22 Watt Car Subwoofer Amplifier

Circuit Description

     The stereo signals coming from the line outputs of the car radio amplifier are mixed at the input and, after the Level Control, the signal enters the buffer IC1A and can be phase reversed by means of SW1. This control can be useful to allow the subwoofer to be in phase with the loudspeakers of the existing car radio. Then, a 12dB/octave variable frequency Low Pass filter built around IC1B, Q1 and related components follows, allowing to adjust precisely the low pass frequency from 70 to 150Hz. Q2, R17 and C9 form a simple dc voltage stabilizer for the input and filter circuitry, useful to avoid positive rail interaction from the power amplifier to low level sections.

     This unit is intended to be connected to an existing car stereo amplifier, adding the often required extra "punch" to the music by driving a subwoofer. As very low frequencies are omnidirectional, a single amplifier is necessary to drive this dedicated loudspeaker. The power amplifier used is a good and cheap BTL (Bridge Tied Load) 13 pin IC made by Philips (now NXP Semiconductors) requiring a very low parts count and capable of delivering about 22W into a 4 Ohm load at the standard car battery voltage of 14.4V.

Circuit Diagram

Parts list:

• 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

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%

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Car subwoofer filter circuit

Circuit description:

Here is the circuit diagram of a simple subwoofer filter that can be operated from a 12V DC supply. Such a circuit is very useful in automobile subwoofer applications. The circuit is nothing but a low pass filter whose pass frequency can be adjusted between 60 to 160 Hz. The circuit is designed around the TL072 dual BIFET opamp IC. Out of the two opamps inside the chip, IC1A is wired as a buffer. The left and right audio inputs after mixing is fed to the input of the IC1A using the DPDT switch S1. Switch S1 is the phase control switch which can be used to make the subwoofer in phase with other speakers. When S1 is in position 2, 180 degree phase shift will be induced.POT R7 can be used for controlling the level. IC1B forms the low pass filter whose pass frequency can be controlled by adjusting the dual gang POT R13.

Circuit Features:

• The circuit can be powered from 12V DC.
• IC1 must be mounted on a holder.
• S1 is a DPDT switch.
• R13 should be a dual gang linear POT.
• C5 and C6 must be polyester capacitors.
• POT R13 can be used for adjusting the pass frequency.
• POT R7 can be used for adjusting the level.

Circuit diagram:

Car subwoofer filter

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TDA7294 Amplifier Circuits

TDA7294 Audio Amplifier Circuits

TDA7294 is a monolithic integrated circuit in Multiwatt15 package, with high output power (up to 100W) intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Topclass TV). Thanks to the wide voltage range and to the high out current capability it is able to supply the highest power into both 4W and 8W loads even in presence of poor supply regulation, with high Supply Voltage Rejection.

TDA7294 Amplifier Circuits

TDA7294 Amplifier Circuits pcb

TDA7294 Amplifier Circuits layout

Subwoofer Amplifier Circuit 30W

 Subwoofer Amplifier Circuit 30W description:

     This circuit with 30w output Power circuit. This Amplifier circuit is very suitable for use in subwoofer amplifier system based on IC SI1030G. Amplifier has 30W output with 8 ohm impedance. Supply voltage required minimum of 12 volts and a maximum of up to 22 volts DC.

 Subwoofer Amplifier Circuit 30W Circuit diagram:

 Subwoofer Amplifier Circuit 30W

  Subwoofer Amplifier Circuit 30W Partlist:

R1 = 100K
R2 = 1R
C1 = 2.2uF
C2 = 100uF
C3 = 47uF
C4 = 100nF
C5 = 10uF
C6 = 47uF
C7 = 100uF
IC = SI1020GL , SI1030G

Audio Amplifier 1000W wtih active speaker

Audio Amplifier 1000W description:

I think you've seen or even have an active speaker and there is written 1500 watts PMPO (Peak Music Power Output), make no mistake this is different from Power Amplifier Active Speaker, I often dismantle such Active Speaker in it only a power with power no more than 150 watts by using the transformer 2-3 Ampere. PMPO is not a real power which is issued by the Power Amplifier, but counting all the speakers that there is, for example: if there are 5 pieces of speakers on each channel and each speaker has a power of 10 W then it is 100 W PMPO.

Audio Amplifier 1000W circuit diagram:

While this 1000 Watt Power Amplifier minimal use transformer 20 Ampere. And the output of Power AmplifierDC voltage contains approximately 63 volts, with currents and voltages of this magnitude, this 1000 Watt Power Amplifier will not hesitate hesitate to destroy your woofer speakers to connect. To overcome that then before the speaker on connects to 1000 Watt Power Amplifier must be in pairs Speaker Protector.

