Showing posts with label amplifier. Show all posts
Showing posts with label amplifier. Show all posts
Monday, January 26, 2015
Low Cost Playback Amplifier For Cassette Deck
For some time now, there have been a number of tape cassette decks available at low prices from mail order businesses and electronics retailers. Such decks do not contain any electronics, of course. It is not easy to build a recording amplifier and the fairly complex magnetic biasing circuits, but a playback amplifier is not too difficult as the present one shows.
The stereo circuits in the diagram, in conjunction with a suitable deck, form a good-quality cassette player. The distortion and frequency range (up to 23 kHz) are up to good standards. Moreover, the circuit can be built on a small board for incorporation with the deck in a suitable enclosure. Both terminals of coupling capacitor C1 are at ground potential when the amplifier is switched on.
The stereo circuits in the diagram, in conjunction with a suitable deck, form a good-quality cassette player. The distortion and frequency range (up to 23 kHz) are up to good standards. Moreover, the circuit can be built on a small board for incorporation with the deck in a suitable enclosure. Both terminals of coupling capacitor C1 are at ground potential when the amplifier is switched on.
Cassette Deck Playback Amplifier Circuit Diagram:
Because of the symmetrical ±12 V supply lines, the capacitor will not be charged. If a single supply is used, the initial surge when the capacitor is being charged causes a loud click in the loudspeaker and, worse, magnetizes the tape. The playback head provides an audio signal at a level of 200–500 mV. The two amplifiers raise this to line level, not linearly, but in accordance with the RIAA equalization characteristic for tape recorders. Broadly speaking, this characteristic divides the frequency range into three bands:
- Up to 50 Hz, corresponding to a time constant of 3.18 ms, the signal is highly and linearly amplified.
- Between 50 Hz and 1.326 kHz, corresponding to a time constant of 120 µs, for normal tape, or 2.274 kHz, corresponding to a time constant of 70 µs, for chromium dioxide tape, the signal is amplified at a steadily decreasing rate.
- Above 1.326 kHz or 2.274 kHz, as the case may be, the signal is slightly and linearly amplified. This characteristic is determined entirely by A1 (A1’). To make the amplifier suitable for use with chromium dioxide tape, add a double-pole switch (for stereo) to connect a 2.2 kΩ resistor in parallel with R3 (R3’). The output of A1 (A1’) is applied to a passive high-pass rumble filter, C3-R5 (C3’-R5’) with a very low cut-off frequency of 7 Hz. The components of this filter have exactly the same value as the input filter, C1-R1 (C1’-R1’). The second stage, A2 (A2’) amplifies the signal ´100, that is, to line level (1V r.m.s.).
Saturday, November 15, 2014
100W MOSFET POWER AMPLIFIER
A 100W MOSFET power amplifier circuit based on IRFP240 and IRFP9240 MOSFETs is shown here. The amplifier operates from a +45/-45 V DC dual supply and can deliver 100 watt rms into an 8 ohm speaker and 160 watt rms into a 4 ohm speaker. This Hi-Fi amplifier circuit is suitable for a lot applications like general purpose amplifier, guitar amplifier, keyboard amplifier. The amplifier can be also used as a sub woofer amplifier but a subwoofer filter stage has to be added before the input stage. The amplifier has a low distortion of 0.1%, a damping factor greater than 200, input sensitivity of 1.2V and the bandwidth is from 4Hz to 4 KHz.
Circuit Diagram
About the Circuit
Capacitor C8 is the input DC decoupling capacitor which blocks DC voltage if any from the input source. IF unblocked, this DC voltage will alter the bias setting s of the succeeding stages. Resistor R20 limits the input current to Q1 C7 bypasses any high frequency noise from the input. Transistor Q1 and Q2 forms the input differential pair and the constant current source circuit built around Q9 and Q10 sources 1mA. Preset R1 is used for adjusting the voltage at the output of the amplifier. Resistors R3 and R2 sets the gain of the amplifier. The second differential stage is formed by transistors Q3 and Q6 while transistors Q4 and Q5 forms a current mirror which makes the second differential pair to drain an identical current. This is done in order to improve linearity and gain. Power amplification stage based on Q7 and Q8 which operates in the class AB mode. Preset R8 can be used for adjusting the quiescent current of the amplifier. The network comprising of capacitor C3 and resistor R19 improves high frequency stability and prevents the chance of oscillation. F1 and F2 are safety fuses.
Circuit Setup
Set R1 at midpoint before powering up and then adjust it slowly in order to get a minimum voltage (less than 50mV0 at the output. Next step is setting up the quiescent current and keep the preset R8 in minimum resistance and connect a multimeter across points marked X & Y in the circuit diagram. Now adjust R8 so that the multimeter reads 16.5mV which corresponds to 50mA quiescent current.
