Led controled with collector loosed transistor

Other Hardware Device Hacking
1

Hi there,
I have to fix lamps for microscope. Te issue is that they do not shine all they should, so I opened it to have a look and I am a litttle puzzled.
The energy supply is 5V, the lamp is 3V, and there is a potensiometer to choose the intensity of illumination.

Here after the circuit and a photo of the thing. I had never seen a transistor used with a loose collector. It is a 13005 transistor. Does someone knows what it is for, and how could I modifiate the circuit so the lamp shines brighter ?


2

No images. Following the hidden links gets me to a login page.

In that particular transistor the collector is also connected to the tab. That may be the connection you're looking for.

3

wvmarle:
No images. Following the hidden links gets me to a login page.

Goddamit !
Id post the share link of my google drive below, but it wont display the images in the post.
https://drive.google.com/open?id=11J6WfjuzGkkrJ8-_rFCkCyMK-Co_0Arm

https://drive.google.com/open?id=1u--krOlto0Ziqe6BGj6vTDUcZB0tOV7B

wvmarle:
In that particular transistor the collector is also connected to the tab. That may be the connection you're looking for.

No, already checked, the tab is just screwed to the plastic box. Thanks for the answer, hope that with the images you can help me more :wink:

4

You best simply attach images to your post. Explained in detail here.

One image shows a blue and yellow wire go into a black sleeve towards the transistor. Can't see where they connect. Possibly one of them connects to the tab of the transistor underneath.

5

If you still need help, i’m sure there are people that want to look at your schematic.
Follow the suggestions above, and you’ll have some ideas within 24 hours.

6

Clearly the yellow wire is just screwed down under the transistor. Look at the heat shrink on the blue wire. The yellow wire does not connect here.

Seriously, use your eyes :slight_smile:

// Per.