# Digital Bandpass Filter Circuit Diagram

Digital Bandpass Filter Circuit Diagram This filter lets digital frequencies within its passband to pass though with the help of two monoflops. A bandpass filter has two definite cut-off frequencies: fmax and fmin. The bandwidth b is fmax-fmin while the center frequency is fmin+b/2 or fmax-b/2. The upper cut-off frequency fmax is determined by the pulse length (t1) of the monoflop M1.
 Digital Bandpass Filter Circuit Diagram

### Digital Bandpass Filter Circuit Diagram

This filter lets digital frequencies within its passband to pass though with the help of two monoflops. A bandpass filter has two definite cut-off frequencies: fmax and fmin.

The bandwidth b is fmax-fmin while the center frequency is fmin+b/2 or fmax-b/2.
The upper cut-off frequency fmax is determined by the pulse length (t1) of the monoflop M1.

t 1 = Tmin ( b/ fmax)
The lower cut-off frequency (fmin) comes from the sum of the pulse length of the monoflop 1 and monoflop 2.

fmin = 1/ (t1+t2)

The pulse length (t) is determined by RC components P2/C2 and P1/C3 and can be found mathematically by: The value of P can be chosen from 5 ohm up to 50K.

t = 0.32*C*(P+700)