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Recent content by edmundopt

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    Mosfet reverse voltage protection

    hello I'm searcing for Mosfet to use as reverse voltage protection, without extra components, the voltage is of 12volts and the maximum current is of 7amps. I have found the FQPF47P06 and I'm concerned about the value of Gate-Source voltage, in the datasheet it is only mentioned in the...
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    L297 L6203 sugestions

    Hello This is my first attempt to make my own stepper board, with opto inputs, and only one voltage source ,a 14.6Amp meanwell regulated power supply I have other boards, much more basic but all working about 24volts, I'm trying to go up to 44v with this one I would like suggestions about...
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    What's the purpose of sense capacitor in L297?

    Hello I have build a simple L297 L298 board, but now is time to improve it! Some schematics have capacitor and resistor at the sense inputs of the L297, in the L297 datasheet and in the AN470 there's no mention of them, the following schematic found here : High current bipolar stepper motor...
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    [SOLVED] How can NPN transistor be used as PNP ?

    Re: NPN used as PNP math Yes, in Portugal, the only one I can buy is the LM2575T-ADJ, can't find the HV version, and it has two problems that I can't solve(maybe more studying): 1) Supply voltage: 40volts,45v maximum , so it requires some stable way of 44v->40v 2) I still don't know how to...
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    [SOLVED] How can NPN transistor be used as PNP ?

    Re: NPN used as PNP math maybe it's 1200(1k2) resistor, and not the 12000(12k) .. Anyway, the zener will need to have a Izt > 23mA so probably 2watts zener, and the resistor will need to be 1watt, and the TIP41C will blow :) , what a great schematic :grin: I'm using the following circuit for...
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    [SOLVED] How can NPN transistor be used as PNP ?

    Re: NPN used as PNP math Thank you for the reply The lamp is just used as a load example. I've read a lot about calculations for transistors saturation(as switches) but did not know this "emitter follower", any good tutorial? Is the Dissipation formula P = V * I correct for this operating...
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    [SOLVED] How can NPN transistor be used as PNP ?

    Hello all this is my first post, hopefully in the correct section! I've finish reading the book "Electronics for dummies", so only basic basic knowledge I've visited this site and found this schematic The curious part about it is this : I've simulate the circuit using Proteus...
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