70 Watt Guitar Amplifier

Guitar Amplifier description:

Guitar Amplifier parts list:

R1______________18K 1/4W Resistor

R2_______________3K9 1/4W Resistor

R3,R6____________1K 1/4W Resistors

R4_______________2K2 1/4W Resistor

R5______________15K 1/4W Resistor

R7______________22K 1/4W Resistor

R8_____________330R 1/4W Resistor

R9,R10__________10R 1/4W Resistors

R11,R12_________47R 1/4W Resistors

R13_____________10R 1W Resistor

C1_______________1µF 63V Polyester Capacitor

C2_____________470pF 63V Polystyrene or Ceramic Capacitor

C3______________47µF 25V Electrolytic Capacitor

C4______________15pF 63V Polystyrene or Ceramic Capacitor

C5_____________220nF 100V Polyester Capacitor

C6_____________100nF 63V Polyester Capacitor

 D1,D2,D3,D4___1N4148 75V 150mA Diodes 

Q1,Q2________BC560C 45V 100mA Low noise High gain PNP Transistors

Q3,Q4________BC556 65V 100mA PNP Transistors

Q5___________BC546 65V 100mA NPN Transistor

Q6___________BD139 80V 1.5A NPN Transistor

Q7___________BD140 80V 1.5A PNP Transistor

Q8__________MJ2955 60V 15A PNP Transistor

Mosfet Audio Amplifier 25W

General description:

Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. Q6 & Q7 must have a small U-shaped heatsink. Q8 & Q9 must be mounted on heatsink. Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter in series with Q8 Drain) with no input signal. A correct grounding is very important to eliminate hum and ground loops. Connect in the same point the ground sides of R1, R4, R9, C3 to C8. Connect C11 at output ground. Then connect separately the input and output grounds at power supply ground.

Amplifier circuit diagram:

Part list:

R1,R4 = 47K 1/4W Resistors R2 = 4K7 1/4W Resistors R3 = 1K5 1/4W Resistors R5 = 390R 1/4W Resistors R6 = 470R 1/4W Resistors R7 = 33K 1/4W Resistors R8 = 150K 1/4W Resistors R9 = 15K 1/4W Resistors R10 = 27R 1/4W Resistors R11 = 500R 1/2W Trimmer Cermet R12,R13,R16 = 10R 1/4W Resistors R14,R15 = 220R 1/4W Resistors R17 = 8R2 2W Resistor R18 = R22 4W Resistor (wirewound)

C1 = 470nF 63V Polyester Capacitor C2 = 330pF 63V Polystyrene Capacitor C3,C5 = 470µF 63V Electrolytic Capacitors C4,C6,C8,C11 = 100nF 63V Polyester Capacitors C7 = 100µF 25V Electrolytic Capacitor C9 = 10pF 63V Polystyrene Capacitor C10 = 1µF 63V Polyester Capacitor

Q1-Q5 = BC560C 45V100mA Low noise High gain PNP Transistors Q6 = BD140 80V 1.5A PNP Transistor Q7 = BD139 80V 1.5A NPN Transistor Q8 = IRF532 100V 12A N-Channel Hexfet Transistor Q9 = IRF9532 100V 10A P-Channel Hexfet Transistor

Power supply circuit diagram:

Part list:

R1 = 3K3 1/2W Resistor
C1 = 10nF 1000V Polyester Capacitor
C2,C3 = 4700µF 50V Electrolytic Capacitors
C4,C5 = 100nF 63V Polyester Capacitors
D1 200V 8A Diode bridge
D2 5mm. Red LED
F1,F2 3.15A Fuses with sockets
T1 220V Primary, 25 + 25V Secondary 120VA Mains transformer
PL1 Male Mains plug
SW1 SPST Mains switch

Low pass filter - Subwoofer

General description

     The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies. In the low frequencies is degraded the sense of direction. This reason us leads to the utilization speaker for the attribution of very low frequencies. The manufacture that to you we propose distinguishes these frequencies, in order to him we lead to the corresponding amplifier. The acoustic filters are met in various points in the sound systems. The knownest application they are the filters baxandal for regulating tone low and high frequencies and filters crossover where the acoustic region is separated in subareas, in order to it leads the corresponding loudspeakers. The application that to you we propose is a simple filter of region that limits the acoustic region (20-20000Hz) in the region 20-100Hz.