Actually if you want to create a Power Amplifier with great power does not have to make a Power Amplifier with great power. Example: you want to create a Power Amplifier with 10 000 Watt power. You do not have to assemble a Power Amplifier with power of 10,000 watts, but you assemble the power Power Amplifier Small but many, such as you assemble the Power Amplifier with 1000 Watts of power for as many as 10 pieces, it will produce 10 000 Watt Power Amplifier helpless.

Audio Amplifier 1000W parts

    Circuit uses power transistors pair of 5 x 5 x 2SA1216 and 2SC2922 and 2SC1583 use a differential amplifier that actually contains 2 pieces of transistors that are in containers together. Why use such built-in amplifier differental tujuanya so identical / similar, could have uses 2 separate transistors but can result in amplifier so it is not symmetrical.

Stereo Power Amplifier 3000W

Stereo Power Amplifier 3000W Description

This power amplifier circuit using a transistor amplifier from the front, signal splitter, driver and power amplifier. Current consumption required is quite large power amplifier that is 15-20 A 1500W power amplifier circuits for this. Supply voltage needed by the power of this amplifier is the optimal working order symmetrical 130VDC (130VDC-130VDC ground). 1500W amplifier circuit below is a picture series of mono, stereo if you want to make it necessary to make two copies of the circuit. For more details can be viewed directly image the following 1500W power amplifier circuit. In the above series of power amplifier 1500W is equipped to control a DC Offset function to set the power amplifier is turned on at the moment and with no input signal then the output should be 0VDC. Then also equipped with a flow regulator to the power amplifier bias. Final part of this power amplifier requires adequate cooling to absorb the heat generated. Power amplifier is not equipped with a speaker protector, therefore it is necessary diapsang protector on the speaker output so that when the power amplifier is not the case turned on the beat to the speaker that can damage the speaker. The 1N5404 diodes can withstand a peak non-repetitive current of 200A. Higher rated components may be used if desired. The voltage rating needs to be at least 400V.

Stereo Power Amplifier 3000W crcuit diagram

Stereo Power Amplifier 3000W

250 W Stereo Audio Amplifier Class-T

GENERAL DESCRIPTION:

The TA0103A is a 250W continuous average (4Ω ), two channel Amplifier Driver Module which uses Tripath’s proprietary Digital Power Processing (DPPT M ) technology. Class-T amplifiers offer bot h the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers. 

Applications:

• Audio/Video 
• Amplifiers/Receivers 
• Pro-audio Amplifiers 
• Automobile Power Amplifiers 
• Subwoofer Amplifiers 
• Home/PC Speaker Systems

Circuit Amplifier:

250 W Stereo Audio Amplifier Class-T

Recording/playback and 2 W audio power amplifier TDA1016

GENERAL DESCRIPTION:

The TDA1016 is a monolithic integrated audio power amplifier, preamplifier and A.L.C. circuit designed for applications in radio-recorders and recorders. The wide supply voltage range makes this circuit very suitable for d.c. and a.c. apparatus. The circuit incorporates the following features:

Features:

• Power amplifier/monitor amplifier
• Preamplifier/record and playback amplifier
• Automatic Level Control (A.L.C.) circuit
• Voltage stabilizer
• Short-circuit (up to 12 V a.c.) and thermal protection

Circuit diagram:

Recording/playback and 2 W audio power amplifier TDA1016

1 to 4 W audio power amplifier

General Description:

The TDA1015 is a monolithic integrated audio amplifier circuit in a 9-lead single in-line (SIL) plastic package. The device is especially designed for portable radio and recorder applications and delivers up to 4 W in a 4 Ω load impedance. The very low applicable supply voltage of 3,6 V permits 6 V applications. 1 to 4 W audio power amplifier

Special features:

• single in-line (SIL) construction for easy mounting
• separated preamplifier and power amplifier
• high output power
• thermal protection
• high input impedance
• low current drain
• limited noise behaviour at radio frequencies

Circuit Diagram:

1 to 4 W audio power amplifier circuit diagram

Datasheet for TDA1015: Download

100 Watt MOSFET Amplifier Circuit

Circuit Descpription

MOSFET based amplifiers as we all know are outstanding with their sound qualities and they can easilly beat the performance of other counterparts based on power transistors or linear ICs.

However amplifiers based on mosfets are not always easy to design or make.

