20 watts power amplifier Archives - Amplifier Circuit Design

Audio Frequency Amplifier 20W based LM1875

Amplifier Circuit — Fri, 19 Aug 2011 15:52:32 +0000

Audio frequency amplifier 20 W schematic. The amplifier has a good performance and very low harmonic distortion. At the main component of the amplifier is chip LM1875 company National Semiconductor , which has protected against short circuit and overheating.

" data-image-caption="" data-large-file="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/08/Audio-frequency-amplifier-20-W.jpg?resize=630%2C380&ssl=1" class="aligncenter size-medium wp-image-334" title="Audio frequency amplifier 20 W" src="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/08/Audio-frequency-amplifier-20-W-300x207.jpg?resize=300%2C207" alt="Audio frequency amplifier 20 W" width="300" height="207" srcset="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/08/Audio-frequency-amplifier-20-W.jpg?resize=300%2C207&ssl=1 300w, https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/08/Audio-frequency-amplifier-20-W.jpg?w=646&ssl=1 646w" sizes="(max-width: 300px) 100vw, 300px" />This scheme requires a minimum number of components. The amplifier has a good performance and very low harmonic distortion. At the main component of the amplifier is chip LM1875 company National Semiconductor , which has protected against short circuit and overheating.

Specifications:
Voltage : 48 V DC
Current Consumption : 1 A
Output Power : 20 W at 4 ohms
Gain : 26 dB
Band : 20 Hz … 20 kHz

The post Audio Frequency Amplifier 20W based LM1875 appeared first on Amplifier Circuit Design.

A Simple 20 Watts Amplifier

Amplifier Circuit — Fri, 29 Jul 2011 18:31:02 +0000

20 Watts amplifier schematic diagram. Setting up the amplifier is reduced to setting the quiescent current of the transistor VT9. In the gap of the collector wires included milliammeter and adjustable resistor R11 sets the current 50-70 mA. It then examines the absence of a constant voltage at the amplifier output with an accuracy of 0.1 W.

" data-image-caption="" data-large-file="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/20-Watts-amplifier.jpg?resize=630%2C380&ssl=1" class="aligncenter size-medium wp-image-111" title="20 Watts amplifier" src="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/20-Watts-amplifier-300x188.jpg?resize=300%2C188" alt="20 Watts amplifier" width="300" height="188" srcset="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/20-Watts-amplifier.jpg?resize=300%2C188&ssl=1 300w, https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/20-Watts-amplifier.jpg?w=740&ssl=1 740w" sizes="(max-width: 300px) 100vw, 300px" />The scheme is very simple and if you decide to devote himself to the assembly of amplifiers and investigation of their activities, it makes sense to start with this amp.

Features :

Rated output power (RL = 4Ohm)	20W
Operating frequency range (for non-uniformity of 0.5 dB)	20 … 20000Hz
Conv. THD	0.7%
S / N ratio	-70dB
Nominal input voltage	1V
Input resistance	10Ohm
Supply voltage	+ / -25V

Setting up the amplifier is reduced to setting the quiescent current of the transistor VT9. In the gap of the collector wires included milliammeter and adjustable resistor R11 sets the current 50-70 mA. It then examines the absence of a constant voltage at the amplifier output with an accuracy of 0.1 W.

The whole setting is disabled when the load.
And do not forget to tightly attach the heat sink transistor VT4 transistors VT9. On this depends the temperature stability of the amplifier. You can, for example, hot melt glue or press the flange of the transistor VT9.

The post A Simple 20 Watts Amplifier appeared first on Amplifier Circuit Design.

Car Power Amplifier based TDA1562

Amplifier Circuit — Wed, 27 Jul 2011 17:16:13 +0000

Car Power Amplifier. Bridge-Tied Load (BTL) class-H high efficiency power amplifier in a 17 lead DIL-bent-SIL plastic power package. Its essence is that to a certain value output (approx. 20 watts) amplifier operates in the mode B. If the output power increases further, included a clever scheme to increase the voltage output stage and thus enables the amplifier to swing to a maximum power of 70 watts.

" data-image-caption="" data-large-file="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/Car-Power-Amplifier.jpg?resize=630%2C380&ssl=1" class="aligncenter size-medium wp-image-105" title="Car Power Amplifier" src="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/Car-Power-Amplifier-300x188.jpg?resize=300%2C188" alt="Car Power Amplifier" width="300" height="188" srcset="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/Car-Power-Amplifier.jpg?resize=300%2C188&ssl=1 300w, https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/07/Car-Power-Amplifier.jpg?w=701&ssl=1 701w" sizes="(max-width: 300px) 100vw, 300px" />Audio amplifier is built with the main component of Philips TDA1562 IC. The TDA1562 is a monolithic integrated 70 W/4 W.
Bridge-Tied Load (BTL) class-H high efficiency power amplifier in a 17 lead DIL-bent-SIL plastic power package. Its essence is that to a certain value output (approx. 20 watts) amplifier operates in the mode B. If the output power increases further, included a clever scheme to increase the voltage output stage and thus enables the amplifier to swing to a maximum power of 70 watts.

Key features :

Supply voltage	: 14.4V
Current consumption in silent mode	: 110mA
Input resistance	: 150Ohm
Rated output power (CG = 0.5%)	: 55W
Maximum power output (CG = 10%)	: 70W
Frequency	: 20 … 20000V

This chip is recommended for use in the entry-level subwoofer in your car. And the scheme presented is optimized for this application. Although, of course, no one bothers to play with it a full signal.

Parts List :
R1,R2,R3 : 10K
R4 : 1K
C1,C2 : 0,22uF
C3 : 10uF/16V
C4, C5 : 10000uF/25v
C6 : 0,1uF
C7 : 4700uF/25V
VT1 : KT3107
HL1 : any
DA1 : TDA1562

The post Car Power Amplifier based TDA1562 appeared first on Amplifier Circuit Design.