Diagram Diagosis

This is the diagram of 2x6W stereo audio amplifier based LA4440 power IC. Actually, the LA4440 can be used in both stereo mode and mono (bridge) mode, but the circuit presented in this post is LA4440 in stereo mode. The recommended power supply is 13.2V, while the maximum voltage rated at 18V.

LA4440 Features:

• Built-in 2 channels (dual) enabling use in stereo and bridge amplifier applications.
• Dual : 6W´2 (typ.)
• Bridge : 19W (typ.)
• Minimum number of external parts required.
• Small pop noise at the time of power supply ON/OFF and good starting balance.
• Good channel separation.
• Good ripple rejection : 46dB (typ.)
• Low distortion over a wide range from low frequencies to high frequencies.
• Small residual noise (Rg=0).
• Easy to design radiator fin.
• Built-in protectors.
• Built-in audio muting function.
• Thermal protector
• Overvoltage, surge voltage protector
• Pin-to-pin short protector

This is a one watt home stereo amplifier module project using the KA2209 IC from Samsung, which is equivalent to the TDA2822. It operates from 3-12V DC & will work from a battery since the dormant current drain is low. It requires no heat sink for normal use. The input & output are both ground referenced. Maximum output will be obtained with a 12V power supply & 8 ohm speaker, however it is suitable for driving headphones from a supply as low as 3V.

The Specifications of the home stereo amplifier :

D.C. input : 3 – 12 V at 200 – 500 mA max
Idle current : approx. 10 mA
Power output : > 1 Watt max. 4-8 ohms, 12V DC
Freq. Resp. : approx. 40 Hz to 200 kHz, 8 ohm, G=10
THD : < 1 % @ 750 mW, 4-8 ohm, 12V
Gain : approx. x10 (20 dB) OR x100 (40dB)
S/N ratio : > 80 dB, G = 20 dB
Sensitivity : < 300 mV, G = 20 dB
Input Impedance : approx. 10 k ohm

Description 

The gain is adjustable from ten to 100, i.e. twenty to 40 dB. Start with feedback resistors R1 and R3 of 1k ohm, this will give a gain of ten which ought to be adequate for most applications. In case you need more gain, you can remove resistors R1 and R3.This will give a gain of about 100, or 40 dB.The input attenuation can be adjusted by the potentiometer which can be used as a volume control. The IC gain ought to be kept as low as necessary to accomplish full output, with the in put potentiometer and your signal source at maximum.

Voltage Gain = 1+ R1/R2 = 1+R3/R4, however the maximum gain with no outside feedback is about 100, or 40dB. (GdB = 20log Gv)

This will keep the signal to noise ratio as high as feasible. Additional gain provided by the amplifier will reduce the S/N ratio by a similar amount, since the input noise figure is constant. Other values for R1 and R3 of between 1k and 10k ohm can be used if an intermediate gain level is necessary.

If driving a pair of headphones, you may also need a 100 ohm resistor in series with each output to reduce the output level, depending on headphone impedance & sensitivity. Make positive you start with the volume right down to check. Numerous headphones may be driven from the amplifier in the event you wish, since most headphones have at least 16 ohm impedance, or more often 32 ohm.

There are only a few outside parts, the IC contains most of the necessary circuitry. R1,R2 and R3,R4 are the feedback resistors. C1 provides power supply decoupling. C2 and C3 are the input coupling capacitors, which block any DC that might-be present on the inputs. C4,C5 block DC in the feed back circuit from the inverting inputs, and C6,C7 are the output coupling capacitors. C8, R5 and C9,R6 act as Nobel networks providing a high frequency load to maintain stability at frequencies where loud speaker inductive reactant may become excessive. The pot provides adjustable input level attenuation.

Output power: 6W into 4 Ohm load, FET input stage - Passive Tone Control

Tiny, portable Guitar Amplifiers are useful for practice on the go and in bedroom/living room environment. Usually, they can be battery powered and feature a headphone output. This project is formed by an FET input circuitry, featuring a High/Low sensitivity switch, followed by a passive Tone Control circuit suitable to Guitar or Bass. After the Volume control, a 6W IC power amplifier follows, powered by a 12-14V dc external supply Adaptor or from batteries, and driving a 4 Ohm 10 or 13cm (4"/5") diameter car loudspeaker. Private listening by means of headphones is also possible.

