Aug 10, 2007 #1 R rampat Member level 4 Joined Jun 27, 2007 Messages 69 Helped 4 Reputation 8 Reaction score 1 Trophy points 1,288 Location bangalore Activity points 1,756 Can u plz explain the following circuit..how this ckt acts for the two i/p signals separately and wen both i/p are present..?
Can u plz explain the following circuit..how this ckt acts for the two i/p signals separately and wen both i/p are present..?
Aug 16, 2007 #2 plusminus Full Member level 1 Joined Jul 27, 2007 Messages 96 Helped 15 Reputation 30 Reaction score 3 Trophy points 1,288 Location the Netherlands Activity points 1,804 The circuit around U2 acts like a low pass filter. V1+V2 are summed to U2. V1 acts like a bandpass filter. So V1 only is V1 with a DC attenuation of 1/5 (R4/(R6+R3) + band pass + low pass So V2 only is V2 with a DC amplification of 2 (R4/R7) + low pass Total is V1*0.8 +V2*2 . (for DC) For AC : ((V1*0.8*bandpass)+V2)*2*low pass)
The circuit around U2 acts like a low pass filter. V1+V2 are summed to U2. V1 acts like a bandpass filter. So V1 only is V1 with a DC attenuation of 1/5 (R4/(R6+R3) + band pass + low pass So V2 only is V2 with a DC amplification of 2 (R4/R7) + low pass Total is V1*0.8 +V2*2 . (for DC) For AC : ((V1*0.8*bandpass)+V2)*2*low pass)