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In the circuit use a IC AN7171 . Minimum requirment  voltage is 12 volt and maximum voltage is 15  volt . Power output 2 X 30 W with impedance 4 Ohm . Speaker match woofer speaker , and operate it on the small room. This circuit matches variety of input device such us mixer , equalizer , tone control , processor , galaxy , bass boost , giga bass , and etc. This circuit schematic below : AN7171 amplifier schematic Output speaker is stereo , output couple with ground and add commponent resistor 2,2 Ohm and capacitor 100 nF.

The 600W Audio Amplifier Circuit Diagram is based around {LM4702}manufactured by NATIONAL semiconductors&{MJ11029-MJ11028} by ON semiconductors It is a high fidelity audio power amplifier. Designed for demanding consumer and pro-audio applications. You can also use this circuit with AV receivers, Audiophile power amps, Pro Audio High voltage industrial applications etc Amplifier output power maybe scaled by changing the supply voltage and number of output devices. The circuit includes thermal shutdown circuitry that activates when the die temperature exceeds 150°c. CIRCUIT’s mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state.  Simple 600W Audio Amplifier Circuit Diagram Power: Maximum Output power @ 8ohms : 300watt Absolute max power supply voltage :±38V to ±40V Recommended power supply voltage :±30V to ±35V

Here I tested a 600W 50Hz sine wave inverter circuit using push-pull topology instead of full-bridge topology. 2 PIC16F684's were used - one for SPWM and one for charging. 2 microcontrollers were used intentionally as the purpose was to test if I could use the microcontrollers together and use each of them for multitasking. 2 auxiliary transformers are used - one for powering the circuitry when running off mains and one for current sensing. Charging is done with 4 relays that are turned on/off according to input voltage and accordingly connect the input voltage to an appropriate transformer winding/tapping to keep output voltage relatively constant. Switching frequency is 16kHz. The sine table has 32 values. Here is the complete sine table: 0, 16, 32, 47, 62, 77, 91, 103, 115, 126, 136, 144, 151, 156, 160, 162, 163, 162, 160, 156, 151, 144, 136, 126, 115, 103, 91, 77, 62, 47, 32, 16, //65% 0, 17, 33, 49, 65, 80, 94, 107, 120, 131, 141, 149, 156, 162, 166, 168, 169, 168, 166, 162, 1...

The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and cat repeller, which can be used individuals to act as a deterrent against some animals. It should NOT be relied upon as a defence against aggressive dogs but it may help distract them or encourage them to go away and do not consider this as an electronic pest repeller. The ultrasonic dog repellant uses a standard 555 timer IC1 set up as an oscillator using a single RC network to give a 40 kHz square wave with equal mark/space ratio. This frequency is above the hearing threshold for humans but is known to be irritating frequency for dog and cats. Since the maximum current that a 555 timer can supply is 200mA an amplifier stage was required so a high-power H-bridge network was devised, formed by 4 transistors TR1 to TR4. A second timer IC2 forms a buffer amplifier that feeds one input of the H-bridge driver, with an inverted waveform to that of IC1 ou...

The 60 Hz inverter shown below is about as simple to make and as inexpensive as one could desire. Yes, it is capable of providing some very useful services. Operating from an automobile battery, it can supply 50 W for the operation of such devices as an ac-dc radio, electric shaver, fluorescent lamp, small soldering iron, 40 W incandescent lamp, recorder, or portable phonograph. Its essential ingredients are a filament transformer and two general-purpose germanium power transistors. Although this is a saturable-core oscillator, no separate feedback windings are employed. Rather, feedback is produced by cross-coupled connections in the manner of a multivibrator. At a full load, the efficiency is in the vicinity of 75 percent, and the output voltage is about 106 V. The "mild" pi-section filter despikes the output waveform and causes a trapezoid wave, rather than the usual square wave, to be available at the output. This makes the device more suitable for the operation of radios...

Rotel SURROUND SOUND RECEIVER RSX-1057 Continuous Amplifier Power (five channels driven) 75 watts/ch (20-20k Hz, <0.05% THD, 8 ohms) Continuous Amplifier Power (two channels driven) 100 watts/ch (1kHz, <1.0% THD, 8 ohms, DIN) Power Requirements (AC) 120 volts, 60Hz (USA version) 230 volts, 50Hz (CE version) Rotel SURROUND SOUND RECEIVER  RSX-1056 Continuous Amplifier Power (five channels driven) 75 watts/ch (20-20k Hz, <0.05% THD, 8 ohms) Continuous Amplifier Power (two channels driven) 100 watts/ch (1kHz, <1.0% THD, 8 ohms, DIN) Power Requirements (AC) 115 volts, 60Hz (USA version) 230 volts, 50Hz (CE version) RSX1056 power schematic RSX1056 Power amplifier schematic and PWB RSX1057 Power schematic RSX1057 Power amplifer schematic and PWB

