Five Band Graphic Equalizer circuit

Other one unit of graphic EQ. five bands. The basic difference with the other circuits is, that I use instead of IC, transistor and the power supply, go up in +/- 24V DC, ensuring low distortion and bigger margins of overloading. With switch S1, we can isolate the EQ. inside or except operation, leaving the musical signal to pass without no alteration.. visit page.

Five Band Graphic Equalizer circuit   

5 Band Graphic Equalizer Circuit

This circuit is for graphic equalizer that can build with low components count and control using LA3600 single IC chip. The internal design of the chip uses transistors gyrator circuit, with connections to external capacitors to set the response. This is the figure of the circuit. Sorry, this picture is not clear. This graphic equalizer circuit is suitable for tape-recorders, radio-cassette recorders, car stereos, or home theater sound systems. Maximum supply voltage VCC max 20V must not be exceeded. The operating voltage is in the range of 5 to 15V. [Schematic diagram source: SANYO Electric`s Application Notes].
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5 Band Graphic Equalizer Circuit

Audio Equalizer

Designed for communications use, this equalizer circuit uses a Mitsubishi M5226P audio equalizer IC to adjust frequency response. It runs from a 9 to 20 V supply. C6 through C16 are polyester film capacitors of ± 5% tolerance.

Audio Equalizer

Octave Equalizer Circuit

This circuit is one section of an octave equalizer used in audio systems. The table shows the values of CI and C2 that are needed to achieve the given center frequencies. This circuit is capable of 12 dB boost or cut, as determined by the position of R2. Because of the low input bias current of the OP-08, the resistors could be scaled up by a factor of 10, and thereby reduce the values of CI and C2 at the low-frequency end. via next.gr

Octave Equalizer Circuit

300 watt – 1200 watt MOSFET Amplifier

When you need an amplifier with high watt power. For use in applications such as concert, theater, the festivals etc. This circuit is most suitable. Both Loudness and durability, that courage to try. For this circuit, typically the maximum watt power at load 4 ohm equal to 300 watt. or about 200 watt at load 8 ohm. Which the watt power very much this level. If you are not satisfied. Also may added a higher power.

300 watt – 1200 watt MOSFET Amplifier

Audio Amplifier 100W or 130W

Audio Amplifier 100W or 130W

ComponentRef./ValueTypeR1 120K 1/4W Resistor

R2 3K3 1/2W Resistor
R3 5K6 1/4W Resistor
R4 3K3 1/4W Resistor
R5 680R 1/4W Resistor
R6 120R 1/4W Resistor
R7 3K3 1/4W Resistor
R8 1K2 1/4W Resistor
R9 2K7 1/4W Resistor
R10 1K5 1/4W Resistor
R11 680R 1/4W Resistor
R12 120R 1/4W Resistor
R13 120R 1/4W Resistor
R14 0,33R 5W Resistor
R15 0,33r 5W Resistor
R16 10R 1W Resistor
R17 10R 1W Resistor
C1 10uF 16V Electrolytic Capacitor
C2 330µF 16V Electrolytic Capacitor
C3 470uF 35V Electrolytic Capacitor
C4 150pF Ceramic Capacitor
C5 100nF 100V Polyester Capacitor
RV1 1K Trimpot
D1 9V1 - 500mW Zener
T1 BC557 PNP transistor
T2 BC557 PNP transistor
T3 BC548 NPN transistor
T4 BD137 NPN transistor
T5 BD137 NPN transistor
T6 BD138 PNP transistor
T7 2N3773 NPN transistor
T8 2N3773 NPN transistor
L1 coil largest number of turns rolled in R16 with AWG22

90 W audio power amplifier based on transistor

Using only four transistors in the quasi-complementary amplifier configuration, this transistor power amplifier circuit can deliver 90W of power into 4 ohm loads and at low cost.

As shown in the transistor power amplifier circuit there are no expensive components in this circuit, except the power transformers and speakers. As shown in the diagram there are no expensive components in this circuit, except the power transformers and speakers. Input stage is formed by this two current driver directly raised a pair of transistors of the output stage. Transistor level end (2N3055) mounted on a heat sink to keep the lifetime of these devices. Supported by one source (of 80Vcc) at the output of the final stage, before the speaker, a capacitor is placed to block DC current, and just skip the audio signal. The power supply circuit 90 W audio power amplifier must be sufficient to provide current 1.5A per channel audio. Thus the power required to operate the stereo 3A and 6A is required for the four audio channels.

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90 W audio power amplifier based on transistor