Nox
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- Joined
- Apr 18, 2013
- Messages
- 5
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Hello
I'm new to the forum so i hope that I'm not doing something wrong. But here's my question. I am building a laser setup with an audio control. The laser has to be turned on and off with sound coming from my audio jack on my PC( max. 20 000 Hz). I understand electronics pretty well but this project brought me to my limits. In the end i have made a Darlington transistor configurations where the first transistor is a BC107 and his base is connected via a 100 ohm resistor to the sound signal. The second transistor is a power transistor i used a 2N3055 ( I know it is too much power but doesn't matter) and everything is connected an shown on the picture. I am using a cheap 5 mW laser, something like this:
http://i.ebayimg.com/t/5mW-532nm-Powerful-Astronomy-Green-Beam-Light-Laser-Pointer-Pen-Class-3A-NEW-/00/s/NTAwWDUwMA==/$T2eC16hHJGQE9noMcT!ZBQM,UUgGY!~~60_12.JPG
(J3- signal input; J1,J2- laser connector)
And i tried another circuit that i made.
(J1- audio signal input; J2,J3- laser connector)
The same problem occurred with both circuits. When I connect them to the audio signal nothing is happening and when i connect them to 3,3 V the laser works.
What am i doing wrong? :cryyy: Please help me.
Nox.
I'm new to the forum so i hope that I'm not doing something wrong. But here's my question. I am building a laser setup with an audio control. The laser has to be turned on and off with sound coming from my audio jack on my PC( max. 20 000 Hz). I understand electronics pretty well but this project brought me to my limits. In the end i have made a Darlington transistor configurations where the first transistor is a BC107 and his base is connected via a 100 ohm resistor to the sound signal. The second transistor is a power transistor i used a 2N3055 ( I know it is too much power but doesn't matter) and everything is connected an shown on the picture. I am using a cheap 5 mW laser, something like this:
http://i.ebayimg.com/t/5mW-532nm-Powerful-Astronomy-Green-Beam-Light-Laser-Pointer-Pen-Class-3A-NEW-/00/s/NTAwWDUwMA==/$T2eC16hHJGQE9noMcT!ZBQM,UUgGY!~~60_12.JPG
(J3- signal input; J1,J2- laser connector)
And i tried another circuit that i made.
(J1- audio signal input; J2,J3- laser connector)
The same problem occurred with both circuits. When I connect them to the audio signal nothing is happening and when i connect them to 3,3 V the laser works.
What am i doing wrong? :cryyy: Please help me.
Nox.
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