Here is a simple but inexpensive inverter for using a small soldering iron (25W, 35W, etc) In the absence of mains supply. It uses eight transistors and a few resistors and capacitors. Transistors Q1 and Q2 (each BC547) form an astable multivibrator that produces 50Hz signal. The complementary outputs from the collectors of transistors Q1 and Q2 are fed to pnp Darlington driver stages formed by transistor pairs Q3-Q5 and Q4-Q6 (utilising BC558 and BD140). The outputs from the drivers are fed to transistors Q7 and Q8 (each 2N3055) connected for push-pull operation.  Use suitable heat-sinks for transistors Q5 through Q8. A 230V AC primary to 12V-0-12V, 4.5A secondary transformer (T1) is used. Soldering Iron Inverter Circuit Diagram   The centre-tapped terminal of the secondary of the transformer is connected to the battery (12V, 7Ah), while the other two terminals of the secondary are connected to the collectors of power transistors T7 and T8, respectively. When you power the ci...

This is a simple solar charger circuit project can be designed using few external electronic parts . This simple solar charger circuit is capable of handling charge currents of up to 1A. Alternate component values are given in the figure for lower current applications. The only adjustment is the voltage trip point when the current is shunted through the transistor and load resistor. This should be set with a fully charged battery. As the transistor and R3 have the entire panel’s output across them when the battery is fully charged, all of the current from the panel will be going through R3 and the Darlington transistor TIP112, so these must be well heat sunk. Adjust R1 for the trip point, usually 14.4 V – 15 V for a 12 V SLA or a 12 V Ni-Cd battery.

Circuit Diagram Description Here’s a circuit to display the song number in an audio system for quick reference to songs. It also serves the purpose of an extra visual indicator in modern audio systems.When the power is switched on, the power-on-reset circuit comprising 3.3k resistor R20 and 1µF, 25V capacitor C6 resets the counters, showing ‘00’ in the display. One can also reset the display to zero at any time by pressing reset switch S1. When the first song starts playing, the output pins of IC1 (KA2281) go low and capacitor C5 starts charging. This forward biases transistor T1 and hence the input to IC3 at pin 1 goes to high state. As a result, the output of the counter goes to the next state, showing 01 on the display. The counter remains in this state until the song is completed.During the time gap before the next song starts playing, capacitor C5 discharges. After discharging of capacitor C5, the input to IC3 becomes low again. When the song starts, the process described above is...

Used ICs: TB2132FN – TC4052BP – BA3308 – LA4627 – SC9153A Schematic [ Click on the schematics to zoom in ]

CAR EXTERIOR LIGHTS ELECTRONIC CIRCUIT DIAGRAM It shows the connection and wiring between each parts and component of exterior lights system of the vehicle such as the fusible link, junction block, tail light relay, cruise control, stop light switch, relay box, column switch, rear combination light, front combination light, license light, hazard light switch, turn-signal and hazard flasher unit, park/neutral position switch, back-up light switch, combination meter, and many more.

This is the project of Digital Fan Regulator Circuit diagram. The circuit presented here can be used to control the speed of  fans using induction motor. The speed control is nonlinear, i.e. in steps. The current step number is displayed on a 7-segment display. Speed can be varied over a wide range because the circuit can alter the voltage applied to the fan motor from 130V to 230V RMS in a maximum of seven steps.  The triac used in the final stage is fired at different angles to get different voltage outputs by applying short-dura-tion current pulses at its gate. For this pur-pose a UJT relax-ation oscillator is used that outputs sawtooth waveform. This waveform is coupled to the gate of the triac through an optocoupler (MOC3011) that has a triac driver output stage.  Pedestal voltage control is used for varying the firing angle of the triac. The power supply for the relaxation oscillator is derived from the rectified mains via 10-kilo-ohm, 10W series dropping/limit-ing...

Simple circuitry, low distortion, battery operated Variable, low impedance output up to 1V RMS Circuit diagram Parts: R1 5K6 1/4W Resistor R2 1K8 1/4W Resistor R3,R4 15K 1/4W Resistors R5 500R 1/2W Trimmer Cermet R6 330R 1/4W Resistor R7 470R Linear Potentiometer C1,C2 10nF 63V Polyester Capacitors C3 100µF 25V Electrolytic Capacitor C4 470nF 63V Polyester Capacitor Q1,Q2 BC238 25V 100mA NPN Transistors LP1 12V 40mA Lamp (See Notes) J1 Phono chassis Socket SW1 SPST Slider Switch B1 9V PP3 Clip for 9V PP3 Battery Circuit description: This circuit generates a good 1KHz sinewave using the inverted Wien bridge configuration (C1-R3 & C2-R4). Features a variable output, low distortion and low output impedance in order to obtain good overload capability. A small filament lamp ensures a stable long term output amplitude waveform. Useful to test the Audio Millivoltmeter, Audio Power Meter and other audio circuits published in this site. Notes: The lamp must be a low current type (12V 40-50m...

