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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 Nyla

  1. N

    Modulated current limiting circuit

    I understand, I didn't mean for the circuit to be actually designed by anyone though I see now it did sound that way. As for the components, what I'm not sure of is the pass transistor P (the appnote doesnt mention any examples I could use), whether to use a DAC or digipot (the appnote uses...
  2. N

    Modulated current limiting circuit

    Ok here's a compromise. To make the circuit useful to people who require the very fast update rate, it should accept an analog signal between 0 and 5v (this is how another driver works). It can then be interfaced to a soundcard DAC which should provide them with the required speed. For less...
  3. N

    Modulated current limiting circuit

    Yeah on second thought PWM doesn't seem very suitable. I'm not entirely sure how to apply the appnote to a circuit that would work for me though...
  4. N

    Modulated current limiting circuit

    All the diodes I've seen do have a feedback photodiode but this is never used as we don't really care. Imho it can be omitted from the circuit.
  5. N

    Modulated current limiting circuit

    The load is a laser diode. Different types use between 2.5 and 4.5v, it would be nice if the circuit could work with any type. Supply voltages would be regulated by a seperate lm317 regulator so they can be adjusted accordingly,t I'm only worried about limiting the current. The settling time...
  6. N

    Modulated current limiting circuit

    I dont exactly understand what you mean, where would I put this transistor? The circuit I've been working with is this one: **broken link removed** Where the current supplied to the load is 1.25/R. Do you mean I put the 2n3055 in the place of the resistor? It's for driving a laser diode btw :)
  7. N

    Modulated current limiting circuit

    Hi all, I'm looking for a way to make a circuit that will limit the output current between around 20 and 500mA (200mA will do if it really can't be done). It could be controlled either with a serial interface, a pwm signal, digital parallel signal, analog signal, etc, as long as it's...
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