     With the manufacture that to you we propose you can make a active filter in order to you lead a loudspeaker of very low frequencies. With this you will place one bigger speaker between the HIFI speakers of you. In order to you have a complete picture of sound you will need also the corresponding amplifier. In the entry of circuit you will connect the two exits of preamplifier or the exit of line of some preamplifier. The circuit of manufacture allocates a exit in order to is led means of circuit of force subwoofer. If for some reason you do not have space in order to you place the third speaker in space of hearing, then you can select smaller speaker. The output will depend from the type of music that you hear. If in deed you have space, then after you make a filter and remain thanked, you can him recommend in your friends or still make other same for your friends.

Circuit diagram:

     In the form it appears the theoretical circuit of filter. In first glance we see three different circuits that are mainly manufactured round two operational amplifiers. This circuits constitute mixed, amplifier with variable aid and a variable filter. The manufacture end needs a circuit of catering with operational tendency of catering equal with ±12. the operational amplifiers that constitute the active elements for this circuits of are double operational type as the TL082 and NE5532. The operational these amplifiers belong in a family provided with transistor of effect of field IFET in their entries. Each member of family allocates in their circuit bipolar transistor and effect of field. This circuits can function in his high tendency, because that they use transistor of high tendency. Also they have high honor of rhythm of elevation (slew rate), low current of polarization for the entries and are influenced little by the temperature. The operational these amplifiers have breadth of area unity gain bandwidth 3MHz. A other important element for their choice is the big reject of noise, when this exists in the line of catering.

     The price of reject is bigger than 80dB, their consumption is small, from 11 until 3 mA. They are internally sold in nutshell with eight pins and allocate two operational amplifiers, In the same line in nutshell 14 pins they incorporate four operational, In the trade they are sold with code TL074, TL084 and TL064, In nutshell with eight pins they are sold operational amplifiers TL061 TL071 kajTL081. In the manufacture we used the TL082 that has two operational. First operational from the TL082 it works as amplifier and mixed for the two channels, In his negative entry he exists one small mixed with two resistances. A potentiometer in this rung determines the aid of circuit. In the point this left winger and the right channel of preamplifier they are added means of two resistances. En continuity the operational strengthens signal with aid made dependent from the price that has the potentiometer.

     The place of runner is proportional with the aid of circuit. The second operational amplifier is the filter of manufacture. The filter of is acoustic frequency of second class and he is made with the materials that are round the operational amplifier. The filter of is low passage with variable frequency of cutting off. This frequency can be altered and take prices from very low frequency the 30Hz or still exceed 150Hz. The frequency of cutting off of filter depends from the prices that have the elements of circuit. Altering the values of elements we can have frequency of cutting off 150Iz, 130Iz, J00Iz, 7Ïz, 6Íz even 3Íz, this prices they can be achieved with the simple rotation of double potentiometer. The circuit of filter has been made around one operational' that it has completed TL082 that is double operational amplifier. In the exit of filter we will link the plug of expense where is connected the amplifier. In the exit of circuit is presented, the limited as for the breadth of frequencies, signal that we apply in the entry of circuit.

Part list:

R1 = 39 Kohm 

R2 = 39 Kohm

R3 = 47 Kohm 

R4 = 10 Ohm

R5 = 22 Kohm 

R6 = 4,7 Kohm

R7 = 22 Kohm 

R8 = 4,7 Kohm

R9 = 10 Ohm 

R10 = 220 Ohm

C1 = 39 pF 

C2 = 0.1 uF

C3 = 0.1 uF 

C4 = 0.2 uF

C5 = 0.4 uF 

C6 = 0.1 uF

C7 = 0.1 uF 

IC1 = TL064

PCB and layout:

 

  

Detail of subwoofer

Variations in the anatomy of a subwoofer dramatically changes their performance characteristics. An increase in voicecoil size coupled with a stronger cone material yields a higher power handling and increased output. By combining quality materials with Rockford’s proprietary acoustic technologies, our subwoofer lineup is sure to meet your system’s demands.

