Simple Audio Pre-Amplifier This simple circuit provides good gain to too audio singnals .Use it in main of an RF oscillators to make an RF transmitter that is very sensitive to sound
Showing posts with label amplifier. Show all posts
Showing posts with label amplifier. Show all posts
Thursday, November 20, 2014
230 400 Watt Power Amplifier MOSFET
Amplifier circuit below is a series of amplifiers with the amplifier transistor and mosfet. This amplifier output power ranging from 230W up to 400W.
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| 230 - 400 Watt Power Amplifier |
Wednesday, November 19, 2014
Tuesday, November 18, 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.
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| TDA7294 Power Amplifier |
Monday, November 17, 2014
10W Audio Amplifier with Bass boost
This Audio Amplifier design is based on the audio amplifier 18 watts, and was developed primarily to meet the requests of correspondents unable to locate the chip TLE2141C. It uses the NE5532 Dual IC wide, but obviously, its power output will be written in the 9.5 - 11.5W range, as the supply rails can not exceed ± 18V.
As amplifiers of this type are often used to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. Therefore, a Bass Boost control was inserted in the amplifier feedback loop, in order to overcome this problem, without loss of quality. The low elevation curve can reach a maximum of 16.4 dB @ 50Hz. In any case, even when the bass control is turned fully counterclockwise, the amplifiers frequency response curve shows a gentle rise: 0.8 dB at 400 Hz, 4.7 dB at 100 Hz and 6 dB at 50 Hz (referred to 1 kHz).
As amplifiers of this type are often used to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. Therefore, a Bass Boost control was inserted in the amplifier feedback loop, in order to overcome this problem, without loss of quality. The low elevation curve can reach a maximum of 16.4 dB @ 50Hz. In any case, even when the bass control is turned fully counterclockwise, the amplifiers frequency response curve shows a gentle rise: 0.8 dB at 400 Hz, 4.7 dB at 100 Hz and 6 dB at 50 Hz (referred to 1 kHz).
High Gain Crystal Earphone Amplifier
This simple, one-transistor amplifier provides a voltage accretion over 1000 (60 dB) for active a aerial impedance bowl (crystal) earphone. The aerial accretion is accomplished by replacing the acceptable beneficiary resistor with an abnormal constant-current diode that food 1/2 mA yet exhibits a actual aerial attrition to the audio. This amplifier will accord accomplished array life, cartoon alone 500 uA.
Below is a archetypal appliance application it with the aboriginal clear radio ambit on this page. The amplifier provides acceptable aggregate with a bashful antenna. You may appetite a aggregate ascendancy as with the TL431 project! Or use the Crystal Radio RF Amplifier directly above for even more sensitivity with less than 2 mA current drain.
Friday, November 14, 2014
100W AUDIO AMPLIFIER USING TDA7294
TDA7294 is an integrated, monolithic, Class AB audio amplifier designed specifically for Hi-Fi applications. The IC has a DMOS output stage and can deliver 100W RMS into an 8Ohm speaker at +/-38V dual supply. The TDA7294 has low noise, low distortion, good ripple rejection and can be operated from a wide range of supply voltages. The IC has built in short circuit protection and thermal shutdown circuitries. The IC is available in multiwatt 15V and multiwatt 15H packages.
Description
In the circuit TDA7294 is configured to provide 100W output power into an 8Ohm loudspeaker at +/- 38V supply. C8 is the input coupling capacitor and the input is applied to the non-inverting input (Pin3) of the IC. C3 and C9 are power supply filter capacitors while C10 and C4 are bypass capacitors. C2 is the bootstrap capacitor. RC network comprising of R1 and C1 improves the high frequency stability of the amplifier and also prevents oscillations. R2 and C6 sets the mute time constant while R3 and C5 sets the standby time constant. S1 and the mute switch and S2 are the standby switch. R5 is the input resistance and the amplifiers input impedance has a direct relationship to its value. R4 and R6 is used for setting type closed loop gain and with the used value, gain is 30dB. C2 is a feedback capacitor and it also provides DC decoupling.
