Bass filter circuit diagram, subwoofer preamplifier with volume control. This is a bass filter include PCB, using the Op Amp Ne5532 or another of your choice. The circuit is simple to set up and already has symmetrical power supply, the transformer must use 9-12 volts / 500ma with center tap … In numerous application, the power supply can be made by the power amplifier … Just watch out for the limit supported by the voltage regulators.
The circuit has two pots, one for volume adjustment and another to adjust the filter cutoff frequency of 50 to 150Hz, if you need to install the pots in a panel, use shielded wires to make connections.
About the Bass filter circuit diagram subwoofer preamplifier
We use 2 operational amplifier integrated circuit, IC1A is configured as an inverting amplifier and gain of 13.6, if you need to change this just change R4. C11/R3 is a high pass RC filter with cutoff frequency at 15.91Hz and IC₂A is a high pass filter with cutoff frequency at 28Hz.
IC₂B is a low-pass filter with cutoff frequency adjustable from 28 to 234 Hz and IC1B is a low-pass filter with cutoff frequency at 234Hz. P1 adjusts the cutoff frequency and P2 adjusts the volume.
The scheme also features the power supply circuit using 7812 and 7912 voltage regulators.
To use, the filter still requires a power amplifier, so it can drive a subwoofer type speaker.
If you want to change the parameters of this circuit, see here on this site the calculators ⇒ http://sim.okawa-denshi.jp/en/Fkeisan.htm
Schematic Bass filter circuit diagram subwoofer preamplifier
Printed Circuit Board PCB for mounting Bass filter circuit diagram subwoofer preamplifier
BOM Subwoofer bass filter circuit assembly
Last update: 10/16/2022 20:19
|C1, C2||2200uF/25V||Electrolytic capacitor||2|
|C3, C4, C5, C6, C7, C8, C9, C10||100n||Polyester capacitor||8|
|C12, C13||100uf/25V||Electrolytic capacitor||2|
|LED1||Led 3 mm||Led Color of your choice||1|
|IC1, IC2||NE5532N, TL072 or equivalent||Operational amplifier||2|
|B1||KBP307 or equivalent.||Bridge rectifier||1|
|IC3||LM7812||12V positive voltage regulator||1|
|IC4||LM7912||Negative voltage regulator -12V||1|
|P1, P2||50k||Double potentiometer||2|
|R1, R2||56K||Green, blue, orange, gold||2|
|R3, R5, R6||10K||Brown, black, orange, gold||3|
|R4||68K||Blue, gray, orange, gold||1|
|R7, R8, R9, R10||6.8k||Blue, gray, red, gold||4|
|R11||4.7K||Yellow, Violet, Red, Gold||1|
|CN1 (IN)||Audio Input||Terminal block 2 pin 5.08 mm||1|
|CN2 (SUB)||Audio output for subwoofer||Terminal block 2 pin 5.08 mm||1|
|CN3 (AC)||Power Supply (Transformer)||Terminal block 2 pin 5.08 mm||1|
|Solder, Wires, PCB, Knob for the potentiometers, box, 9 to 15 Volt transformer /250mA, etc.|
Download files for mounting the bass filter, including PCB in PDF, PNG, PS and Gerber
Printed circuit board now updated with Gerber added.
- Download LM7912 PDF data sheet
- Download PDF datasheet Lm7812
- Download PDF datasheet F NE5532
- Download PDF datasheet TL072
- Download PDF datasheet KBP307