The SSM22111 is a high performance audio amplifier that delivers 1 W RMS of low distortion audio power into a bridge-connected 8 ? speaker load (or 1.5 W rms into a 4 ? load).

The SSM2211 operates over a wide temperature range and is specified for single-supply voltages between 2.7 V and 5.5 V. When operating from batteries, it continues to operate down to 1.75 V. This makes the SSM2211 the best choice for unregulated applications, such as toys and games.

Featuring a 4 MHz bandwidth and distortion below 0.2% THD + N @ 1 W, superior performance is delivered at higher power or lower speaker load impedance than competitive units. Furthermore, when the ambient temperature is at 25?C, THD + N < 1%, and VS = 5 V on a four-layer PCB, the SSM2211 delivers a 1.5 W output.

The low differential dc output voltage results in negligible losses in the speaker winding and makes high value dc blocking capacitors unnecessary. The battery life is extended by using shutdown mode, which typically reduces quiescent current drain to 100 nA.

Download the datasheet document of SSM2211 for 1.5W audio amplifier circuit reference:

SSM2211 Datasheet

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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

Here the Amplifier Circuit Diagram:

Here the PCB layout:

About LM12:
The LM12 is a power op amp capable of driving +25V at? +10A while operating from +30V supplies. The monolithic? IC can deliver 80W of sine wave power into a 4X load with? 0.01% distortion. Power bandwidth is 60 kHz. Further, a? peak dissipation capability of 800W allows it to handle reactive? loads such as transducers, actuators or small motors? without derating. Important features include:

• Input protection
• Controlled turn on
• Thermal limiting
• Overvoltage shutdown
• Output-current limiting
• Dynamic safe-area protection

Download the LM12 datasheet from below link:
[wpdm_file id=32]

Dynamic microphones are versatile and ideal for general-purpose use. They use a simple design with few moving parts. They are relatively sturdy and resilient to rough handling. They are also better suited to handling high volume levels, such as from certain musical instruments or amplifiers. They have no internal amplifier and do not require batteries or external power.

Schematic diagram:

Circuit Notes:

• This dynamic microphone amplifier circuit has a total gain of 200 times.
• If you use 200? microphones R4 must be 220? and C1 is 4.7uF.
• For the best performance, use metal film resistor, MKM type for unpolar capacitor and tantalum type for bipolar capacitor. Use stabled and regulated power supply.

With a 3mVpp input signal the output will be 800mVpp. The maximum output voltage was 10Vpp when the input is 50mVpp. The frequencies domain is between 50Hz and 100KHz.

Components List:

R1        : 39K 1/4 Watt Resistor
C1,C2     : 10uf 25V Electrolytic Capacitor
C3        : 100uf 25V Electrolytic Capacitor
C4        : 47uf 25V Electrolytic Capacitor
C5        : 0.1uf 25V Ceramic Capacitor
C6        : 2200uf 25V Electrolytic Capacitor
U1        : TDA1554Q Two Channel Audio Amp Chip
MISC      : Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input)

The? works best with 4 ohm speakers, but 8 ohm units will do. This circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The chip should run cool enough to touch with the proper heatsink installed.

Operated at 12 Volts and at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat. Printed circuit board is preferred, but universal solder or perf board will do. Keep lead length short.

The TDA1554Q is an integrated class-B output amplifier in a 17-lead single-in-line (SIL) plastic power package. The circuit contains 4 x 11 W single-ended or 2 x 22 W bridge amplifiers. The device is primarily developed for car radio applications.

Download TDA1554Q Datasheet Document:
[wpdm_file id=29]

There are possible alternative input stage transistors, the Toshiba 2SA970BL and 2SC2240BL, which appear to be good substitutes for the Hitachi 2SA1085E and 2SC2547E. The ‘BL’ suffix is the high gain group. Alternatives for the Sanyo 2SC2911 and 2SA1209 are the Toshiba 2SC3423 and 2SA1360.

This 70W power amplifier is designed for quality rather than quantity, and if much higher power is really needed there are other more suitable design approaches.

This is an awesome amplifier circuit, and this is the older version?(MJR7-Mk3). There is new version released (MJR7-Mk5) for better quality and performance, just go to THIS PAGE for complete circuit explanation.

Components list:

R1, R3 _________ 1K2 ohm
R2, R4 _________ 18 ohm
R5, R6 _________ 1 ohm
C1, C2 _________ 3u3 50V mini
C3 _____________ 22uF 16V
C5 _____________ 100uF 35V
C6, C7 _________ 220uF 10V
C10, C11 _______ 2200uF 35V
C4, C8, C9 _____ 100nF
IC _____________ TDA2009A
Heat sink

Circuit Specifications :

D.C. Input         : 8 ? 24V at 1 ? 2 A
Power output       : > 10W RMS /channel, 4 ohm load, 24V DC supply.
                     > 6W RMS /channel 8 ohm load 24V DC supply.
                     > 4W RMS /channel, 4 ohm load 12V DC supply.
S/N ratio          : > 75 dBA re. 10W output.
Frequency response : ~ 10 Hz to 50 kHz ?3 dB
Gain               : ~ 36 dB
Input level        : ~ 100 mV for full output

Circuit Works:
C1 & C2 are input coupling capacitors and block DC, as do C10 & C11 which are the output coupling capacitors, and C6 & C7 which block DC from the feed back loop. R1/R2 (and R3/R4) set the level of feed back.