Notes
- Assemble the circuit on a good quality PCB.
- Use a +45/-45 V DC, 3A dual supply for powering the circuit.
- Power supply voltage must not exceed +55/-55 V DC.
- Before connecting the speaker, check the zero signal output voltage of the amplifier and in any case it should not be higher than 50mV. If it is higher than 50mV, check the circuit for any error. Replacing Q1, Q2 with another set could also solve the problem.
- Fit Q7 and Q8 to a 2°C/W heat sink. Both Q7 and Q8 must be isolated from the heat sink using mica sheets. Heat sink mounting kits for almost all power transistors/ MOSFETs of almost all package styles are readily available in the market.
- All resistors other than R10, R11 and R19 are 1/4 watt metal film resistors. R10 and R11 are 5W wire wound type while R19 is a 3W wire wound type.
Power Supply for the 100W MOSFET Power Amplifier
Tuesday, November 4, 2014
22Watt Car Subwoofer Amplifier
22W into 4 Ohm power amplifier, Variable Low Pass Frequency: 70 – 150Hz. 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.
22 Watt Car Subwoofer Amplifier Circuit Diagram:
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
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.
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.
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%
Monday, October 27, 2014
600 Watt Quasi Amplifier With Mosfet IRFP460
Two versions of a robust module capable of delivering high powwer for extended periods. The Actrk400 uses 6 n-channel Mosfets in the output stage to deliver around 400 watts into 4 ohms while the Actrk600 uses 12 n-channel Mosfets in the output stage to deliver power in excess of 600 watts into 4 ohms. One constructor has achieved almost 900 watts with the Actrk600 layout using 12 IRFP460 Mosfets.
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| 600 Watt Quasi Amplifier With Mosfet IRFP460 |
Wednesday, September 10, 2014
simple dynamic microphone amplifier
This is a schema Which can use as a dynamic microphone amplifier.This schema can handle 50Hz to 100Khz signals.
Note
# This schema is designed for use with 200 Ohm dynamic microphones. For usage with low impedance microphones, the value of R3 must be increased to around 47o Ohms and
# C1 must be decreased to around 2.2uF.
Tuesday, September 9, 2014
Subwoofer amplifier with 30W output power
Amplifier circuit is very suitable for use in subwoofer amplifier system based on IC SI1030G. Amplfier has 30W output with 8 ohm impedance. Supply voltage required minimum of 12 volts and a maximum of up to 22 volts DC.
Component List :
R1 = 100K
R2 = 1R
C1 = 2.2uF
C2 = 100uFC3 = 47uF
C4 = 100nF
C5 = 10uF
C6 = 47uF
C7 = 100uF
IC = SI1020GL , SI1030G
Power amplifier 450W with sanken
Circuit of power amplifiers with power output of 450 watts mono , amplifiers are also frequently used in the amplifier a high-power amplifier, which used in an event, in the field and the placed closed. Because this amplifier suitable for the woofer, fullrange speaker, and can also be fixed for the subwoofer speaker. To further strengthen and maximize the amplifier ,its power supply circuit also must be accurate, for electrolytic capacitors in power supply ,voltage capacitors use 80V or more, and a capcity 20000uF upwards, so when the bass amplifier is high , the voltage is not lot of experience dropping. Diode bridge use a minimum of 35A, or adjust the current input voltage. If the power supply has fulfilled the desire, the supply to the power amplifier.In the buffer circuit uses PNP transistor A1266 / A564 / A733 /A1015 / A798 and NPN with MJE340.To the driver circuit using PNP transistor MJE350 and MJE350. For the final amplifier circuit use two set 2SC2922 and 2SA1216. Use a quality sanken transistor to maximize quality sound output.Below is the amplifier and finshed PCB layout.
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| bottom view |
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| Top view |
If the track pcb does not look, you can download this series in the form of fort board, use the eagle cadsoft application to open it, but its components are not ordered , to their own satisfaction you can design it with your whishes.
Download file .brd here
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| Installation power amplifier |
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| This is power supply |
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| already amplifier |
Monday, September 8, 2014
LM2005 20 Watt Automotive Power Amplifier
General Description for LM2005:
Features for LM2005:
Wide supply range (8V –18V)
Externally programmable gain
With or without bootstrap
Low distortion
Low noise
High peak current capability
POe20W bridge
High voltage protection
AC and DC output short circuit protection to ground or across load
Thermal protection
Inductive load protection
Accidental open ground protection
Immunity to 40V power supply transients
3§C/W device dissipation
Pin for pin compatible with TDA2005
The LM2005 is a dual high power amplifier, designed to deliver optimum performance and reliability for automotive deliver optimum performance and reliability for automotive vice to deliver 10W/channel into 2X (LM2005T-S), or 20W bridged monaural (LM2005T-M) into 4X, with low distortion.
