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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by Nick D

  1. N

    Dynamic aspects of transistors

    Hello all, I'm connecting an IR2111 gate drive to IRF830 MOSFETS for a DC - AC power converter. Now, for the resistor Rg(off), ie the negative rail mosfet, I've come across some formulas that include a transistor capacitance 'Cres(off)'. I can't find this value on the datasheet. What I have...
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    CRO Balanced Preamplifier

    Ok Understood, thanx. I need to pump 2 Vpp into 100 Ohms, around 40mW. This is one of the requirements. It's a fairly pointless task, just designed to explore the characteristics of amplifiers in general. Do you still think 10mA is excessive? I also need to make a few adjustments to the...
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    CRO Balanced Preamplifier

    Thumbnails Thanx for the input Nigel. With respect to the thumbnail, when I previewed it, I found that by expanding it (ie the enlargement tab on the bottom right of the screen) the circuit becomes as bright as day. Could this just be on my end? Regarding the resistances, I'm designing...
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    CRO Balanced Preamplifier

    Cicuit diagram to CRO Preamp Ron, I've posted a schematic of what i intend to use. After adding the second cascode stage, i seem to have lost my gain in the first. I'm using Multisim7 to simulate. The collector resistances in the first were originally 175 Ohm, but i have been playin around...
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    CRO Balanced Preamplifier

    att: Ron H and Analog My apologies gentlemen, I'm not usually available over the weekend because I work in a bar. In regards to the schematic, I only have a model of the cascode pair, and have been playing around with different feedback pairs, but I'de like to avoid using pnp's. I'm...
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    CRO Balanced Preamplifier

    CRO Preamp Thanks dude :), I was toying with the idea of using two cascodes, but wouldn't I be able to just use one and amp it up to a gain of 100, followed by the emitter follower? I've been told by a fellow student that it's better to have most of the gain in the first stage, so that you...
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    CRO Balanced Preamplifier

    Gday folks! I was looking for some help on the net and came accross this forum, and am now a new member. Anyways, I'm studying engineering at uni and we have a project where we must build a preamplifier (balanced) to add high sensitivity ranges to a CRO. The input impedence must be >1k and must...
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