Amplifier circuit TDA 1524A

Description

This amplifier can control the volume, balance and tone controls take over. The circuit operates a specially designed IC, LM 1036. The advantage is that few external components are necessary, and that may be, which are cheaper. Used for controlling monopotmeters speaks scheme for itself. S1 loudness can be adjusted. In the position shown, the loudness. Moreover, the IC TDA 1524A Philips same capabilities.

Circuit Diagram

Part list:

• R1-R4 = 47 k
• P1-P4 = 47 k
• C1 = 47 uF
• C2, C3 = 470 nF
• C4, C5, C16 = 10 nF
• C6, C7 = 10 uF
• C8, C9 = 390 nF
• C10-C13 = 220 nF
• C14, C15 = 4.7 uF
• IC1 = LM 1036

VU meter

This circuit can control analog moving coil meters, for use as a VU meter. The circuit is left connected to the line terminals of the amplifier. VU meter works pretty simple. T1 and T2 increase the signal strength. The signal is then rectified by the two diodes and applied to the meter. The capacitors C3 and C4 ensure that the voltage is slightly flattened and the meter responds less quickly.  After building the circuit, it must be calibrated. For this purpose, the VU meter connected to a tone generator which delivers 0.3V at 1000 Hz. Then P1 is fully open, that is to say that the wiper of P1 is located at the entrance. Then P2 is so cut that regulates the meter full deflection. P1 is then adjusted so that meter reads 0.5 mA (= half the maximum). 

For a stereo VU meter circuit to be built twice.

• R1 = 1 M
• R2 = 820 Ω
• R3 = 2,2 kohm
• P1, P2 = 100 k
• C1 = 330 nF
• C2 = 22 uF
• C3 = 1 uF
• C4 = 470 uF
• T1, T2 = BC 547B
• M1 = 1 mA meter

Subwoofer filter LM 741

Description for Subwoofer filter LM 741:

     If you like I want some more bass in your stereo, you can switch a subwoofer there. This is a speaker that only reflects the bass. Below is a circuit to ensure that the subwoofer gets really only the bass. 

This circuit is used between the signal source (mixer, CD player) and the amplifier. It is an active filter, better than passive filters which are generally mounted behind the amplifier. The circuit is mono because the bass for both channels are equal. The human ear can not yet determine the direction of this bass. 

The first 741 is used as a mixer amplifier. The gain is adjustable with P1. Then, the signal is applied to a second of the order Butterworth-filter. C A(C1 + C2) and C B (C3) can be calculate using the following formulas: where F k , the crossover frequency (the frequency at which filter stops the transmission of sound), pi = 3.1416, R = R3 = R4, F k in Hertz, and C. F. As shown, the filter is now set at 240 Hz. , the supply voltage must be symmetrical, + and - 12-15 V. A suitable diet is the Symmetric mini power supply . If you would like a better sound would have you two 741's replaced by an NE5532. The picture for the layout to be printed at 150DPI (= + / - 33x33mm).

Circuit Diagram:

subwoofer filter lm741 circuit diagram

Part-list:

• R1, R2 = 47 k
• R3, R4 = 4.7 K?
• R5, R6 = 100 Ω
• P1 = 47 k logarithmically
• C1-C3 = 100 nF
• IC1, IC2 = LM 741

Layout and PCB:

Subwoofer filter LM741 layout and pcb

Datasheet for LM741 and NE5532:
LM741 Operational Amplifier - Download
NE5532 Operational Amplifier - Download

Subwoofer Amplifier 40W

Description

This amplifier delivers massive power and uses one IC and two power transistors. The circuit consists of an amplifier IC (a TDA 2030A) and a power stage consists of two transistors.  Amplifier can be powered with an asymmetrical supply voltage of 12 to 44 V.

Circuit Diagram:

Subwoofer Amplifier 40W

Part-list:

• R1-R3, R7 = 100 K?
• R6 = 8,2 kW
• R4, R5, R8, R9 = 1.40 Ω 1%
• R10 = 1 Ω
• C1 = 470 nF
• C2 = 10 V μF/63
• C3 = 4.7 V μF/63
• C4, C5, C7 = 220 nF
• C6 = 2200 V μF/50
• C8 = 1000 V μF/50
• D1, D2 = 1N4001
• T1 = BD712 or BD912
• T2 = BD711 or BD911
• IC1 = TDA2030A
• LS = speaker - 4/8 Ω
• Cooling = Fisher SK08/75

Ultra-low quiescent current AF power amplifier

Power Amplifier 300W

POWER OUTPUT:

• 200W rms/8 ohm 
• 310W rms/4 ohm
• 800W rms/8 ohm (Bridge mode)

FREQUENCE RESPONSE 

• 20HZ-20KHZ +/-0.5dB 

INPUT SENSITIVITY 

• 1V for 200W/300W 

HUM AND NOISE

•  -105dB 

THD 

• <0.1% 

DAMPING FACTOR

•  65

Part list:

R1-19= 1Kohm 5W	R34-35= 0.1ohm 5W	C14-17= 100uF 100V
R2-3= 4.7Kohm	R36-43= 39ohm	C15= 100nF 250V polyester
R4-5= 22ohm	R37-42= 5.6Kohm 1W	Q1-2-3= BC547
R6-14= 10Kohm	R38-41= 220ohm 5W	Q4-5-6= BC557
R7-8= 1Kohm	R39-40= 0.1ohm 5W	Q7-11-12= BD140 or BC640
R9-23*=10K ohm	R44-45= 0.1ohm 5W	Q8= BC549
R10= 10ohm *see circuit sch.	R46= 4.7ohm 2W	Q9-10-15= BD139 or BC639
R11-13= 2.2Kohm	R47= 100ohm	Q13-14= MJ15004
R12= 22Kohm	C1= 2.2uF 25V	Q16-17= MJ15003
R15-16= 22ohm	C2-6= 330pF ceramic	TR1= 2K2 Trimmer
R17-18=  4.7Kohm	C3-8= 100uF 100V	F1-2= 5A Fuse Fast
R20-25= 390ohm	C4-9= 100nF 250V	D1-3= 5.1V 0.5W Zener
R21= 6.8Kohm	C5= 100nF 100V polyester	D2= 62V/5W Zener or 47v and 15V in series
R22=  4.7Kohm	C7= 100uF 25V	D4-5= 1N4004
R24-26-33= 220ohm	C10= 1.5nF 100V polyester	L1=10 turns diameter 1mm in 15mm diameter tube
R27-32= 100ohm 1W	C11-12= 1.5nF 100V polyester
R28,29,30,31= 100ohm	C13-16= 100nF 250V polyester	*Use R23=6k8 for 4 ohm loudspeakers

Audio amplifier 16 W

All resistors are 5 or 10 percent tolerance, 1/4-watt all capacitors are 10 percent tolerance, rated 35 volts or higher this circuit provides 16 watts of amplification. it is built using two LM383 power audio.

U1 U2	LM383 8 watt audio amplifier ic
R1, R3	220 ohm resistor
R2, R4	2.2 ohm resistor
R5	1 megohm resistor
R6	100k audio taper potentiometer
C1, C7	10uf electrolytic capacitor
C2, C5	470uf electrolytic capacitor
C3, C4, C6	0.2uf ceramic capacitor
SPKR1	4 to 8 ohm speaker (up to 8 inches diameter)