Basket - Also referred to as the frame or chassis, this is the skeletal system of the speaker. Here to keep everything in its place.

Spider - Second part of the speakers suspension, connects the cone and voice coil to the basket and controls the travel of the cone assembly.

Voice Coil - The brains of the operation, directing the force from the magnet to push or pull based on the applied electrical signal.

Surround - First part in the speakers suspension, attached to the cone to maintain the centering of the voice coil in the magnetic gap.

Cone - A.K.A the diaphragm, this is the voice of the speaker. Shape and material dramatically change tonality.

Magnet - The heart of speaker, creating the force to push and pull cone assembly. Size, material, and design may differ, depending on performance goals.

Original sourse article rockfordfosgate.com

MAX98500 Amplifier circuit 1x2.2W

MAX98500 general description:

The MAX98500 is a high-efficiency Class D audio amplifier that features an integrated boost converter, to deliver a constant output power over a wide range of battery supply voltages. The boost converter operates at 2MHz, requiring only a small (2.2µH) external inductor and capacitor. The automatic level control has a battery tracking function that reduces the output swing as the supply voltage drops, preventing collapse of battery voltage. The amplifier has differential inputs and an internal fully differential design. The MAX98500 also features three gain settings (6dB, 15.5dB, and 20dB) that are selectable with a logic input. The MAX98500 is available in a small, 0.5mm pitch 16-bump WLP package (2.1mm x 2.1mm). It is specified over the extended -40°C to +85°C temperature range.

MAX98500 applications:

Active Speaker Accessories

Cell Phones

GPS Devices

Mobile Internet Devices

Smartphones

Data Sheet

MAX98500 features:

Boosted Class D Output

Integrated Automatic Level Control

Output Power

2.2W into 8Ω, 10% THD+N

1.7W into 8Ω, 1% THD+N

Wide 2.5V to 5.5V Supply Voltage Range

Undervoltage Lockout Protection

High Total Efficiency of 87%

High Step-Up Switching Frequency (2MHz)

Active Emission Limiting for Low EMI 

MAX98500 circuit diagram:

MAX98500 circuit diagram

LA3600 Equalizer 5 band

Applications:

• Portable component stereos, tape-recorders, radio-cassette recorders, car stereos.

Features:

• On-chip one operational amplifier.
• 5-band graphic equalizer for one channel can be formed easily by externally connecting capacitors and variable resistors which fix fo (resonance frequency).
• Series connection of two LA3600’s makes multiband (6 to 10 bands) available.
• Highly stable to capacitive load.

LA3600 Circuit diagram:

LA3600 Circuit diagram

 LA3600 pcb:

LA3600 pcb

TDA8927/TDA8929 Audio Amplifier 2x80W

TDA8927/TDA8929 general description:

The TDA8927 is the switching power stage of a two-chip set for a high efficiency class-D audio power amplifier system. The system is split into two chips:

TDA8927J/ST/TH; a digital power stage in a DBS17P,
RDBS17P or HSOP24 power package
TDA8929T; the analog controller chip in a SO24package.

With this chip set a compact 2 × 80 W audio amplifier system can be built, operating with high efficiency and very low dissipation. No heatsink is required, or depending on supply voltage and load, a very small one. The system operates over a wide supply voltage range from ±15 up to ±30 V and consumes a very low quiescentcurrent.

TDA8927/TDA8929 features:

• High efficiency (>94%)
• Operating voltage from ±15 to ±30 V
• Very low quiescent current
• High output power
• Short-circuit proof across the load, only in combination with controller TDA8929T
• Diagnostic output
• Usable as a stereo Single-Ended (SE) amplifier or as a mono amplifier in Bridge-Tied Load (BTL)
•  Electrostatic discharge protection (pin to pin)
• Thermally protected, only in combination with controller TDA8929T.

TDA8927/TDA8929 applications:

• Television sets
• Home-sound sets
• Multimedia systems
• All mains fed audio systems
• Car audio (boosters).

TDA8927/TDA8929 circuit diagram:

TDA8927/TDA8929 layout and pcb: