This is the circuit diagram of power amplifier 45W using power uPC 1230 as the main component. The pre amp head has been added in the circuit using uPC 1032. This is an popular old circuit for hobbysts and the 45 Watt amplifier circuit should be working fine since the PCB already on the market few decades ago :). I don’t know weather the power IC is available or already discontinued.

Power Amplifier 45W Circuit Notes:

• The Cx part is 25pF, you can add this component to the circuit, but you can also not use it in the circuit.
• Use stabilized and regulated power supply to minimize the sound noise/buzz.
• The uPC 1230 power IC need proper heatsink to prevent overheat on the IC and keep good performance of the amplifier.

Circuit source: elektro-hoby.blogspot.com

A power audio amplifier is a specific type of power amplifier designed to amplify audio signals, such as those produced by musical instruments, audio sources like CD players or smartphones, or other audio devices. The primary purpose of a power audio amplifier is to increase the power of the low-level audio signal to a level that can drive speakers and produce sound at the desired volume.

Power audio amplifiers are commonly used in audio systems, including home stereo systems, professional audio setups, public address systems, and sound reinforcement systems. The amplifier’s role is to take the weak audio signal from the source and provide enough power to drive the speakers, allowing them to reproduce sound with sufficient volume and clarity.

Power audio amplifiers come in various classes, such as Class A, Class AB, and Class D, each with its own characteristics in terms of efficiency, heat dissipation, and distortion. The choice of amplifier class depends on the specific requirements and preferences of the audio system. Additionally, power audio amplifiers are rated in terms of their power output, measured in watts, and this rating helps determine the amplifier’s capability to drive speakers of different sizes and efficiency.

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This is a basic circuit of car horn and lamp flasher that starts playing the vehicle horn at whatever point your vehicle is backward rigging. The circuit (First Diagram) utilizes double clock NE556 to create the sound. One of the clocks is wired as an astable multivibrator to produce the tone and the other is wired as a monostable multivibrator.

How the reversing gear horn and lamp flasher circuit work

Working of the circuit is basic. At the point when the vehicle is backward rigging, turn around gear switch S1 of the vehicle gets shorted and the monostable clock triggers to give a high yield. Thus, the intersection of diodes D1 and D2 goes high for a couple of moments relying upon the timeframe created through resistor R4 and capacitor C4. Now, the astable multivibrator is empowered to begin swaying. The yield of the astable multivibrator is taken care of to the speaker through capacitor C6. The speaker, thus, produces sound until the yield of the monostable is high.

At the point when the intersection of diodes D1 and D2 is low, the astable multivibrator is debilitated to quit wavering. The yield of the astable multivibrator is taken care of to the speaker through capacitor C6. The speaker, thusly, doesn’t deliver sound.

Collect the circuit on a universally useful PCB and encase in an appropriate bureau. Interface the circuit to the vehicle invert switch through two wires with the end goal that S1 shorts when the vehicle gear is turned around and is open in any case. To control the circuit, utilize the vehicle battery.

The flasher circuit (Second Circuit) is worked around clock NE555, which is wired as an astable multivibrator that yields square wave at its pin 3. A 10W auto bulb is utilized for flasher. The glimmering pace of the bulb is chosen by preset VR1.

Gather the circuit on a universally useful PCB and encase in a reasonable bureau. The flasher bulb can be mounted at the vehicle’s back side in a reflector or a tight painted appropriate fenced in area.

Horn and Lamp Flasher Circuit Note

A higher-wattage bulb may diminish the force of the front lamp. You can encase both the carreversing horn and flasher circuits together or independently in a bureau in your vehicle.

Download this car horn and lamp flasher circuit in PDF document:

Horn and Lamp Flasher Circuit for Car Reverse Mode

1 file(s) 230.69 KB

Download

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The Jal State Board supplies water for a limited duration in a day. The time for water supply is determined by administration and the community does not know the same. In this situation, this water alarm circuit would save people from waiting a long time because they would notify them as soon as the water supply began.

