baby_1
Advanced Member level 1
i created a circuit that can amplify a wave with 20mV amplitude.
i use bc639 transistor with the ic=1ma
i calculate:
VCE=6.25
RC=5750
RE=570
RB to ground=20K
RB to VCC=102K
VCC=12
Min beta=40
max beta=160
so average is beta=100
i see my input has been amplify with Gain=10 but when i add a bypass capacitor on RE resistor my output has disturbation,Why? how can solve this problem?
i use bc639 transistor with the ic=1ma
i calculate:
VCE=6.25
RC=5750
RE=570
RB to ground=20K
RB to VCC=102K
VCC=12
Min beta=40
max beta=160
so average is beta=100
i see my input has been amplify with Gain=10 but when i add a bypass capacitor on RE resistor my output has disturbation,Why? how can solve this problem?