Circuit Diagram
Notes
- The supply voltage range is +/- 10V to =/-40V DC.
- Heat sink is required and its thermal resistance should be around 0.038 degree Celsius/Watt.
- Use an 8 Ohm 150W speaker as the load.
- For 100W output the supply voltage must be +/-38VDC.
- The power supply must be well filtered and free of ripples.
- If ripples are present in the power supply it may cause oscillations.
- VM = 1.5V is the mute ON threshold and VM=3.5V is the mute OFF threshold.
- VSTBY = 1.5V is the standby on threshold and VSTBY = 3.5V is the standby OFF threshold.
- Typical input resistance of TDA7294 is 100KiloOhm.
- Frequency response is 20Hz to 20KHz.
- 145 degree Celsius is the threshold for thermal shutdown. Slew rate of TDA7294 is 10V/microsecond and the open loop voltage gain is 80 dB.
- Quiescent current of TDA7294 is approximately 30mA and its maximum value is 65mA.
Saturday, November 8, 2014
Saturday, October 18, 2014
Simple 100W Guitar Pre Amplifier Circuit Diagram
This is a simple Simple 100W Guitar Pre-Amplifier Circuit Diagram. Guitar amplifiers are always an fascinating challenge. The tone controls, gain & overload characteristics are individual, & the ideal combination varies from guitarist to the next, & from guitar to the next. There is no amp that satisfies everyones requirements, & this offering is not expected to be an exception. The preamp is now at Revision-A, & although the whole schematic of the new version is not shown below, the essential characteristics are not changed - it still has the same tone control "stack" & other controls, but now has a second op amp to reduce output impedance & improve gain characteristics.
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If the bright switch is bright ( much treble), increase the 1k resistor (R5) to tame it down again. Reduce the worth to get more bite. The tone control arrangement shown will give zero output if all controls are set to maximum - this is unlikely to be a common requirement in use, but be aware of it when testing.
The input, effects & output connections are shown in Figure 1B.
The connections shown are similar (ok, virtually identical :-) to those used in my prototype. Noise is low, & probably might have been lower if I had made the amp a tiny bigger. All connectors must be fully insulated types, so there is no connection to chassis. This is important ! You will notice from the above diagram that I didnt include the "loop breaker" circuit shown in the power supply diagram. For my needs, it is not necessary, for your needs, I shall let you pick. In case you select to make use of it, then the earth (chassis) connection marked * (next to the input connectors) must be left off. A few important points The main 0 volt point is the connection between the filter caps.
This is the reference for all zero volt returns, including the 0.1 ohm speaker feedback resistor. Dont connect the feedback resistor directly to the amps GND point, or you will generate distortion & feasible instability. The supply for the amp & preamp must be taken directly from the filter caps - the diagram above is literal - that means that you follow the path of the wiring as shown. Although mentioned above, you might well ask why the pots dont mount directly to the PCB to save wiring. Simple . Had I done it that way, you would require to make use of the same type pots as I designed for, & the panel layout would must be the same , with the exact same spacings. I figured that this would be limiting, so wiring it is. The wiring actually doesnt take long & is simple to do, so is not an issue. I didnt include the "Bright" switch in Figure 1B for clarity. I expect that it will cause few issues.
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One major difference from any "store bought" amplifier is that in case you build it yourself, you can alter things to fit your own needs. The ability to experiment is the key to this circuit, which is although introduced in complete form, there is every expectation that builders will make modifications to suit themselves.
The amp is rated at 100W in to a four Ohms load, as this is typical of a "combo" type amp with 8 Ohm speakers in parallel. Alternatively, you can run the amp in to a "quad" box (four x 8 Ohm speakers in series parallel - see Figure five in Project 27b, the original editorial) and will get about 60 Watts. For the adventurous, two quad boxes and the amp head will provide 100W, but will be much louder than the twin. This is a common combination for guitarists, but it does make it hard for the sound man to bring everything else up to the same level.
The Pre-Amplifier
A picture of the Revision-A preamp is shown below. Youll see that theres dual op amps, but the schematic only shows. This is the main part of the Rev-A update - the output section now has gain (which is basically selected), and a better buffered low output impedance. The remainder of the circuit is unchanged.
