HELLO everyone,
I am having a LCD display which shows various data on it... One channel on the LCD is used to increase/decrease the contrast of the light.. And to increase/decrease this, I have:
1. Analog Potentiometer --> turning knob
2. Digital Potentiometer --> Using +/- button on the front panels
The analog potentiometer works very well, but the digital potentiometer does not work keeping the rest of circuit same.. Initially I thought that
the AC source would be producing some noise in the circuit, so introduced a filter.. So, the power section of the circuit is fine...
However, when I use a digital pot, the LCD behaves crazy.. I do not have a circuit diagram yet... But will post one soon.. I think the problem is with a transistor 2N2906 which is used as a switching transistor. ( The transistor has -22V as VDD)
Can anyone please suggest me any better switching transistor??
Please be sarcastic if you do not understand my problem
I am having a LCD display which shows various data on it... One channel on the LCD is used to increase/decrease the contrast of the light.. And to increase/decrease this, I have:
1. Analog Potentiometer --> turning knob
2. Digital Potentiometer --> Using +/- button on the front panels
The analog potentiometer works very well, but the digital potentiometer does not work keeping the rest of circuit same.. Initially I thought that
the AC source would be producing some noise in the circuit, so introduced a filter.. So, the power section of the circuit is fine...
However, when I use a digital pot, the LCD behaves crazy.. I do not have a circuit diagram yet... But will post one soon.. I think the problem is with a transistor 2N2906 which is used as a switching transistor. ( The transistor has -22V as VDD)
Can anyone please suggest me any better switching transistor??
Please be sarcastic if you do not understand my problem