The circuit above is complete circuit contains tube amplifier circuit diagram and power supply circuit diagram. To make the stereo channel amplifier, build the similar amplifier circuit only and connect to the power supply using parallel connection with another same amplifier.

The tube EL34 is a thermionic valve or vacuum tube of the power pentode type. It has an international octal base (indicated by the ‘3’ in the part number) and is found mainly in the final output stages of audio amplification circuits and was designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. The American RETMA tube designation number for this tube is 6CA7. The Russian analog is 6P27S (Cyrillic: 6?27C).

The tube EL34 was widely used in higher-powered audio amplifiers of the 1960s and 1970s, such as the very popular Dynaco Stereo 70 and the Leak TL25(mono) and Stereo 60, and is also widely used in high-end guitar amplifiers because it is characterized by greater distortion (considered desirable in this application) at lower power than other octal tubes[citation needed] such as 6L6, KT88 or 6550.

20W power tube/valve amplifier circuit diagram with EL34

The post 20W Power Tube Amplifier with EL34 appeared first on Circuit Schematic Diagram.

Schematic Diagram:

Component part list:

PCB Layout:

Component Placement:

Take a note that this amplifier requires dual polarity power supply. Build the power supply using center tap transformer with output current 2A minimum and output voltage 30V, use about 6800 uF – 10000 uF electrolityc capacitors (elco). Good luck.

source: http://users.otenet.gr/~athsam/power_amplifier_35w_with_lm391.htm

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This is a small 12W audio amplifier over a load of 8 Ω, that combining the NE5534 integrated with a pair of V-MOSFET transistor output stage technology as we get excellent sound performance. MOSFET 2SK135 / 2SJ50 from Hitachi is used in this circuit. Input sensitivity of the circuit is 3V RMS maximum, the distortion factor is 0.002% at 1 kHz, and the frequency response is 15 Hz to 100 kHz. (-3dB).

This circuit requires a symmetrical (dual polarity) power supply with voltage output +/- 25V and the current output should be 2A maximum.

12W Audio Amplifier Components List:

Power Supply Specification:
Voltage: Symmetrical 25V
Current : 1A – 2A Max

MOSFET 2SK135 and 2SJ50 Datasheet Downloads:

SK133, SK134, SK135 Datasheet

1 file(s) 192.12 KB

Download

2SJ48, 2SJ49, 2SJ50 Datasheet

1 file(s) 193.15 KB

Download

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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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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 Circuit Schematic Diagram.

The tone control circuit is designed along with the amplifier circuit. If you build the complete circuit design, you will able to adjust the bass level, trebel level, volume level and the balance of right and left channel. If you want to build only the amplifier circuit, then you just need to remove the components before C108 and C208.

The circuit above is not completely drawn, there no the PIN numbers of IC. You must check the IC’s PIN number connection by comparing to the TA7227 datasheet.

Recommended operating supply voltage is about 12VDC with current supply is 1A minimum for maximum performance.

Download the TA7227 datasheet for circuit reference from following link:

TA7227 Datasheet

1 file(s) 601.10 KB

Download Datasheet

The post 2 x 5W Stereo Audio Amplifier based TA7227 + Tone Control appeared first on Circuit Schematic Diagram.

This is the 4W bridge amplifier circuit design based on power IC LM388 as the main component. Currently there are 2 chips of LM388 used since a LM388 only have one channel amplification. A single LM388 will deliver about 1.5W power audio output, while 2 pieces of it used with bridge connection, ten it will deliver up to 4W power audio output.

Notes:
For 6V supply and 4? loudspeaker, the circuit will deliver 1W audio output.
For 12V supply and 8? loudspeaker, the circuit will deliver 4W audio output.

Download LM388 datasheet for your 4W bridge amplifier reference:
? Download link

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This is 500W RMS power amplifier circuit design, build based on MOSFET. The circuit is very popular in EE audio hobbyist as “LEGEND stage Master MK2”. It is a very good and powerful amplifier. It uses 12x power MOSFET IRFP240.

To achieve even greater power, and they were often interested young friends, was developed even stronger version is capable of producing a full and true 500W RMS into 8 ohms. With such large forces had to resort to a radically different solution some degree, for even better reliability, or has increased the complexity of the tiles so that for this version is impossible to use the same tile as the previous two lower models (Legend and Legend Stage Master).

Specification:

Output power ——— 500W RMS / 8 ohms
Frequency range 15Hz-130kHz (-1dB) at 30W RMS
THD = <0.18% (at 1 kHz and 500 W)
THD = <0.01% (at 1 kHz and 400W and below this power)
BIAS around 25mA per output pair

500W RMS Power Amplifier PCB Design and Layout

This is the PCB design and component placement, you should mount the MOSFET on the heatsink to prevent overheating and maintain the performance of power amplifier.

This circuit designed by Dr Borivoje Jagodic >> original page for the reference.

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140W Power Amplifier Circuit Diagram:

The circuit contains all the blocks to build a mono amplifier. It is based on the Output Bridge Power Amplifier, and its protection circuit. Moreover, the compression function and a signal rectifier are added to complete the circuit.

The operation modes are driven by The Turn-on/off sequence block. In fact the IC can be set in three states by
the Stby/mute pin:

Standby ( Vpin < 0.8V), Mute (1.6V < Vpin < 3V), and Play (Vpin > 4V).

In the Standby mode all the circuits involved in the signal path are in off condition, instead in Mute mode the circuits are biased but the Speakers Outputs are forced to ground potential.

Download the STA5100 datasheet from below link to know the characteristic of STA5100 140W audio amplifier chip:
[wpdm_file id=70]

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This circuit can be operated with voltage range of 8V – 30V DC, with recommended supply is 24VDC. Mount the TDA1910 on a heatsink to prevent overheating and maintain the IC’s performance.

The TDA 1910 is a monolithic integrated circuit in MULTIWATT? package, intended for use in Hi-Fi audio power applications, as high quality TV sets.

The TDA 1910 meets the DIN 45500 (d = 0.5%) guaranteed output power of 10W when used at 24V/4W. At 24V/8W the output power is 7W min.

TDA 1910 Features:

• muting facility
• protection against chip over temperature
• very low noise
• high supply voltage rejection
• low “switch-on” noise.

Download TDA1910 datasheet, 10W audio amplifier, to know the IC characteristics from the following link:
[wpdm_file id=72]

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