Guitar Pre-Amplifier Board
The preamp circuit is shown in Figure one, and has a few fascinating characteristics that separate it from the "normal" - assuming that there is such a thing. This is simple but elegant design, that provides excellent tonal range. The gain structure is designed to provide a immense amount of gain, which is ideal for those guitarists who like to get that fully distorted "fat" sound.
However, with a couple of simple changes, the preamp can be tamed to suit any style of playing. Likewise, the tone controls as shown have sufficient range to cover very anything from an electrified violin to a bass guitar - The response can be limited in the event you wish (by experimenting with the tone control capacitor values), but I recommend that you try it "as is" before making any changes.
Figure 1 - Guitar Pre-Amplifier
From Figure one, you can see that the preamp makes use of a dual op amp as its only amplification. The lone transistor is an emitter follower, & maintains a low output impedance after the master volume control. As shown, with a typical guitar input, it is feasible to receive a fat overdrive sound by winding up the volume, & then setting the master for an appropriate level. The general frequency response is deliberately limited to prevent extreme low-end waffle, & to cut the extreme highs to help reduce noise & to limit the response to the normal requirements for guitar. In case you use the TL072 op amp as shown, you may find that noise is an issue - at high gain with lots of treble boost. I strongly recommend that you use an OPA2134 - a premium audio op amp from Los angels Instruments (Burr-Brown division), you will then find this possibly the quietest guitar amp you have ever heard (or not heard :-). At any gain setting, there is more pickup noise from my guitar than circuit noise - & for the prototype one used carbon resistors!
Notes:
one - IC pin outs are industry standard for dual op amps - pin four is -ve supply, and pin 8 is +ve supply.
two - Op amp supply pins must be bypassed to earth with 100nF caps (preferably ceramic) as close as feasible to the op amp itself.
three - Diodes are 1N4148, 1N914 or similar.
four - Pots ought to be linear for tone controls, & log for volume and master.
one - IC pin outs are industry standard for dual op amps - pin four is -ve supply, and pin 8 is +ve supply.
two - Op amp supply pins must be bypassed to earth with 100nF caps (preferably ceramic) as close as feasible to the op amp itself.
three - Diodes are 1N4148, 1N914 or similar.
four - Pots ought to be linear for tone controls, & log for volume and master.
The power supply section (bottom left corner) connects directly to the main +/-35V power amp supply. Use one Watt zen-er diodes (D5 and D6), and make positive that the zen-er supply resistors (R18 and R19, 680 ohm one Watt) are kept away from other parts, as they will get warm in operation. Again, the preamp PCB accommodates the supply on the board.
The pin connections shown (either huge dots or "port" symbols) are the pins from the PCB. Normally, all pots would be PCB types, and mounted directly to the board. For a do-it-yourself project, that would limit the layout to that imposed by the board, so all connections use wiring. It may look a bit hard, but is simple and looks fine when the unit is done. Cable ties keep the wiring tidy, and only a single connection to the GND point ought to be used(several are provided, so select that suits your layout. VCC is +35V from the main supply, and VEE is the -35V supply.
In the event you dont require all the gain that is available, basically increase the worth of R6 (the first 4k7 resistor) - for even less noise and gain, increase R11 (the second 4k7) as well. For more gain, decrease R11 - I recommend a maximum of 2k2 here.
If the bright switch is bright ( much treble), increase the 1k resistor (R5) to tame it down again. Reduce the worth to get more bite. The tone control arrangement shown will give zero output if all controls are set to maximum - this is unlikely to be a common requirement in use, but be aware of it when testing.
The diode network at the output is designed to permit the preamp to generate a "soft" clipping characteristic when the volume is turned up. Because of the diode clipping, the power amp needs to have an input sensitivity of about 750mV for full output, otherwise it wont be feasible to get full power even with the Master gain control at the maximum setting.
Make positive that the input connectors are isolated from the chassis. The earth isolation parts in the power supply help to prevent hum ( when the amp is connected to other mains powered equipment).
