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| 6A PSU using L200 |
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| 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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