Hello,
Yesterday I posted a post called "Noise from 556". I Thought it would be better off if I re-posted a detailed version of my problem... Here it is.
If you open my attachment, you will see my schematic. Some fellows where concerned that the way I connected my LCD was the cause of the flickering. I must say that the LCD has working perfectly for about 6 months without any flickering problems. It is only when I attach wire A (Please view schametic) that the flickering starts. In reality the 556 timer has nothing to do with screen refreshes or any timming for the LCD. The LCD is completely controlled by the MCU.
I was wondering if I should use some other transistor instead of the 2N2222. Like I said, I am not that good with semies. I sort of left this stuff along time ago, and would appreciate some ideas on how I could modify the 2N2222 driver circuit. The 2N2222 will be intended to drive an IR LED. But weather I plug the LED or not, I still get flickering on the LCD.
PS. The timer's specs says that the current version of the 556 can be powered from 2 to 18 VDC!
All help appreciated.
With greatest regards
Robby
Yesterday I posted a post called "Noise from 556". I Thought it would be better off if I re-posted a detailed version of my problem... Here it is.
If you open my attachment, you will see my schematic. Some fellows where concerned that the way I connected my LCD was the cause of the flickering. I must say that the LCD has working perfectly for about 6 months without any flickering problems. It is only when I attach wire A (Please view schametic) that the flickering starts. In reality the 556 timer has nothing to do with screen refreshes or any timming for the LCD. The LCD is completely controlled by the MCU.
I was wondering if I should use some other transistor instead of the 2N2222. Like I said, I am not that good with semies. I sort of left this stuff along time ago, and would appreciate some ideas on how I could modify the 2N2222 driver circuit. The 2N2222 will be intended to drive an IR LED. But weather I plug the LED or not, I still get flickering on the LCD.
PS. The timer's specs says that the current version of the 556 can be powered from 2 to 18 VDC!
All help appreciated.
With greatest regards
Robby
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