At the heart of this circuit is a small water sensor. To make this water sensor, you need two foils – aluminum foil and plastic foil. You can assemble sensors by rolling aluminum and plastic foil in concentric cylindrical shapes. Connect one end of the insulated flexible cable to the aluminum foil and the other end to resistor R2. Now install this sensor in the tap so that the water can flow through it without interruption. To complete the circuit, connect another cable from the junction of pins 2 and 6 IC1 to the water pipe or water tap itself.

How the Drinking Water Circuit Works

Timer 555 is transferred as an astable multivibrator. The multivibrator will only function when water flows through the water tap and completes the circuit connection. Oscillates at about 1 kHz. The output of the timer on pin 3 is connected to the LS1 loudspeaker via capacitor C3. As soon as the water starts flowing through the tap, the loudspeaker starts to ring, which signifies the resumption of the water supply. It remains ‘active’ until you turn off the circuit by switching S1 or removing the sensor from the tap. This circuit works with a 9V power supply.

Install the circuit on each general purpose PCB and house in a suitable cabinet. The water sensor is inserted into the water tap. Connect the end of the junction 555 pin 2 and 6 to the water tap body. Use the S1 on / off switch to turn on the circuit with a 9V PP3 battery.

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This 200W MOSFET amplifier circuit designed for single or mono audio channel application. You should build two similar circuits for stereo audio application. Build one first for performance testing to ensure that this circuit really wongking well with great audio performance.

The power supply used for this circuit is a symmetrical / dual polarity type. You need 4 amperes minimum of transformer with +/- 45V output. For stereo application, use about 8 amperes, although the 5A transformer is good enough . You may use the power supply circuit design on this post: 200W Power Amplifier using Transistor

200W MOSFET Amplifier PCB Layout Design

Bottom / Chopper PCB Design

Top PCB Design / Component Placement

A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) power audio amplifier is an amplifier circuit that utilizes MOSFETs as the main active components for amplifying audio signals. MOSFETs are a type of transistor widely used in electronic circuits for various applications, including power amplifiers.

In the context of power audio amplifiers, MOSFETs can be employed in the output stage of the amplifier circuit. The output stage is responsible for delivering power to the speakers and is a crucial component in determining the overall performance of the amplifier.

The post 200W MOSFET Amplifier based IRFP250N appeared first on Electronic Circuit Diagram.

The main advantages of this solution are the following:
– High power with low voltage.
– Considerable power, even at high load values (Up to 16 Ohm).
With a load of 8 Ohms and a power supply voltage of ± 25V, the maximum performance that can be obtained is 150 W per channel. While with 16 Ohms load, and a power supply voltage of ± 35V, we will have a maximum of 170 W per channel.

This 300W RMS stereo power amplifier require symmetrical power supply to work, the circuit diagram is included in this post.

300W RMS Stereo Power Amplifier Schematic Design

300W RMS Stereo Power Amplifier Part List

SEMI-CONDUCTORS
4 TDA 7294

RESISTORS
56K Ohms (green, blue, orange) : 8
8K2 Ohms (gray, red, red) : 3
5K1  Ohms (green, brown, red) : 14
8.2 Ohms 1W (gray, red, gold) : 4
2.7 Ohms 1W (red, purple, gold) : 4
22K Ohms (red, red, orange) : 2
1K Ohms (brown, black, red) : 4

CAPACITORS
4700 uF / 35v electrolytic capacitor : 2
22 uF / 35v electrolytic capacitor : 12
1 uF / 35v electrolytic capacitor : 4
0.1 uF / 250v polyester capacitor : 4
0.1 uF / 100v polyester capacitor : 4
0.47 uF / 100v polyester capacitor : 4
10 pF / ceramic capacitor : 4
390 pF / ceramic capacitor: 2

MISCELLANEOUS
25-amp diode bridge : 1
Diodes 1N4148 : 2
fuse holders for printed and 6 amp fuse : 4
small 3-pin connectors : 2
large 3-pin connectors : 2
small 6-pin connector : 1
18x18v to 12 Amp transformer : 1
Square mica insulation. : 4
coils of 10 coils with air core : 4
Of 1/4 inch and wire 18.

