Maybe now, we can talk more about heat 
2 Likes
Step by step...
You can start monitoring the heat. But it's missing the black insulator between pcb and dome.
I don't have all the components yet..
Did you guys notice that on both BC337/2N2222 Emmiter-Base voltage is 5v? Is that a problem?
No, that's the reverse voltage it can safely withstand and not a problem with your application.
Show us that you start getting in to it... 
Make the setup for 3mm 20mA LEDs, 3 in series with 100ohm 1/4W resistor powered by 5V supply.
Measure voltage across whole setup, across resistor, across one LED and calculate current draw.
1 Like
Tnx. Are you rejected BC547 because I told that is current 100mA, or?
I found some inconsistencies in different datasheet.
One says for BC547 Collector Current 100mA, and another 500mA.
That is serious stuff! How is that possible?
Then where to look and what is true?
Deal
That's good question. There are so many manufacturers in history for "BC547" and even more vendors, so it's a wild west. You might even find datasheet from one specific manufacturer from year X stating 100 and from year Y stating 500. Aliexpress vendor can state it even 5000...
1 Like
And for BC337/2N2222 not? They not popular like that, or?
I'm asking myself what @EmilyJane think of that datasheets too?
Where did you find that 5v? 
I have many USB chargers in that range? But they don't have connectors or wires which I can put on breadboard.
The data sheet with the 500 mA for a BC547 is a mystery to me. The BC537 and the 2N2222 on the other hand do have collector currents that are in that range. Maybe you just got them mixed up. Post a link to a data sheet with 500 mA for a BC547 and we can take a look.
Fairchild has made 500mA version at some point in history.
If that stops you, you are in big trouble with your camera.. 
1 Like
I have lot of old USB cables. I will try.
Ancient history. Show where you can actually buy one with those specs.
It looks like at one time in the past Fairchild made one. Fairchild Semi doesn't exist any more as a company OnSemi having taken over the business. I'm through talking about this part. Buy whatever suits you.
Don't be mad. I'm just checking because I saw that my current correspond that on the link.
But it seems that individual one is not a regular production process..
I will buy then BC337. Don't worry.
EDIT:(20:12h)
I see that @EmilyJane found a new transistor- "BC537" (if not mistake). That is third one which can fit?
that was a typo, ignore it.
1 Like
Hi,
@danyCro
Just a tip, R3 you have as R100, if it is 100 Ohm, then use 100R, the R designates the decimal point.
R100 == 0.100 Ohms.
Tom... 
OMG Really? 
Someone above already told me similar, and I was no idea why is telling me that Thanks. I will watch out next time.
So what's the calculated current draw?
1 Like