Circuit diagram:
Parts:

P1______________1M Linear Potentiometer
P2____________100K Log Potentiometer
R1_____________68K 1/4W Resistor
R2____________470K 1/4W Resistor
R3______________2K7 1/4W Resistor
R4______________8K2 1/4W Resistor
R5____________680R 1/4W Resistor
R6____________220K 1/4W Resistor
R7_____________39R 1/4W Resistor
R8______________2R2 1/4W Resistor
R9____________220R 1/4W Resistor
R10_____________1R 1/4W Resistor
R11___________100R 1/2W Resistor
R12_____________1K5 1/4W Resistor
C1____________100pF 63V Polystyrene or Ceramic Capacitor
C2,C5,C9,C14__100nF 63V Polyester Capacitors
C3____________100µF 25V Electrolytic Capacitor
C4_____________47µF 25V Electrolytic Capacitor
C6______________4n7 63V Polyester Capacitor
C7____________470pF 63V Polystyrene or Ceramic Capacitor
C8______________2µ2 25V Electrolytic Capacitor
C10___________470µF 25V Electrolytic Capacitor
C11____________22nF 63V Polyester Capacitor
C12__________2200µF 25V Electrolytic Capacitor
C13__________1000µF 25V Electrolytic Capacitor
D1______________3mm red LED
Q1____________BF245 or 2N3819 General-purpose N-Channel FET
IC1_________TDA2003 10W Car Radio Audio Amplifier IC
SW1,SW2________SPST toggle or slide Switches
J1____________6.3mm Mono Jack socket
J2____________6.3mm Stereo Jack socket (switched)
J3_____________Mini DC Power Socket
SPKR__________4 Ohm Car Loudspeaker 100 or 130mm diameter

Notes:

• Connect the output Plug of a 12 - 14V dc 500mA Power Supply Adaptor to J3
• Please note that if the voltage supply will exceed 18V dc the IC will shut down automatically

Technical data:

Output power (1KHz sinewave):
6W RMS into 4 Ohm at 14.4V supply
Sensitivity:
50mV RMS input for full output
Frequency response:
25Hz to 20kHz -3dB with the cursor of P1 in center position
Total harmonic distortion:
0.05 - 4.5W RMS: 0.15% 6W RMS: 10%

Tone Control Frequency Response:

This electronic amplifier project is an IC amplifier module from ST Microelectronics, the TDA7294. It is intended for use as a prime quality audio classification AB amplifier in hi-fi softwares. Its low noise and distortion, broad bandwidth and good output present functionality, enabling it to produce excessive power in to each four ohm and 8 ohm heaps. Its each quick circuit and thermal protection.

With the addition of a handful of sections and the appropriate power provide, this module will deliver over 50W RMS in to four or eight ohms-with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Inter-modulation Distortion (IMD). It can also be appropriate as a replacement power amp stage, or improve for loads of existing amplifiers of between 30W-50W, provided they have got the precise twin provide, & most do.

The Specifications of the digital amplifier project there are:

D.C. Input : 35V
Output energy : > 50W RMS, 4-8 ohm load.
Gain : 24 dB (30dB modification)
Input sensitivity : one.3V for 50W, 8 ohm
Signal-to-Noise ratio : > ninety five dB, (>105 dBA)
Frequency response : approx. 20Hz - 200kHz, �3 dB
Slew charge : > 10V/uS
THD : < 0.01%, 1W-40W, 1kHz
IMD : < zero.01%, 1W

The maximum provide voltage of the IC is +/- 40V. However the most dissipation of the IC can be exceeded even at a lower voltage. Therefore the provide voltage used require now not be over +/- 35V. This may additionally be developed the utilization of a 50V heart tapped-transformer, a diode bridge rated at 5A (min.) & a pair of electrolytic capacitors, as shown under. A lower secondary voltage transformer may even be used however the reduced DC voltage will lead to less energy output in to 8 ohms. You can still receive 50W in to four ohms with best 24V supply rails.

A 36V C.T. transformer offers you approx +/- 25V rails. The-mains transformer used must be feed at a most of 80VA. In the experience you require to run modules in a stereo amplifier you want to use a typical power supply. In this case the transformer ought to be charged at 150VA or higher.

