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  1. vicious5id

    Constant current source for a low Ohm load

    That's a shop?!
  2. vicious5id

    Current-dropping current source! I don't get it! Please help!

    You want me to replace resistor R3, with a voltage regulator?, but the thing is these babies have minimum inputs and outputs that exceed 1 V, and 0 to 1 V is all I need at VIN+ in my circuit!
  3. vicious5id

    Current-dropping current source! I don't get it! Please help!

    Oh damn I forgot I posted something similar to this already in this forum, sorry, any moderator want to chuck this topic back into my old one? Hmm, OK, how would I go about regulating VIN+? I thought about using a diode, or a Zener diode, in like a shunt configuration, or would it be better for...
  4. vicious5id

    Constant current source for a low Ohm load

    indulis, R1 and R5 are present to take some voltage away from the transistor so it dissipates as little power as possible, with the setup shown it only churns out ~400 mW. The application is basically that I have a ~20 Ohm load resistor which I expect to change in value in accordance with its...
  5. vicious5id

    Constant current source for a low Ohm load

    Yes that's the whole point! The 20 Ohm load I've got begins to vary, but I don't want the current within it to change, it must stay constant. I would be very grateful if you could let me see that schematic for a variable constant current source. ^ That's another version of the circuit I...
  6. vicious5id

    Current-dropping current source! I don't get it! Please help!

    Greets everyone, I am not sure if this is the right place to post this in the forum, but I have a problem with a circuit that I designed at the implementation stage. ^ That's the circuit that I have designed. The purpose of it is to behave as a current source that supplies a range of current...
  7. vicious5id

    Led display Digital Voltmeter question

    So you think that I should use circuit (a)? Which circuit will give me the smallest amount of loss? I understand that you need to measure the voltage across a small resistance to use a digital ammeter.
  8. vicious5id

    Led display Digital Voltmeter question

    Hey wassup people! Man tonnes of work has gone into this circuit, I'm very impressed with all these radical ideas about thermometers and ammeter adaptations! Who'd have thought an IC first manufactured in 1977 (7106, 7107 is the sister IC) would still be so very useful today! Anyway I just...
  9. vicious5id

    Constant current source for a low Ohm load

    Well I guess a ~0.01 mA drift would be very nice. The idea of a current mirror looks interesting, I'll check it out later.
  10. vicious5id

    Constant current source for a low Ohm load

    Erm, thanks for that indulis, but I think I'm going to need a few other values and device numbers to go with that. Is that a precision constant current source circuit? Edit: I decided to simulate the circuit using SIMetrix, with a few components: http://vicious5id.zerodollars.com/eL-iSrc.GIF...
  11. vicious5id

    Constant current source for a low Ohm load

    Resistor R1 in the schematic IS the load. Sorry I forgot to mention that! It's a 20 Ohm load, however I've tried to change it for 15 and 25 Ohm loads (changed R1 value) and I still get a constant 0 to 120mA range.
  12. vicious5id

    Constant current source for a low Ohm load

    How would I go about creating a constant current source to supply a 20 Ohm load? I want the current to be variable from 0 to 120 mA. So I need a circuit which supplies a constant current to a 20 Ohm load, in the range of 0 to 120 mA. ^ That is a circuit that I have designed already, however...
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