AJB2K3 Posted June 26, 2004 Report Share Posted June 26, 2004 I need to make a 12>7.5V @3A psu for my PS1 but it needs to be stabalised can anyone help?(Yes its an outdated consol for an outdated car) Quote Link to comment Share on other sites More sharing options...
ante Posted June 26, 2004 Report Share Posted June 26, 2004 AJB2K3,The LM 338 will be one possible way to go!http://www1.jaycar.com.au/images_uploaded/LM138.PDFAnte ::) Quote Link to comment Share on other sites More sharing options...
MP Posted June 26, 2004 Report Share Posted June 26, 2004 AJB2K3,Ante's suggestion is a very good one and should work fine. If that part is not available to you, here is a converter circuit that is close. This is only a start and you will have to make some changes. In fact it is a basic building block for a simple step down regulator that can have many purposes if you make the base voltage variable with a pot.Change the zener diode to allow the voltage you want. R1 determines the base current. V/R=I. The transistor should be one which will allow the current you require. I cannot find a data sheet on the ECG184, but a post on another site gave the description: The ECG184 Power Transistor is a bipolar silicon NPN 4 Amp, 40 Watt power transistor. Another website stated that the ECG185 is rated at twice the power rating. Personally, I would recommend finding transistors that are very common to your geographical area.Hope this is somewhat helpful.MP Quote Link to comment Share on other sites More sharing options...
vainajala Posted June 26, 2004 Report Share Posted June 26, 2004 AJB2K3,I agree also to Ante's suggestion. it's a simple and powerful circuit, and with good heatsink it doesn't need any pass transistors for this application. There's many circuit examples in the datasheet of LM338, I suggest you to take a closer look... :) Quote Link to comment Share on other sites More sharing options...
AJB2K3 Posted July 2, 2004 Author Report Share Posted July 2, 2004 Thanks for the help. I was worried about under voltage protection but im sure it wont fall below 11V. All i got in electronics stors is maplins and they dont stock that chip but thanks anyway. Quote Link to comment Share on other sites More sharing options...
MP Posted July 3, 2004 Report Share Posted July 3, 2004 AJB, does this help or do you still need other ideas on how to accomplish this? In electronics, there are always many ways to accomplish the same goal.MP Quote Link to comment Share on other sites More sharing options...
AJB2K3 Posted July 3, 2004 Author Report Share Posted July 3, 2004 Actually its been very helpful, but im just trying to source sutiple parts. Quote Link to comment Share on other sites More sharing options...
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