Features for LM2005:
Wide supply range (8V –18V)
Externally programmable gain
With or without bootstrap
Low distortion
Low noise
High peak current capability
POe20W bridge
High voltage protection
AC and DC output short circuit protection to ground or across load
Thermal protection
Inductive load protection
Accidental open ground protection
Immunity to 40V power supply transients
3§C/W device dissipation
Pin for pin compatible with TDA2005
Circuit diagram for LM2005:
Datasheet for LM2005: Download
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| LM2005 20 Watt Automotive Power Amplifier |
Datasheet for LM2005: Download
The pair of transistors power amplifier
Already Know about the transistor above? transistor above is one of the transistors that are applied at the amplifier end audio amplifiers. Because the power output and good quality of this transistor is very popular with high-power amplifier makers.
Transistors on no other than is 2SC2922 and 2SA1216, transistor pair is already very well known as a reliable amplifier. With a price not too expensive and not too large transistor large is also very suitable. And this transistor has its own code for its quality, its code is like 5DY, 57P, 85Y, 92P, etc.. to see datsheet transistor can be seen below.
Maximum Voltage 180V
maximum collector current 17A
Total power output 200W
To more clearly and accurately datasheet can be found here.
Sunday, September 7, 2014
20W Bridge Audio Amplifier based on TDA2005
This is 20W Bridge Audio Amplifier schema based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc.
This schema require Voltage input 18 VDC and will give you Output power - 20 W, 4 Ω
This is the amplifier kit:
This is the schematic:
To get the schematic diagram, component list and component layout, please download this file
Read More..
This schema require Voltage input 18 VDC and will give you Output power - 20 W, 4 Ω
This is the amplifier kit:
This is the schematic:
To get the schematic diagram, component list and component layout, please download this file
Saturday, September 6, 2014
TDA1009 Audio Amplifier 2 x 6 W
Description:
Vcc MIN (V)..........9 V
Vcc NOM (V)........14 V
Vcc MAX (V)........24 V
Pout (W)............2 x 6 W
R (Ohm).............4 Ohm
Tip case..............16-DIP+C
Circuit Diagram:
Vcc NOM (V)........14 V
Vcc MAX (V)........24 V
Pout (W)............2 x 6 W
R (Ohm).............4 Ohm
Tip case..............16-DIP+C
Circuit Diagram:
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| TDA1009 Circuit Diagram |
Friday, September 5, 2014
TDA7294 150 W Power Amplifier
This is power amplifier based on IC TDA7294 with output power 150W with 8 ohm impedance, source voltage + - 25V. for circuit see image below.
Read More..
| TDA7294 Power Amplifier |
Power amplifier circuit 60 W mono
Wow this is nice intregated amplifier circuit , because this IC can be power output up to 60 Watt . With minimum require voltage 8 V , and maximum voltage 35 V . But this circuit isnt so good to working on car , because output sound is very loud but not smooth. Amplifier so good working on full range , with speaker full range 100W and impedance 8 Ohm.Below it is schematic :
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| Click to view large |
The circuit above use IC AN7170 , the original output power IC is 20 W with impedance. But with use the circuit output elevated up to 60W.
Thursday, September 4, 2014
LM1875 20 Watt Audio Power Amplifier
To assemble the amplifier 20 watts with IC LM1875 component is not needed much support. 20 watts power amplifier using LM1875 IC in this article using symmetrical power supply. The series of 20 watts audio power amplifier with IC LM1875 can be used as an experiment or first project for the reader, because it is simple and assembly of high success.
| Schematic Amplifier LM1875 |
LM1875 amplifier circuit with the above may result in the strengthening of the voltage up to 27dB for each channel (1 channel 1 IC). Strengthening the voltage can be changed by changing the feedback that is R5 R (on the circuit above using R 22K). But the tension reinforcement can not be less than 20 dB because it can cause oscillation. For the power supply or power supply 20 watts power amplifier rngakaian with lm1875 can use travo 2-3A with CT.
5W power amplifier with IC TDA1016
This circuit use IC TDA1016 , minimum require voltage for this circuit 3 volt and maximum require voltage 15 volt .Its mono 5 Watt power output with impedance 4 Ohm , Current required 14 mA. In order for this circuit work optimally , the voltage should be at least 9 volts and the speakers should be higher 4 Ohm or equivalent, and use the speaker woofer. See Amplifier circuit schematic below :
Wednesday, September 3, 2014
Baxandall Tone Control Audio Amplifier
Description
This circuit exploits the high slew rate, high input impedance, and high output-voltage capability of CA3140 BiMOS op amp. It also provides mid-band unity gain with standard linear potentiometers.
Circuit Diagram
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| Baxandall Tone-Control Audio Amplifier |
Tuesday, September 2, 2014
TDA2005 Audio Amplifier 2x10w
TDA2005 description:
The TDA2005 is a class B dual audio power amplifier in Multiwatt11 package specifically designed for car radio applications. Power booster amplifiers can be easily designed using this device that provides a high current capability (up to 3.5 A) and can drive very low impedance loads (down to 1.6 in stereo applications) obtaining an output power of more than 20 W (bridge configuration). TDA2005 Audio Amplifier 2x10w
TDA2005 features:
High output power:Po = 10 + 10 W @ RL = 2 , THD = 10 %
Po = 20 W @ RL = 4 , THD = 10 %.
Protection against:
Output DC and AC short circuit to ground
Overrating chip temperature
Load dump voltage surge
Fortuitous open ground
Very inductive loads
Loudspeaker protection during short circuit for one wire to ground
TDA2005 circuit diagram:
TDA2005 layout:
STK4050V Power Amplifier Circuit
The project is based around the hybrid integrated circuit power amplifier with STK4050 manufactured by Sanyo to build a low clatter mono audio amplifier with complete peak quality. Explanation The project has a ceiling output power of 200W while incorporating a volume control. The power supplyused participating in the circuit is an on-board type and as of this, barely a hub tapped transformer is considered necessary in place of the powering of the circuit. The sound has a very fine quality and it can stay proven once used in to your place theaters, in computers, and other audio equipments which can as well be used being subwoofer amplifier. On behalf of water down-type audio sets, it can be considered as a compact package. The leg generated arrived thin-type audio sets is being discrete certainly with a good heatsink design. nearby may possibly live reason someplace a shock din may be encountered especially for the period of switch ON and switch inedible. This can be summary by only if a constant current circuit. The design of the circuit can be tailored used for sinking occurrence of thermal shutdown, brief circuit protection for oodles, shock racket muting from exterior power supply. The load resistance besupposed to arrange 8 Ohms profit with 55K Ohms input impedance.
Booster amplifier circuit
The above circuit is a circuit of booster amplifiers or amplifier end of a power amplifier circuit, Circuit over in the most important influence whether or not , and many more are affected in this final series. Because the booster circuit is the amplifier end of the work was too heavy components causing the rapid component of the heat. If we are wrong then consequences will install components that can cause fatal damaged direct component , such us the installation of pin emiter, collector , and base everything must be correct. In the circuit above can strengthen booster amplifier with maximum work and everything is evenly split, what is it evenly split ? evenly split the point here is that all components can work with the same voltage and the heat evenly , this is because at each respetive base transistor were given the same constrains and same wattage resistor. And to maintain if the power output is too large then the resistor on Re will hamper so that the transistor is not easily broken.
Part List :
Rb=10R/1W
Re=0,5-1R/5W
Q1=Transistor power NPN such us 2N3055 , TIP3055,TIP120,TIP142,2SC2922 , etc.
Q2=Transistor Power PNP such us MJ2955 ,TIP2955,TIP125,TIP147,2SA1216, etc.
X1=Voltage connector (-)
X2=PNP Base connector
X3=Speaker connecor but also must be connected from the buffer
X4=NPN base connector
X5=Voltage connector (+)
Monday, September 1, 2014
STEREO 300W 4Ω CLASS T DIGITAL AUDIO AMPLIFIER
GENERAL DESCRIPTION
The TA3020 is a two-channel, 300W (4Ω) per channel Amplifier Driver IC that uses Tripath’s proprietary Digital Power Processing (DPPTM) technology. Class-T amplifiers offer both the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers.
FEATURES
- Class-T architecture
- Proprietary Digital Power Processing technology
- “Audiophile” Sound Quality
- 0.02% THD+N @ 50W, 8Ω
- 0.03% IHF-IM @ 30W, 8Ω
- High Efficiency
- 95% @ 150W @ 8Ω
- 90% @ 275W @ 4Ω
- Supports wide range of output power levels
- Up to 300W/channel (4Ω), single-ended outputs
- Up to 1000W (4Ω), bridged outputs
- Output over-current protection
- Over- and under-voltage protection
- Thermally Enhanced 48-pin DIP (dual-inline package)
Circuit diagram:
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| STEREO 300W (4Ω) CLASS-T DIGITAL AUDIO AMPLIFIER |
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