The gain is equal to 1 +(R1/R2) = 68 or 37 dB. C8/R5 (and C9/R6) provide a high frequency load for stability where loudspeaker inductive reactance may become excessive. C4 and C5 provide power supply decoupling or filtering.

Kits:

The kits of this circuit is available at electronickits.com, you can order the kit there with online transaction.

Download 2x10W audio amplifier kit manual include the schematic diagram and the explanation:

10W Stereo Power Amplifier TDA2009A

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Download TDA2009A Datasheet Document:

TDA2009A Datasheet

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Components List:

Resistors :
R1, R2 ___________________ 2R2 ohm

Capacitors :
C1, C2, C4, C5, C6 _______ 100uF/16V electrolytic capacitor
C3 _______________________ 10uF/16V electrolytic capacitor
C7, C8, C12 ______________ 100nF
C9 _______________________ 2,200uF/25V electrolytic capacitor
C10 ______________________ 1uF/50V electrolytic capacitor
C11 ______________________ 100pF

Misc.
I.C. _____________________ HA13118
Heatsink

C10 is the input coupling capacitor and blocks DC from the input. C11 bypasses any RF which may be present at the input. C1 & C2 provide an AC ground for the inverting inputs of the IC. R1/C7 and R2/C8 provide a high frequency load for stability with difficult speakers. C5 and C6 provide “bootstrap” feedback for the IC. C9 and C12 provide power supply filtering. Don’t forget that heatsink is a must for this class AB power amplifier circuit.

18 Watt Audio Amplifier Specifications :

D.C. Input     : 8 ? 18V at 1 - 2 A
Power output   : 18W maximum, 4 ohm load, 18V DC supply
                 > 10W RMS 4 ohm load, 18V DC supply
                 > 5W RMS 8 ohm load 18V DC supply
                 > 6W RMS 4 ohm load 12V DC supply
S/N ratio      : > 70 dB
THD              < 0.2% @ 1W
Freq. Response : ~ 30 Hz to 30 kHz, ?3 dB
Input level    : < 25 mV, for full output (G > 50dB)
Input Impedance  ~ 30 k ohm

Download 18 Watt Audio Amplifier with HA13118 full explanation:

18W Power Audio Amplifier

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Download HA13118 datasheet:

HA13118 Datasheet

1 file(s) 53.06 KB

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Components List:

R1, R2 = 120 ohm
R3, R4 = 2R2 ohm

C1, C2, C11, C12 = 220nF nonpolar capacitor
C3, C4, C5, C6, C7, C8 = 47uF/16V electrolytic capacitor
C9,  C10 = 470uF/16V electrolytic capacitor

IC = BA5406

The BA5406 contains two sets of AF power amplifiers. It delivers 5W x 2 into 3 ohm loads with a 12V supply. The BA5406 has good low-voltage characteristics, and the “pop” sound when power is applied is small. It generates little radio-band noise, minimal RF radiation.

Recommended supply voltage: 5-15V max. Typical 12V. Ideally the power supply should be able to deliver over 2.5Amps. This means that a typical “cheap” plugin power supply (wall wart) will not be good enough. The power supply leads should be as short as possible. Quiescent current 20-70mA, typically 40mA.

Download the manual of 2x3W Audio Amplifier with IC BA5406 in PDF version:

3W Stereo Audio Amplifier

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Download the BA5406 datasheet:

BA5406 datasheet

1 file(s) 141.54 KB

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There are only a few external components, the IC? contains most of the necessary circuitry. C1, C5 are? the input coupling capacitors, which block any DC? that might be present on the inputs. C2, C9 maintain? DC bias levels in the gain adjustment (feed back)? circuit. C4 provides power supply decoupling, and? C6, C8 are the output coupling capacitors. C10, R1? and C11, R2 act as zobel networks providing a high? frequency load to maintain stability where loud speaker inductive reactance may become excessive.? The pot provides adjustable input level attenuation.

Components List:

Capacitors:
C1, C5 2.2 uF / 50Vecap _________ 2
C2, C9 10 uF / 25V ecap _________ 2
C3, C7 100 nF mono (104) ________ 2
C4 100 uF / 16V ecap ____________ 1
C6, C8 470 uF / 16V ecap ________ 2
C10, C11 47 nF mylar (473) ______ 2

Resistors :
R1, R2 10 ohm ___________________ 2
Pot 1 10k ohm stereo pot ________ 1

Misc. :
IC 1, 2 LM386N __________________ 2
8 pin IC socket _________________ 2

Download the complete explanation of 1W Stereo Audio Amplifier using LM386N:

1W Stereo Amplifier using LM386N

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Download the LM386N Datasheet:

LM386 Datasheet

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