If issues are encountered with this circuit, then you have made a wiring mistake .. period. A golden rule here is to check the wiring, then keep on checking it until you find the error, since I can assure you that if it does not work properly there is at least mistake, & probably more.
The input, effects & output connections are shown in Figure 1B.
Figure 1B - Internal Wiring
This is the reference for all zero volt returns, including the 0.1 ohm speaker feedback resistor. Dont connect the feedback resistor directly to the amps GND point, or you will generate distortion & feasible instability. The supply for the amp & preamp must be taken directly from the filter caps - the diagram above is literal - that means that you follow the path of the wiring as shown. Although mentioned above, you might well ask why the pots dont mount directly to the PCB to save wiring. Simple . Had I done it that way, you would require to make use of the same type pots as I designed for, & the panel layout would must be the same , with the exact same spacings. I figured that this would be limiting, so wiring it is. The wiring actually doesnt take long & is simple to do, so is not an issue. I didnt include the "Bright" switch in Figure 1B for clarity. I expect that it will cause few issues.
Friday, October 17, 2014
Latest New Motorola Hi Fi power amplifier
This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like it?s shown in the table (from 20 W to 80 W RMS).
Some comments:
- The first thing that you must do, is to measure the end transistors (T3 and T4) amplifying coefficient, the hfe or ?. If their disagreement is bigger than 30 %, the amplifier would not give a clear sound. I used MJ3001 and MJ2501 transistors, and this disagreement was around 5%.
- Before the first ?turning on? you must short circuit the inputs of the amp, and put a mA-meter on the output, than turn the amplifier on, and tune the R13 pot, to decrease the DC current on the output, to some uA-s, or in a lucky situation to zero. I was able to decrease it to 10 uA.
Thursday, October 16, 2014
Simple 30 Watt VHF Amplifier by using 2SC1946A
The 30 watt amplifier schematic shown below provides an appropriate power boost with an input of 4 watt up to 6 watts. The circuit is designed to cover 88-108MHz FM Broadcast Band. However, the circuit is very stable at my place and provides a clean-output through seven (7) element Butter-worth low-pass filter.
Circuit Diagram:
Notes:
The heart of the circuit is 2SC1946A VHF RF power transistor. The transistor is specifically designed for operation in frequencies up to 175 MHz, with very good results. As you can see, the power line is well decoupled. The amplifier current can be over 5 amps. All the coils are made from 16gauge laminated wire (or Silver copper wire can do best) and the RFC can be of HF toroid core (as shown in the picture) or 6 holes ferrite bead.C3 and R1 forms snubber circuit while R2 and C6 prevent the amplifier from self-oscillation at VHF, sometimes you need to add 180 ohms in parallel with L7.That will cause the amplifier to dissipate UNDESIRABLE VHF thereby reducing spurious level.
The photo below is 60Watts VHF power amplifier using the above circuit. Two of 2SC1946A transistors are arranged at 90 degrees to each other and their outputs are combined using "Power Combiner Network”. It is quite difficult to combine powers at VHF and UHF bands.
However, I recommend that hobbies should stick to single power design due to its complicity and large rate of INTERFERENCE. (in attempt to go for double transistors which involves power combiner network). Since the two amplifiers are operating in different phase (out of phase).
Tuning:
Tuning of the amplifier is not hard at all. You just have to connect the output to a good antenna with a transmission line (RG214) of 50 ohms. First match the output network, and then do the same to the input network for a maximum power output. By way of adjustment, you can increase the output at its operating frequency.
Circuit Diagram:
Notes:
The heart of the circuit is 2SC1946A VHF RF power transistor. The transistor is specifically designed for operation in frequencies up to 175 MHz, with very good results. As you can see, the power line is well decoupled. The amplifier current can be over 5 amps. All the coils are made from 16gauge laminated wire (or Silver copper wire can do best) and the RFC can be of HF toroid core (as shown in the picture) or 6 holes ferrite bead.C3 and R1 forms snubber circuit while R2 and C6 prevent the amplifier from self-oscillation at VHF, sometimes you need to add 180 ohms in parallel with L7.That will cause the amplifier to dissipate UNDESIRABLE VHF thereby reducing spurious level.
The photo below is 60Watts VHF power amplifier using the above circuit. Two of 2SC1946A transistors are arranged at 90 degrees to each other and their outputs are combined using "Power Combiner Network”. It is quite difficult to combine powers at VHF and UHF bands.
However, I recommend that hobbies should stick to single power design due to its complicity and large rate of INTERFERENCE. (in attempt to go for double transistors which involves power combiner network). Since the two amplifiers are operating in different phase (out of phase).
Tuning:
Tuning of the amplifier is not hard at all. You just have to connect the output to a good antenna with a transmission line (RG214) of 50 ohms. First match the output network, and then do the same to the input network for a maximum power output. By way of adjustment, you can increase the output at its operating frequency.
Thursday, September 18, 2014
TDA7265 Audio Amplifier 2x25W
TDA7265 description:
The TDA7265 is class AB dual Audio Amplifier assembled in the multi watt package specially designed for high quality sounds application as Hi-Fi music centers and stereo TV sets
TDA7265 features:
WIDE SUPPLY VOLTAGE RANGE (UP TO±25V ABS MAX.)
SPLIT SUPPLY
HIGH OUTPUT POWER 25 + 25W @ THD =10%, RL = 8Ω, VS = +20V
NO POP AT TURN-ON/OFF
MUTE (POP FREE)
STAND-BY FEATURE (LOW Iq)
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
TDA7265 amplifier circuit:
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The TDA7265 is class AB dual Audio Amplifier assembled in the multi watt package specially designed for high quality sounds application as Hi-Fi music centers and stereo TV sets
TDA7265 features:
WIDE SUPPLY VOLTAGE RANGE (UP TO±25V ABS MAX.)
SPLIT SUPPLY
HIGH OUTPUT POWER 25 + 25W @ THD =10%, RL = 8Ω, VS = +20V
NO POP AT TURN-ON/OFF
MUTE (POP FREE)
STAND-BY FEATURE (LOW Iq)
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
TDA7265 amplifier circuit:
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| TDA7265 amplifier circuit |
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| TDA7265 pcb |
Wednesday, September 17, 2014
BC549C and BC547B Microphone amplifier
BC549C and BC547B microphone general description:
The preamplifier amplifies the output signal of a microphone, so that it can be. The further amplified by a power amplifier The circuit supplies the output to a signal line. With two transistors, it is not difficult to build such a circuit. The amplifier produces little noise. In the shown embodiment, the circuit is suitable for microphones 500 and 600 Ω. 200 Ω R1 microphones should be reduces to 220 Ω and C1 should be increased to 4.7 uF. The gain is set by R2. If the average declared value of 22 K? Can be used. The maximum gain is about 200 times.BC549C and BC547B microphone circuit:
BC549C and BC547B microphone part list:
R1 = 470 Ω
R 2 = 22 K?
R3 = 12 K?
R4 = 47 k
R5 = 820 Ω
R6 = 100 Ω
R7 = 1 k
R8 = 100 k
C1, C4 = 2.2 V μF/16
C2 = 47 V μF/16
C3 = 470 nF
T1 = BC 549C
T2 = BC 547B
R 2 = 22 K?
R3 = 12 K?
R4 = 47 k
R5 = 820 Ω
R6 = 100 Ω
R7 = 1 k
R8 = 100 k
C1, C4 = 2.2 V μF/16
C2 = 47 V μF/16
C3 = 470 nF
T1 = BC 549C
T2 = BC 547B
Tuesday, September 16, 2014
Mixed connection acoustics bi amplifier and the output fader
In the operation is still a lot of these "dinosaurs" of the mid 90s. A characteristic feature of built-in amplifiers such devices - they are designed for load 2 ohms and have a good supply of power. This is due to the fact that in the middle position fader front and surround speakers are connected in parallel. However, to use them in conjunction with acoustic component is impossible. The reason is simple - the introduction of the fader increases the output impedance of the amplifier, which leads to a change in crossover. Therefore, the only option enhancers such devices with modern acoustics - dual channel configuration, with the fader excluded from work.
