Circuit audio amplifier TDA2040 base circuit

single electronic scheme 
Description 30 Watt audio amplifier  circuitry:. A 30-watt audio amplifier circuitry using TDA2040 is shown  here. TDA2040 is a monolithic class AB audio integrated amplifier available in Pentawatt package  The IC: has a low harmonic distortion, cross low is distortion and : has a built in protection circuitry for short circuit.  In the circuitry of two TDA2040 ICs are wired in BTL (Bridge Load tie) configuration to Provide 30W output in one 8 ohm speaker to + / -16V DC.  The capacitor C1 is the input DC decoupling capacitor.  Network comprenant components R2, C4, R3 Provides feedback to IC1 while R7, C6, R8 Network Provides information to the IC2. Network C5, C9 and R5, R9 Provides high frequency stability.  The C2, C3 filters the positive supply rail while the capacitors C7, C8 filters the negative supply rail. Single scheme electronic   circuitry diagram amplify Audio30 Watts:

 Notes:. A well-designed and good quality PCB Will Always Improve the sound  
 
quality. Use the + / -16V DC dual power supply to the power  
amplifier. Heat sinks are needed to IC1 and IC2  
Loads can be a speaker 8 ohms.  
C2 , C7 shoulds be Evaluated 25V electrolytic and others May be 10 or 15V.

20.000 Watt Audio Amplifier, Scheme collections circuit schematic with explanation

Collection of VersatileAudioAmplifier Number 2

Schema 20kW audio amplifier

Scheme 2000 Watt Audio Amplifier

Scheme 200 Watt Audio Amplifier

Scheme 20 Watt Audio Amplifier

layout PCB

Scheme 2 Watt Audio Amplifier

100W Hi-End Audio Amplifier SymAsym5 electronic schematics with explanation

Symasym5_3
Symasym5, is a "cute" power amplifier, designed with quality but still low price in mind. This resulted in a ClassAB BJT amplifier, using only TO92 transistors for input and VAS, with a reasonable part count. The topology used is well known and consist of a single diffamp for input, plus a 2nd diffamp with current mirror for VAS. This is followed by normal darlington EF outputstage using modern high beta devices. The circuit uses large amounts of feedback over the whole audioband and an unconventional feedback compensation scheme. Right now symasym is designed to be driven directly from a CD/DVD-player, simply place a 22k poslog stereo pot between player and symasym. (as voltage divider)

Update

The at least change is to reduce C14 from 22pF to 10pF, but i recommend to follow Pavel's advice.

I recommend C14 with 10pF also for MJLs, this increases safety margin.

Do not forget to read Pavel's Review! A very promising evaluation of the qualities to be expected from symasym. Thanks Pavel !

Another update are the resistors R31/32 to be increased from 22ohm to 47ohm.

Symasym5_3 is an update of v5.2, with an improved board layout concerning power gnd, resulting in lower thd for high frequencies, giving more clarity in sound. The Page for symasym5_2 still exists.

If the gain is too high because symasym is driven from preamp, R30 can be increased from 499ohms to 1k, but in this case R16/19 (22 or 33 ohms, not on schematic, REs to Q1/2) are required to keep feedback at same level and

 

Some Specs

• 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: RMAA Symasym5  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 span="">
• More will follow !

Schematic

Part List

Transistors:

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

Capacitors:

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)

Resistors:

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)

Miscellaneous:

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.

Recomended Part

• 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.

                                Symasym5 biasing: (for debugging)

Simple Light Audio Transmitter Circuit Schematic Diagram with explanation

This is the Simple Light Audio Transmitter Circuit Diagram. In the visible-light transmitter, a 7805 voltage regulator is connected in a variable-voltage configuration, and an audio signal is fed to the common input, to modulate the output voltage. The modulated output voltage is used to transmit intelligence via an incandescent lamp.
Simple Light Audio Transmitter Circuit Schematic Diagram with explanation

IC HT2844P based jet engine sound generator circuit

Description.

This jet engine sound generator circuit is based on the sound generator IC HT2844P from Holtek Semiconductors. This particular IC can make four sounds namely low speed sound of jet engine, high speed sound of jet engine, missile sound and machine gun sound. Each of these sounds can be activated by connecting the pins 12, 13, 14and 15 to ground by using the respective push button switches. Resistor R3 can be used for manually increasing or decreasing the speed.LED D1 gives a visible indication of the sound.

NOTES:

• The circuit can be powered from a 3V battery.
• Do not give more than 3.3V to the IC.
• K1 can be a 200mW/8 Ohm speaker.
• IC1 must be mounted on a holder.

S:circuitstoday.com

versatile voice modulator circuit using IC HT8950A

Description.
This is a very versatile voice modulator circuit using IC HT8950A from Holtek Semiconductors. The IC is capable of creating 7 upward or downward steps on the frequency of the input voice at a rate of 8Hz. There is also two special variation effects namely Vibrato mode and Robot mode. This circuit finds a lot of application in systems like telephone, speech processors, toys, mixers etc. A microphone is used to pick up the input voice. Push button switches S2 and S3 can be used for the upward and downward frequency stepping .Push button switch S1 can be used to activate Vibrato mode and push button switch S4 can be used to activate the Robot mode. IC HT82V733 (also from Holtek) is used to amplify the output of the voice modulator.LED D1 indicates the voice level.

NOTES:

• The circuit can be assembled on a Vero board.
• Do not give more than 4.5v to the circuit.
• Switches S1 to S4 can be miniature push button switches.
• S5 can be a miniature ON/OFF switch.
• K1 can be an 8 ohm speaker.
• IC1 and IC2 must be mounted on holders.

S:circuitstoday.com

VU Meter And audio mixer

This is audio mixer circuit. The circuit is for one channel input, if you need, for example 5 channel mixer, then you need to build 5 similar circuits.

TR1,2 = FCS9015 ; TR3 = C1213 ; IC1,2 = 741 or TL071

The kit of this circuit is available on the market, took the picture from electronic store in my town. This circuit is absolutely works.

S:electronicsuite.com