The resistance of the 12v cooler is calculated:
(15 / milliamperes of fan) = x Ohms.

300W RMS Stereo Power Amplifier PCB Layout Design

Power Supply for 300W RMS Stereo Power Amplifier

The post 300W RMS Stereo Power Amplifier based IC TDA7294 appeared first on Electronic Circuit Diagram.

Stereo Tone Control Component List

INTEGRATED CIRCUIT

• TL072 : 2
• TL071 : 1

RESISTORS All 1/4W

• 22K ohm (red, red, orange) : 10
• 10K ohm (Brown, Black, Orange) : 10
• 1K ohm (brown, black, red) : 3
• 100K ohm (brown, black, orange) : 3
• 100 ohm (Coffee, Black, Coffee) : 4
• stereo/dual potentiometers 100K ohm : 3
• stereo/dual potentiometers 10K ohm : 2
• mono/single potentiometers 10K ohm : 2

CAPACITORS

• 1uF/25V electrolytic capacitor : 4
• 10uF/25V electrolytic capacitor : 1
• 4.7uF/25V electrolytic capacitor : 2
• 6.8nF (682) polyester capacitor : 2
• 1.5nF (152) polyester capacitor : 2
• 47nF (473) polyester capacitor : 2
• 1nF (102) polyester capacitor : 2
• 100nF (104) polyester capacitor : 4
• 2200uF x 25 V electrolytic capacitor : 2
• 1uF nonpolar capacitor (105) : 5

Stereo Tone Control PCB Layout and Component Placement

Power Supply Circuit

The power supply type for the stereo tone control is symmetrical and regulated and on its output we use +15 and -15 VDC. The LM7815 will deliver stabilized +15VDC and the LM7915 will deliver stabilized -15 VDC. For symmetrical source, the TL072 VCC range will be 7V up to 36V, so you may use a pair of regulator IC LM7805/LM7905 up to LM7815/7915.
Below is the schematic diagram, pcb design and component layout:

The post Stereo Tone Control with Line In + Microphone Mixer appeared first on Electronic Circuit Diagram.

Schematic Diagram 4in1: 100W RMS Power Amplifier With VU, Power Supply and Tone Control

Part Lists

Active Components

• IC TDA 7294 : 1
• IC 7812 : 1
• IC LM3914 : 1
• Diode Zener 12V : 2
• IC 4558 : 1
• Diode 1N4148 : 1
• Rectifier Bridge Diode 6 A : 1
• LED : 11

Resistors

• 390 Ω – 1/4w : 1
• 680 Ω – 1/4w : 1
• 1K Ohm – 1/4w : 2
• 2k2 Ohm – 1/4w : 3
• 2k7 Ohm – 1/4w : 1
• 3k3 Ohm – 1/4w : 1
• 5k6 Ohm – 1/4w : 1
• 8k2 Ohm – 1/4w : 1
• 10K Ohm – 1/4w : 4
• 20K Ohm – 1/4w : 2
• 22K Ohm – 1/4w : 3
• 30K Ohm – 1/4w : 1
• 47k Ohm – 1/4w : 1
• 10R ohm – 1/4w : 1
• 56R Ohm – 2w : 1
• 2K2 Ohm – 2w : 2
• Potensiometer 50K Ohm : 3

Capacitors

• 100pF nonpolar capacitor disc / ceramic : 2
• 6n8F nonpolar polyester capacitor : 2
• 10nF nonpolar polyester capacitor : 2
• 100nF nonpolar polyester capacitor : 6
• 220nF nonpolar polyester capacitor : 1
• 2.2uF/63V electrolytic capacitor : 1
• 10uF/63V electrolytic capacitor : 5
• 22uF/63v electrolytic capacitor : 2
• 100uF/63V electrolytic capacitor : 2
• 4700uF/63V electrolytic capacitor : 2

100W RMS Power Amplifier PCB Layout

Component Placement

This is a single channel (mono) audio system. For stereo audio system, you need two similar circuit and make some changes such as: use higher transformer current, higher diode current, higher capacitor value for the power supply module. Use only one power supply. Use stereo potensiometer and connect to the two boards using cable.

