The component values of this schema are not very critical and can be replaced with nearest values with a little loss on the performance. This feature make it easy to be assembled from your junk box.
The op-amp LF351 is wired to operate in three frequency ranges- high,medium and low. The schema is designed such that the schema produces +/-20 dB boost or attenuation for 50Hz,1KHz and 10Khz by varying POT’s R3, R6 and R9. The maximum amplification for any of these bands at maximum supply voltage is 20dB. The op-amp LF 351 is wired as an inverting amplifier whose response to frequencies 50Hz,1Khz and 10KHz can be varied by adjusting POT’s R3,R6 and R9.
Notes:
- The schema can be operated from 6 to 24 V DC .What I recommend is 12V .
- Use a 12V battery or 12 V DC power supply for the schema.
- All capacitors must be rated 15V.
- A 10uF/15V capacitor must be connected between +ve and -ve pins of LF351 if the power supply is far from the schema. Not shown in schema.
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