You state the you want to run 96 LEDs is that a string of LEDs in series? If it is then you have other problems with a 20 mA constant current. PubChem CID: Chemical Names: ; N,N-Bis(2-chloroethyl) allylamine; ALLYLAMINE, N,N-BIS(2-CHLOROETHYL)-; TL ; BRN ; . tl has been an eBay member since Jun and has % positive feedback. Check out tl’s full profile.
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So your circuit looks like the middle one, shown above. Just random remarks here and there plus 7. So you’d need to have capacitance to reduce the ripple. Are you serious about 69 LEDs in series? Led currents do not need to be super accurate. Sign up using Facebook. Each string of LEDs is now only 12 devices instead of 14, but the voltage Gl341 difference for the string simply appears across the 2N Consider that if you have 96 LEDs with a Vf of 2.
Now, this gets back to the question of how you intend to operate it eventually. Note that you could put more LEDs in a string and reduce the number of strings, but you’d have to increase the Vce of the transistor.
Time to show a complete schematic for all three versions you are making. Papou I get it that you don’t have a fixed DC reference. I am trying to get this well known circuit [. I suspected over-voltage peaks and that current limiting is something to try.
Another concern is that rather much less that 19mA flows in RCL. The 2N is only 40 V Vce.
But I think you are to341 testing this, for now, by shorting both of them. Sign up or log in Sign up using Google. If I had to guess, your approach was just random shots without design fl341 in all three cases you missed the target entirely and are wondering how it is supposed to work.
You state the you want to run 96 LEDs So I think this tells you one important fact — the TL is effectively “out of the circuit. If you want to run 96 LEDs as a string it might be done as below: Working out the resistors for the TL is very simple, consider this simplification from Figure 39 of the datasheet.
I think 1 a spike is unlikely the cause of failure here; and 2 a current limiter as suggested is unlikely the solution. Calculating R1 is uneasy, so I made the following tests.
Let’s start with an overview schematic for the two simpler constant current topologies for the TL I’m using an SCR symbol for the TL here lt341 the left side, below:. But the new measure is no less surprising: So Vce would increase by 4. The TL is featured in www.
N,N-Bis(2-chloroethyl)propenamine | C7H13Cl2N – PubChem
Current limit is applied to stop them blowing up.