Hi,

I am planning to build preamp and 4 way active filter for my two lm3886 and one lm1876 amplifiers.

here are the circuits for lowpass ,highpass and preamp.please let me know if the circuit is fine or it need some changes.

preamp will be added after active filter, the reason is, i want to adjust different gains for different drivers.

i have not planed the crossover frequencies, but have prepared the chart for different frequencies.

102.31Hz 11k 0.1uf

150.05Hz 7.5k 0.1uf

200.96Hz 5.6k 0.1uf

341.03Hz 3.3k 0.1uf

416.81Hz 2.7k 0.1uf

511.54Hz 2.2k 0.1uf

750.26Hz 1.5k 0.1uf

937.83Hz 1.2k 0.1uf

1125.4Hz 1k 0.1uf

3410.3Hz 3.3k 0.01uf

5115.4Hz 2.2k 0.01uf

Thanks

Aniruddha

Preamp Circuit

I am planning to build preamp and 4 way active filter for my two lm3886 and one lm1876 amplifiers.

here are the circuits for lowpass ,highpass and preamp.please let me know if the circuit is fine or it need some changes.

preamp will be added after active filter, the reason is, i want to adjust different gains for different drivers.

i have not planed the crossover frequencies, but have prepared the chart for different frequencies.

102.31Hz 11k 0.1uf

150.05Hz 7.5k 0.1uf

200.96Hz 5.6k 0.1uf

341.03Hz 3.3k 0.1uf

416.81Hz 2.7k 0.1uf

511.54Hz 2.2k 0.1uf

750.26Hz 1.5k 0.1uf

937.83Hz 1.2k 0.1uf

1125.4Hz 1k 0.1uf

3410.3Hz 3.3k 0.01uf

5115.4Hz 2.2k 0.01uf

Thanks

Aniruddha

Preamp Circuit