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.

Read more at http://amplifiercircuit.net

90 W audio power amplifier based on transistor

18 Watt Audio Amplifier circuit diagram

18 Watt Audio Amplifier circuit diagram

Amplifier parts:
P1____22K Log. Potentiometer (Dual-gang for stereo)
R1___1K 1/4W Resistor
R2___4K7 1/4W Resistor
R3___100R 1/4W Resistor
R4___4K7 1/4W Resistor
R5___82K 1/4W Resistor
R6___10R 1/2W Resistor
R7___R22 4W Resistor (wirewound)
R8___1K 1/2W Trimmer Cermet (optional)
C1___470nF 63V Polyester Capacitor
C2,C5___100µF 3V Tantalum bead Capacitors
C3,C4___470µF 25V Electrolytic Capacitors
C6___100nF 63V Polyester Capacitor
D1___1N4148 75V 150mA Diode
IC1___TLE2141C Low noise, high voltage, high slew-rate Op-amp
Q1___BC182 50V 100mA NPN Transistor
Q2___BC212 50V 100mA PNP Transistor
Q3___TIP42A 60V 6A PNP Transistor
Q4___TIP41A 60V 6A NPN Transistor
J1___RCA audio input socket

Line Level Stereo Output on Genesis

I am planning on doing an s-video and rca jack mod on my Genesis. The mods I see done seem to all use the headphone jack as the source of the stereo sound. Is this the only way? I would prefer to have the output not be controlled by the volume slider. Is it possible to tap the signals before they go to the amp and route them to my own (fixed-gain) amp? Any help/advice is much appreciated.. visit page.

 Line Level Stereo Output on Genesis

DIY Micromitter Stereo FM Transmitter

This new stereo FM Micromitter is capable of broadcasting good quality signals over a range of about 20 metres. It`s ideal for broadcasting music from a CD player or from any other source so that it can be picked up in another location. For example, if you don`t have a CD player in you car, you can use the Micromitter to broadcast signals from a p visit page.

DIY Micromitter Stereo FM Transmitter