The post 100W Power Amplifier Based IC TDA7294 appeared first on Electronic Circuit Diagram.

120W Power Amplifier Part List

Transistors

• 2N3055 (substitution: MJ15003 or 2N3772) : 2
• MJ2955 (substitution: MJ15004 or 2N3771) : 2
• TIP42 : 2
• TIP41 : 1
• 2SC2229 or 2SC2230 or C1573 : 2
• A1015 or A872 or A733 : 2

Capacitors

• 100uF/50V electrolytic capacitor: 2
• 470nF (474) nonpolar polyester capacitor: 1
• 100pF (101) nonpolar ceramic capacitor : 2
• 470pF (471) nonpolar ceramic capacitor : 2
• 10pF nonpolar ceramic capacitor : 2
• 100nF (104) 100V nonpolar polyester capacitor : 2

Resistors

• 0.33 Ω (5W) : 4
• 10 Ω to (1W) – brown, black, black : 1
• 100 Ω (1W) – brown, black, brown : 2
• 33 Ω (1/4W) – orange, orange, black : 1
• 150 Ω (1/4W) – brown, green, brown : 3
• 10KΩ (1/4W) - brown, black, orange : 1
• 1KΩ (1/4W) - brown, black, red : 1
• 4.7KΩ (1W) - yellow, violet, red : 1
• 68KΩ (1/4W) - blue, gray, orange : 1
• 56KΩ (1/4W) - green, blue, orange : 1
• 33KΩ (1/4W) – orange, orange, orange : 1
• 3.3KΩ (1/4W) – orange, orange, red : 2

Diodes

• 3A Diode 1N5404 : 2
• 1A Diode 1N4007 : 3
• Zener diodes between 20 and 24 volts : 1

Others

• 3A fuse
• small 3-pin (GP) connector
• large 6-pin connector (Molex)
• aluminum heatsink
• potentiometer of 20K if you want to add volume control

120W Power Amplifier PCB Layout Design

Bottom PCB Layout (Copper)

Top PCB Layout and Component Placement

How to mount the transistors to the aluminium heatsink, see below image:

The points are: prevent circuit shortage, use proper isolator and use thermal compound for maximum heat spreading to the heatsink. Use mica between the transistor and the heatsink.

Power Supply Circuit for 120W Power Amplifier

Power Supply Bottom PCB Layout

Power Supply Top PCB Design

Power Supply Part List

• Transformer for the mono amplifier should be 35 + 35 volts AC with a minimum of 3 amps. If the stereo channel, the amperage should be doubled.
• Capacitors of 4700 uF/63V: 4
• Diode bridge (rectifier) ​​of 15 Amps: 1

120W Power Amplifier Wiring Connection

This is how to connect the amplifier module to the speaker, power supply and audio input. And connect the power supply module to the transformer.

The post 120W Power Amplifier + Power Supply appeared first on Electronic Circuit Diagram.

Power supply circuit for bass guitar preamp also included in the PCB design. Simply connect the power supply section to the output of transformer with the secondary 15 + 15 V / 500 mA.

Bass Guitar Preamp Pedal PCB Design

Bass Guitar Preamp Top PCB

Bass Guitar Preamp Top Component Placement

Bass Guitar Preamp Pedal Connection

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If you use it with only one 8 ohm speaker, it will deliver a power of 100w. The printed circuit board has the following measures: 13.6 cm x 13.9 single sided. The power supply used for this circuit is a symmetrical type which capable to delivers ± 50 VDC by 4 Amperes to the circuit. The power supply schematic is included in this board.

200W Amplifier PCB Circuit Board

200W Power Amplifier Parts

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