This is a Simple 1.5V Battery to 5V Voltage Converter Circuit Diagram. Stable and secure 5V DC (at 200mA max) from an ordinary 1.5V AA sized cell. At the heart of this circuit is IC1 MAX756 from Maxim, which is a CMOS step-up DC-DC switching regulator for small, low input voltage or battery-powered systems.   Simple 1.5V Battery to 5V Voltage Converter Circuit Diagram MAX756 accepts a positive input voltage down to 0.7V and converts it to a higher pin selectable output voltage of 5V (or 3.3V). Typical full-load efficiency for the this IC is greater than 87%. Max756 combine a switch-mode regulator with an N-channel MOSFET, precision voltage reference, and power-fail detector in a single monolithic device. The MOSFET is a “sense-FET” type for best efficiency, and has a very low gate threshold voltage to ensure start-up under low-battery voltage conditions (1.1V typ). The circuit can be easily wired on a very small rectangular common PCB.All connections should be kept as short as poss...

This Mini Voltage Source with Adjustable Current Limit variable is very simple and efficient, ideal for small shippers or circuits that require a current limiter with adjustable voltage that this circuit can vary from a few mA up to 2 A and voltage 1.225v up to 12V or more, depending on the power supply. Adjustable Voltage and Variable Current Limiter Circuit Diagram Once the current reaches the limit set by the 100R resistor, transistor BC547 begins to act on the voltage regulator in the Adj pin and the output voltage starts to decrease. If the output is shorted, the output voltage will reduce to almost zero, as a kind of protection.

The circuit of traffic lights in my opinion is a series of easy-hard-easy to make.  Where we are required to be able to condition the flame of three lamps by following the existing traffic regulations. If we use computer programming as a regulator of the third condition of the lights probably we will not spend too much time to make it. As an example with microcontroller programming or programming-based computer applications such as Visual Basic, Delphi and many others. But if you use a common electronic circuit components used may be somewhat time consuming to get the results you are fully in accordance with the conditions of traffic lights that use the streets. Well ... if you're looking for examples of a series of simple traffic light above the range can I recommend to you. The working principle of a series of traffic light above is very easy to understand. The series of above use the output from IC up / down counter 74 190 as the producer output tercacah and then conditioned usi...

Here is a white-LED-based emergency light that offers the following advantages. 1-It is highly bright due to the use of white LEDs. 2-The light turns on automatically when mains supply fails, and turns off when mains power resumes. 3-It has its own battery charger. When the battery is fully charged, charging stops automatically. The charger power supply section is built around 3-terminal adjustable regulator IC LM317 (IC1), while the LED driver section is built around transistor BD140 (Q2). In the charger power supply section, an input AC main is stepped down by T1 to deliver 9V, 500mA to the bridge rectifier, which comprises diodes D1 through D4. Filter capacitor C1 eliminates ripples. Unregulated DC voltage is fed to input pin 3 of IC1 and provides charging current through D5 and limiting resistor R15. By adjusting preset P1, the output voltage can be adjusted to deliver the required charging current. When the battery gets charged to 6.8V, D6 conducts and charging current from IC1 fi...

  Basic operation of this amplifier is on IC TEA2021 , In this circuit minimum require voltage is 4 volts and maximum voltage 25 volts. Power output 14 Watt with 4 Ohm impedance. See this schematic.

Remote Control Blocker Circuit Diagram . This circuit was designed to block signals from infrared remote controls. This will prove very useful if your children have the tendency to switch channels all the time. It is also effective when your children aren’t permitted to watch TV as a punishment. Putting the TV on standby and put-ting the remote control out of action can be enough in this case. Remote Control Blocker Circuit diagram : Remote Control Blocker Circuit Diagram The way in which we do this is very straightforward. Two IR LEDs continuously transmit infrared light with a frequency that can be set between 32 and 41 kHz. Most remote controls work at a frequency of 36 kHz or 38 kHz.  The disruption of the remote control occurs as follows. The ‘automatic gain’ of the IR receiver in TVs, CD players, home cinema systems, etc. reduces the gain of the receiver due to the strong signal from the IR LEDs. Any IR signals from a remote control are then too weak to be detected by the re...

22 Watt Stereo Amplifier circuit diagram. This circuit can be used for audio home amplifier and car audio amplifiers. It is extremely simple design, inexpensive and very easy to build. Even a newbie hobbyst will easy assemble this circuit. The scheme given here is a car stereo amplifier circuit can be used in That car or other vehicle. The circuit is based TDA1553, which is aClass-Baudioamplifier. As you can see this circuitisverysimple, consisting onlyof theICand thecapacitor6. Here is a circuit diagram of car stereo. This 20w car audio amplifier circuit described hereoffers a20 wattboosterthatwillallow youtorealize thepower amplifierwith which one canincrease the poweroutputfromthe carstereoup to20Wattsmaximum. The inputINis connected to theoutputof thereceiver, Uoutputis connectedto the speakeras shownoncaraudioamplifierscheme. via next.gr 22 Watt Stereo Amplifier circuit diagram.