Circuit Diagram

100 Watt MOSFET Amplifier Circuit

100W Audio Amplifier with MUTE/ST-BY

General description:

• VS - Supply Voltage (No Signal) ±50 V
• IO - Output Peak Current 10 A
• Ptot - Power Dissipation Tcase= 70°C 50 W
• Top - Operating Ambient Temperature Range 0 to 70 °C
• Tstg,- Tj Storage and Junction Temperature 150 °C

Amplifier circuit diagram

:

Layout circuit diagram

:

100w audio amplifier

General description:

 

All resistors are standard metal film 250mW except: R1/3/4/7, these are 2W metal film, and the 0.22ohm beeing 5W. Around R7 is wounded a 0.6mm isolated (enamelled) copper wire forming the output coil. (~12 windings)  For c19 i used 470uf/16v, all other electrolytics 63v. The 10/100/330pF should be mica-caps. The 100nf and 47nf is recommended to be Wima MKS2 (or better), also for C1 i suggest Wima MKS2, 4.7uf is enough. For Trimpot i use a Piher. The MPSA18 can be substituted by BC550C, for all other parts i do not recommend changes, especially the feedback network (r29/30) should be kept unchanged, feedback compensation is very delicate for this circuit ! Be careful when substituting the MPSA18 with BC550C, the pinout is reversed between these 2 transistors !!! The bias is adjusted via the trimpot (R22). Recommended bias is 55ma, resulting in 12mv across a single 0.22ohms or 24mv across both 0.22ohms. Connect a DMM to the upper wires of these resistors and adjust trimpot until DMM reads wanted voltage.

Features:

 

THD: ~0.005% (measured) sim'd: 0.002%
Power into 8ohm: 60 watts
Power into 4ohm: 100 watts
Gain: 32dB (~1:40) full output at 0.7v input (0.5v rms)
Feedback: 57dB
GainBandWidth: ~400Mhz
Slewrate: ~20v/us (symetrical)
Supply voltage: +/- 36v
Biasing: 55ma, ~12mv across a single 0.22 ohm
Measurings:The measuring setup itself is far from perfect, but gives a good idea !
Frequency response: 3.2hz to 145khz (-1db) using 4.7uf input cap
Phaseshift at 10khz: <3°
More will follow !

Circuit Diagram:

100w audio amplifier  circuit diagram

 

Layout Diagram:

100w audio amplifier  layout diagram

Partlist:

Device	Qty	Value	Notes
Q1,Q2	2	MPSA18	can be substituted by BC550C (pins reversed !)
Q7,Q8	2	BC546B	or maybe 2n5551 (pins reversed !)
Q3,Q9	2	2N5551	OnSemi/Fairchild/Philips
Q4,Q5,Q12	3	2N5401	OnSemi/Fairchild/Philips
T1	1	BD139	or bd135, bd135-16
U$5	1	MJE15030	OnSemi
U$6	1	MJE15031	OnSemi
U$3	1	MJL3281A	OnSemi
U$4	1	MJL1302A	OnSemi

Device	Qty	Value	Notes
C14	1	10pF (has been 22pF)	Mica
C2,C7	2	100pF	Mica
C3,C4	2	330pF	Mica
C18	1	47nF	Wima MKS2
C5, C6, C10, C11, C16, C17, C20	7	100nF	Wima MKS2
C1	1	10uF (4.7uF also fits)	Wima MKS2
C8,C9	2	100uF	Electrolytic 63v (at least 40v)
C19	1	470uF	Electrolytic 16v
C12,C13	2	1000uF	Electrolytic 63v (at least 40v)

Device	Qty	Value	Notes
R27,R28	2	0R22	5Watts
R1, R3	2	1R2	2Watts metal film
R4	1	4R7	2Watts metal film
R7	1	10	2Watts metal film
R2	1	10	250mW metal film
R8, R9	2	22	250mW metal film
R31, R32	2	47 (have been 22)	250mW metal film
R26	1	33	250mW metal film
R10	1	68	250mW metal film
R15,R17	2	150	250mW metal film
R11	1	220	250mW metal film
R24,R30	2	499 (or 500)	250mW metal film
R5,R6	2	680	250mW metal film
R13,R23	2	2k	250mW metal film
R12,R14,R29	3	22k	250mW metal film
R18,R20	2	47k	250mW metal film
R22	1	1k pot	Piher, small (470ohm might be better)

Device	Qty	Value	Notes
F1,F2	2	2.5T Fuse	Slow blow
F1,F2	2	---	Fuse holder
L1	1	---	0.6mm isolated (enamelled) copper wire wounded around R7 forming the output coil.