10 Band Equaliser Circuit

This is the schematic diagram of 10 Band graphic equalizer circuit. The circuit is a mono channel, you need to build the another similar circuit to make it stereo. The power supply used for this circuit is dual polarity power supply (split power supply).

Download the full explanation about this 10 band graphic equalizer circuit and how its work here

4 Band Audio Graphic Equaliser Circuit

This is the circuit of 4 band audio graphic equaliser. The equalizer will cut and boost the four range of audio frequency, that are:

• Low frequency: Freq. 35-680Hz
• Medium frequency: Freq. 150-3kHz
• Medium/semi high frequency: Freq. 450-8.5kHz
• High audio frequency: Freq. 750-15kHz

Circuit note: Use regulated power supply, metalfilm resistor, MKM nonpolar capacitor and tantalum bipolar capacitor for best audio quality result.

This circuit is available in PDFdocument. Download 4 Band Equalizer circuit from the following link:
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5-Band Equaliser Circuit

Audio Circuit » Equaliser » 5-Band Equaliser Circuit

Above circuit is a 5-Band graphic equaliser circuit from Electronic For You Magazine, published May 2007. This equaliser uses low-cost op-amps NE5532 or LM833. Those ICs are good-quality op-amps powered by a single voltage supply are readily available in the market.

This 5-Band equaliser circuit is powered by a 12V DC regulated power supply. A well-regulated power supply using 7812 is recommended.

Download 5-Band Equaliser Circuit document from Electronic For You Magazine:
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Equalizer 3 band

This is mono 3 band equalizer circuit. The circuit is simple, cheap and easy to built. You should make two circuits for your stereo audio system.

Supply voltage may be anything from 6 to 30 Volts. Maximum boost 20dB is only realized with maximum supply voltage.