Most of the circuitry is contained throughout the IC module. The enter sign is applied to pin three by capacitor C1 & low-pass filter R1/C2. The filter strengthens the coronary heart beat response & lend a hands stop RF indicators. The lower -3dB point is determined-by R2/C1 & R4/C3. This is set 20Hz for the values used. The higher -3dB point is over 200kHz. C7/C8 & C9/C10 provide further power provide filtering or decoupling.

R3/R4 are the feedback resistors. The achieve is 1+R3/R4 which is approx 16 times, or 24dB. In case you wish to elevate the enter sensitivity you can additionally alter the resistors to swimsuit. Changing R3 to 22k would elevate the acquire to 30dB and lower the enter-required for 50W in to eight ohm, to 0.6V, without affecting efficiency so much. In case you scale back the worth of R4 you are going to additionally need to raise C3 to maintain bass response, as this units the comments low frequency roll off.

Pin ten is a mute enter and pin 9 gives a standby mode. Muting ought to always happen earlier than standby mode is chosen. Connecting these pins completely to the provision rail ensures that the amplifier comes on right away on energy up. Any switch-on clicks may be eradicated by means of increasing the time constants of R5/C4 and R6/C5 if necessary.

Make definite that a heavy accountability heat-sink charged as a minimum one.4 stage C/W or higher is used.

10W Stereo Audio Amplifier Circuit Diagram :

22 Watt Car Subwoofer Amplifier Circuit diagram:

Parts:

P1_____________10K Log Potentiometer
P2_____________22K Dual gang Linear Potentiometer
R1,R4___________1K 1/4W Resistors
R2,R3,R5,R6____10K 1/4W Resistors
R7,R8_________100K 1/4W Resistors
R9,R10,R13_____47K 1/4W Resistors
R11,R12________15K 1/4W Resistors
R14,R15,R17____47K 1/4W Resistors
R16_____________6K8 1/4W Resistor
R18_____________1K5 1/4W Resistor
C1,C2,C3,C6_____4µ7 25V Electrolytic Capacitors
C4,C5__________68nF 63V Polyester Capacitors
C7_____________33nF 63V Polyester Capacitor
C8,C9_________220µF 25V Electrolytic Capacitors
C10___________470nF 63V Polyester Capacitor
C11___________100nF 63V Polyester Capacitor
C12__________2200µF 25V Electrolytic Capacitor
D1______________LED any color and type
Q1,Q2_________BC547 45V 100mA NPN Transistors
IC1___________TL072 Dual BIFET Op-Amp
IC2_________TDA1516BQ 24W BTL Car Radio Power Amplifier IC
SW1____________DPDT toggle or slide Switch
SW2____________SPST toggle or slide Switch capable of withstanding a current of at least 3A
J1,J2__________RCA audio input sockets
SPKR___________4 Ohm Woofer or two 8 Ohm Woofers wired in parallel

Notes:

• IC2 must be mounted on a suitable finned heatsink
• Due to the long time constant set by R17 and C9 in the dc voltage stabilizer, the whole amplifier will become fully operative about 15 - 30 sec. after switch-on.

Technical data:

Output power (1KHz sinewave):
22W RMS into 4 Ohms at 14.4V supply
Sensitivity:
250mV input for full output
Frequency response:
20Hz to 70Hz -3dB with the cursor of P2 fully rotated towards R12
20Hz to 150Hz -3dB with the cursor of P2 fully rotated towards R11
Total harmonic distortion:
17W RMS: 0.5% 22W RMS: 10%

100W POWER AMPLIFIER USING TDA7293 CIRCUIT DIAGRAM

The TDA7293 amplifier specifications might lead you to believe that it can use supply voltages of up to ±50V. With zero input signal (and therefore no output) it might, but I dont recommend anything greater than ±35V if 4 ohm loads are expected, although ±42V will be fine if you can provide good heatsinking. In general, the lower supply voltage is more than acceptable for 99% of all applications, and higher voltages should not be used unless there is no choice. Naturally, if you can afford to lose a few ICs to experiments, then go for the 42V supplies (obtained from a 30+30V transformer).