Simple 2mA 9V circuit

[fatetrader]

If I flip the LM334 and have ammeter connected do anode it works... strange I knew about the LM that it is connected backwards but what can I do

[Pauldf]

Can you place a 3.3k resistor across the anode and cathode just for test purposes?

[fatetrader]

I have tried what you said, with your design and still didn't work. Question, since the other design by the guy from youtube I currently use is working, is it good for use?

when I have it setup this way as on my second image, it works good, ammeter shows values but when I check the values with DMM while everything is on ammeter shows zeroes for the time when I do testing with DMM, right after I disconnect DMM from the circuit ammeter comes back displaying values. is this normal?

Also DMM shows 3.5 and ammeter 3.25, there is slight discrepancy, which one is the right one?

[Pauldf]

I'm not sure if it is any good or not, having the current regulator connected backwards may mean the only limiting factor is the current from the battery.
In your second image the ammeter is connected across the anode and cathode hence very little or no current will flow between the anode and cathode.
Where are you connecting the DMM? What range have you set it to.
It is anyones guess as to which one is reading correctly, 0.25mA isn't a lot of current!

[fatetrader]

Have a look at the video I made so you can see how everything is connected and that when lm334 is wrong way around it works (I didn't actually recorded flipping it). at the end you can see also when I hold the wires from anode and cathode dmm shows reading and but at the same time ammeter shows only zeroes only when I release wires ammeter shows reading.

http://www.youtube.com/watch?v=NcfQGJqR ... e=youtu.be

[Pauldf]

Not sure what is going on with the lm chip but it appears to be working.
As I said before, your fixed ammeter is currently connected across the load. It needs to be connected in series with the load.
When you are connecting the DMM you are connecting it in parallel with the ammeter, the current of each path being relative to the resistance of each device. The DMM appears to have a much lower resistance hence almost all he current is flowing via that.
You need to have ammeters connected in series for both to work at the same time

[fatetrader]

Ok so lets leave this Lm334 as it is because it works, how should I connect my ammeter? I leave black and read as they are, and where do I plug in the green wire?

[Pauldf]

Try connecting the green wire as the only wire to the cathode. When you put your DMM across anode and cathode both the readings ought to be the same.

[fatetrader]

I have tried connecting to cathode and nothing, it shows zeroes only.

[Pauldf]

Can you remove the ammeter from the circuit and measure the resistance between red and green, then red and black?