In this version, you can add a subwoofer to include it in a "mixed-mono". Since the relationship between the levels regulate front speaker and subwoofer impossible, depending on the sensitivity applied to select one of the heads of connectivity options.
Option A is used in the case where the sensitivity of the front speakers 3-5 dB higher than that of the subwoofer. In this embodiment, they are connected to the amplifiers are not bridged, and the usual way, and the power supplied to them is not more than 7 w / 4 ohms. To obtain sufficient volume of the front acoustic desirable to use high-sensitivity head about 91-93 dB. Pay attention to their phasing - one of the "poluusiliteley" inverting the second - non-inverting. HPF cut formed by the capacitors C1 and C2 can be chosen arbitrarily, but the presence of capacitors is crucial - they do not miss out on the dynamics of the DC component from the output amplifiers. Front head shown conventionally broadband, but they may be coaxial or component.
Option B is used in nearly all heads of sensitivity. The presence of capacitors C1, C2 for the normal functioning is not necessarily because it is used in a bridge connection. In the absence of capacitors in the passband head subwoofer filter work in parallel. This reduces the load impedance to 2 ohms, but the amplifier is designed. Subwoofer in both cases the second-order filter (C3L1R1).
Monday, September 15, 2014
2 X 50W ICs amplifier with STK4191
The above is a stereo amplifier circuit based on IC STK4191 with 2 X 50Watt output power 8 ohm impedance. And besides that you can use some of the IC can also be applied in this series include the STK4101, 4111, 4121, 5131, 4141, 4151, 5161, 4171, 4181, and 4191. Required supply voltage from 12 Volt to 35 Volt DC.
100W subwoofer amplifier
General Description:
This is the circuit diagram of a fully transistorized sub woofer amplifier that can produce an output of 100W.There are seven transistors including four in the output stage. The transistors Q1 and Q2 form the preamplifier stage. Transistors Q4 to Q7 form the output stage. Since no ICs are used the circuit is very robust and can be easily assembled on a general purpose PCB.
Circuits features:
- The circuit can be powered from a +35V/-35V, 5A dual power supply.
- Use a 100W, 12 inch sub woofer at the output.
- All electrolytic capacitors must be rated 100V.
- The transistor Q4 to Q7 must be fitted with heat sinks.
Circuit Diagram:
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| 100W subwoofer amplifier circuit |
Sunday, September 14, 2014
Electronic Subwoofer Amplifier Circuit from Aliexpress
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230 400 Watt Power Amplifier MOSFET
Amplifier circuit below is a series of amplifiers with the amplifier transistor and mosfet. This amplifier output power ranging from 230W up to 400W.
| 230 - 400 Watt Power Amplifier |
Saturday, September 13, 2014
15W Audio Amplifier with STK055
Here the schematic diagram of 15W audio amplifier, built based on single power chip STK055 from Sanyo.The STK055 is old power amplifier chip which still available on the market because of the ease of its usage and the performance is good. This chip requires heatsink to be mounted on its body.
Technical details:
- Maximum power supply: ± 28V
- Recommended supply voltage: ± 20V
- Power output: 15W
- RL: 8 Ohm
- TDH: 0.3%
- Rin: 52K
- Gain: 26.4 dB
- Noise: 0.3mV
Friday, September 12, 2014
25 25W STEREO AMPLIFIER WITH MUTE ST BY
Features
- WIDE SUPPLY VOLTAGE RANGE (UP TO 50V ABS MAX.)
- SPLIT SUPPLY
- HIGH OUTPUT POWER: 25 + 25W @ THD =10%, RL = 8Ω, VS = +20V
- NO POP AT TURN-ON/OFF
- MUTE (POP FREE)
- STAND-BY FEATURE (LOW IQ)
- FEW EXTERNAL COMPONENTS
- SHORT CIRCUIT PROTECTION
- THERMAL OVERLOAD PROTECTION
Circuit Diagram
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| 25 + 25W STEREO AMPLIFIER WITH MUTE/ST-BY |
Layout:
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| PCB layout |
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