K139 ETC, K139 Datasheet

K139

Manufacturer Part Number

K139

Description

DIY Kit 139. Stereo 1W audio amplifier with DC volume control

Manufacturer

ETC

Datasheet

1.K139.pdf (2 pages)

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Current page: 1 of 2
Download datasheet (27Kb)

The TDA7053A is an integrated stereo audio power

amplifier with DC volume control in a 16-pin dual-in-line

plastic package. It is designed for use in TVs and

monitors but is also suitable for battery-operated

equipment.

The circuit used is straight out of the data book. PCB

dimensions are a tiny 43mm x 40mm (1.7” x 1.6”).

TDA7053A SPECIFICATIONS

The kit is constructed on single-sided printed circuit

board. Protel Autotrax & Schematic were used.

CONSTRUCTION

Start with the two resistors followed by the small

monobloc capacitor. Next comes the IC socket with the

electrolytic and polyester capacitors last. Be careful to get

the electrolytic capacitors in the right way around. The

positive lead is marked on the overlay. The negative lead

is marked on the body of the capacitor.

Solder the power and audio cables (supplied by you)

directly to the pads provided on the PCB.

CIRCUIT DESCRIPTION

All the work is done internally in the IC. The internal

circuit consists of a differential input stage with integrated

DC volume control, two class AB output stages and a

stabiliser circuit.

Resistors R1 and R2 provide a DC input impedance to

ground. The input signal is AC coupled into the amplifier

via capacitors C3 and C4. The output stages are a BTL

(Bridge Tied Load) configuration, resulting in increased

output power at low supply voltages.

The gain of each amplifier channel is controlled by the

DC voltage level on pins 2 and 8. This voltage is derived

from the DC supply using a simple voltage divider

network of resistor R3 and potentiometer VR1. Capacitor

C5 across the potentiometer provides power supply

decoupling of the volume control inputs. If the DC

4.5 - 18V supply voltage range

1.5A max non-repetitive peak output current

1.25A max repetitive peak output current

1.1W output power using 6V supply into 8

(THD = 10%)

20k

210uV noise output voltage

20Hz to 300kHz bandwidth (typical) at –1 dB

DIY Kit 139. Stereo 1W audio amplifier with DC volume control

internal input impedance

load

PAGE 1

volume control voltage falls below 0.4V the chip will

switch to mute mode.

The maximum voltage gain of the amplifier is internally

fixed at 40.5dB. The DC volume control has a logarithmic

characteristic. The total gain can be controlled from +40.5

to –33 dB.

Due to the BTL output configuration the outputs are

floating with respect to ground. Therefore the outputs of

the amplifier should never be connected to ground.

Capacitors C1 and C2 provide power supply decoupling.

IF IT DOES NOT WORK

Poor soldering (“dry joints”) is the most common reason

that the circuit does not work. Check all soldered joints

carefully under a good light. Re-solder any that look

suspicious. Check that all components are in their correct

position on the PCB. Are the electrolytic capacitors the

right way round?

PARTS LIST – K107A

Resistors (0.25W carbon)

4K7 yellow violet red ......... R1,2 .............................. 2

27K red violet orange ......... R3 ................................. 1

Capacitors

100nF monobloc 104 .......... C1 ................................. 1

470nF polyester 474 ........... C3,4 .............................. 2

1uF 16V electrolytic ........... C5 ................................. 1

220uF 25V electrolytic ....... C2 ................................. 1

Semiconductors

TDA7053A ......................... IC1 ................................ 1

Stereo Audio Amplifier IC with DC volume control

Miscellaneous

Potentiometer, 10K............. VR1 .............................. 1

IC socket, 16 pin, for mounting IC1 .......................... 1

PCB, K139................................................................. 1

Web Address & Email

You can email us at

any problems or requests. See our Web page at:

The Data Sheet for the TDA7053A may be downloaded

from the software download page on our website. Note the

‘A’ suffix is important. The TDA7053 with no suffix is a

different IC and is used in our Kit 107.

Single gang, PCB mounting

http://kitsrus.com

peter@kitsrus.com

if you have

Related parts for K139

K139 Summary of contents

Page 1

... TDA7053A ......................... IC1 ................................ 1 Stereo Audio Amplifier IC with DC volume control Miscellaneous Potentiometer, 10K............. VR1 .............................. 1 Single gang, PCB mounting IC socket, 16 pin, for mounting IC1 .......................... 1 PCB, K139................................................................. 1 Web Address & Email peter@kitsrus.com You can email us at any problems or requests. See our Web page at: http://kitsrus.com The Data Sheet for the TDA7053A may be downloaded from the software download page on our website ...

Page 2

DIY Kit 139. Stereo 1W audio amplifier with DC volume control PAGE 2 ...

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