many PNP power transistors
the first IC regulator I used was a uA723 , ideal for using with NPN transistors
Its a bit old ( like me ) but because the reference voltage came out of one of the pins and both op amp/ error amplifier inputs , it was easy to turn the output down to zero
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