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EEVblog #72 - Let_s Design a Product ( uCurrent )

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Tioleco:
Have some questions about the uCurrent:


1 - Changing the supply voltage is necessary to change the value of some component?

2 - Can I use discrete components instead of SMD (for capacitors and resistors)?

3 - Using linear DC power supply with common transformer , there would be a noise problem that would hamper the performance of the circuit?

4 - If this problem ( burden voltage ) is already well known , because the manufacturers no longer incorporate a circuit like this in their multimeters?

sacherjj:

--- Quote ---1 - Changing the supply voltage is necessary to change the value of some component?

--- End quote ---

Yes.  At the minimum, the LED current limit resistor and all the low voltage detection.


--- Quote ---2 - Can I use discrete components instead of SMD (for capacitors and resistors)?

--- End quote ---

Yes, but if you are doing SMD for the ICs (which is the only option) then resistors and caps aren't too hard in 0805 packages.


--- Quote ---3 - Using linear DC power supply with common transformer , there would be a noise problem that would hamper the performance of the circuit?

--- End quote ---

Absolutely.  It will run for 10 hours with a battery, why do you need to use AC power?  The noise on a circuit this sensitive will most certainly be a problem unless you filter very well.


--- Quote ---4 - If this problem ( burden voltage ) is already well known , because the manufacturers no longer incorporate a circuit like this in their multimeters?

--- End quote ---

It is impossible to have this circuit accurate and protected. 

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