The IC njm4558 subwoofer bass boost circuit. 4558 is an op-amp which is most commonly using in the audio amplifier. The ic is available in an old subwoofer amplifier and stereo amplifier board.
The ic is inbuilt with two op-amps. The ic will able to handle the low audio frequency ranges. The operation voltage of this ic is 5v to 18v dc supply. only demerits of this ic are, not using for high voltage power supply circuit. The ic is available as a8 pin plastic package.
- Also, check NE5532 ic Low pass filter circuit diagram
4558 ic pinout
| PIN NUMBER | DESCRIPTION |
| 1 | out of first op amp |
| 2 | -in non inverting pin |
| 3 | +in inverting pin |
| 4 | Gnd ground supply |
| 5 | +in inverting pin |
| 6 | -In non inverting pin |
| 7 | Out of second op amp |
| 8 | Vcc- positive supply pin |
Njm4558 ic subwoofer bass boost circuit diagram
In this subwoofer bass boost circuit, the power supply circuit also included. To power this ic we are using LM7815 and LM7915 these are 15 volts positive and negative voltage regulator ic.
The regulator ic will provide a constant voltage without any fluctuations.
Connection
The connection of this circuit is very simple and easy to understand. The input of this circuit connected to the audio left and right audio signals.
Then subwoofer amplifier connecting on the output of this circuit.
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