BJT temperature compensation

208

01:11:19

On the right is the circuit at room temperature and on the left is the circuit with the temperature increased so as to double the gain of the transistors, but as can be seen the current through the current meters isn’t doubled but only slightly increased.

published 5 years ago

Igor

5 years ago

Nice demo. It would be good to add a load.

Robert_Kidd

5 years ago

Hi Igor, while we have your attention, is the DAC coming back? Also, long-standing and annoying ‘feature’ on Apple devices - when you scroll through circuits screen suddenly ‘bounces’ and you have to waste time trying to find out where you’d got to. This happens repeatedly and is really frustrating. Any chance you can look at these issues?

Robert_Kidd

5 years ago

@jason9, forgive me for high jacking your post on this occasion.

PrathikP

5 years ago

@robert, I have opened a new thread for that https://everycircuit.com/circuit/5181979509915648

PrathikP

5 years ago

@jason, you say that the circuit is temperature compensated. A temperature compensated circuit shouldn't show performance variations with the temperature; your circuit actually shows the effect of temperature changes on a BJT and not how you can compensate for it.

Igor

5 years ago

@Robert_Kidd, yes, the DAC is coming back, likely this or next week.

jason9

5 years ago

@PrathikP I may be mistaken, but without temperature compensation I believe the current should double since I doubled the gain to simulate higher temperatures. Also, I didn’t have much time last night so I didn’t fine tune it to compensate properly. I’ll do that when I have time.

jason9

5 years ago

@PrathikP the link isn’t taking me to a circuit. I put “5181979509915648” in the search bar and nothing turns up. Did one of us copy the number incorrectly or was the circuit removed?

PrathikP

5 years ago

It was removed, as it is essentially spam

jason9

5 years ago

@PrathikP ah, I see.

jason9

5 years ago

@Igor, any chance you can open source EC, preferably by hosting it on GitHub? It’d be nice to see how it works on the inside and others could fork it and add their own features since you’re adding new features so slowly.

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