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Here is a phase-shift audio oscillator with excellent distortion characteristics thanks to “softened” diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor. For minimum distortion, increase the 68 ohm resistor to a point just below where oscillation stops. A simple buffer may be added for driving lower impedance loads. The output amplitude will be about 5 volts p-p but one of the 1N914 ’s 10k divider resistors may be changed for a different output amplitude. The circuit will work well with a power supply voltage other than 9 volts but the 68 ohm resistor may need adjustment

Telephone line Based Audio Muting and Light-On Circuit . Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone call. To overcome this situation, the circuit presented here can be used. The circuit would automatically light a bulb on arrival of a telephone ring and simultaneously mute the music system/TV audio for the duration the telephone handset is off-hook. Lighting of the bulb would not only indicate an incoming call but also help in locating the telephone during darkness. . Telephone line Based Audio Muting and Light-On Circuit diagram :   Telephone line Based Audio Muting and Light-On Circuit Diagram  . On arrival of a ring, or when the handset is off-hook, the inbuilt transistor of IC1 (opto-coupler) conducts and capacitor C1 gets charged and, in turn, transistor T1 gets forward biased. As a result, transistor T1 conducts, causing energisation of relays RL1, RL2, and RL3...

1000Watt Audio Power Amplifier Blazer Circuit This is a audio power amplifier Blazer circuit provides up to 1000Watt . This fascinating routes several sensible bass and treble alive. Importantly ought to opt for Power offer supply, that has been fairly high voltage category 70Vdc GND -70V 10A is that the current low level. The transistors are 2SC3858 (NPN) and 2SA1494 (PNP), and have high bandwidth, wonderful safe operating space, high linearity and high gain. Driver transistors are 2SC5200 (NPN) and 2SA1943 (PNP). All devices are rated at 230V, with the facility transistors having a 150W dissipation and also the drivers are 50W. This circuit describes an amplifier, power offer and tests procedures that are all inherently dangerous. Nothing described during this article ought to even be thought-about unless you're totally experienced, grasp specifically what you're doing, and are willing to require full 100% responsibility for what you are doing. There are aspects of the lo...

This is the best IC LA 4440 Laptop Audio Amplifier circuit diagram, the audio output from the laptop’s built-in loudspeakers is low. A energy amplifier is needed to obtain a high volume. This is a simple circuit to amplify the laptop’s audio output. The circuit is made around energy amplifier IC LA 4440 (IC1) along with a couple of other components. LA4440 is really a dual funnel audio energy amplifier. Circuit diagram : Laptop Audio Amplifier Circuit Diagram It’s low distortion over an array of low to high wavelengths with good funnel separation. Built-in dual channels enable it for stereo system and bridge amplifier programs. In dual mode LA4440 gives 6 w per funnel as well as in bridge mode 19- watt output. It’s ripple rejection of 46 dB. The audio result can be recognized by utilizing two 6-watt loudspeakers. Connect hooks 2, 6 and ground of IC1 towards the stereo system jack which is combined with laptops. Assemble the circuit on the general-purpose PCB and enclose inside a...

We have seen here on the blog a very interesting audio compressor circuit, the audio compression is the process that adjusts the level of an audio signal, reducing the volume of loud sounds or amplifying low sounds by narrowing or dynamic range compression an audio signal. The audio compression is used for sound recording, playback, radio and amplifiers for musical instruments, among other utilities. This circuit presented here is a single audio compressor that uses only passive components, or any semiconductor such as transistor, diode or integrated circuit. Audio Compressor circuit This compressor dynamic audio with passive components reduces the high signal to a lower signal, but more constant. If you look at this circuit will realize that has no power supply because it only reduces the input signal. The basic operation is simple in its exit from the compressor will have a constant audio signal of approximately 70mV, so when the input voltage is between 100mV and 10Volts. The reduct...

This Circuit Audio Amplifer with IC TBA 611 require voltage  4,5 to 15 Volt. I recomended to this circuit supply with 12 volt . Output audio is mono with power 1 Watt. See this circuit and datasheet IC TBA611 below: Datasheet IC TBA 611 Vcc                = 4,5-15 V Pout               = 1 W RL                 = 8 Ohm Ft                   = 50-15 Khz Icco               = 10 mA Package         = TABS4-14 Manufactered = RFT

You can use this powerfull amplifier in any small audio project. It is very small (6.5 x 4.5 cm).It outputs 10W and uses a 9V battery. Component   PCB Componets List R1 : 6 Ohm R2 : 220 Ohm R3 : nothing R4 : 10 KOhm pontesiometer C1 : 2200 uF / 25V C2 : 470 uF / 16V C3 : 470 nF / 63V C4 : 100 nF C5 : nothing C6 : nothing IC1 : TDA 2003

This circuit was originally designed for use in detecting discharges from individual neurons, where the infrequent discharges are difficult to separate from dominant background noise. It may also prove useful in other applications that need to detect infrequent low-level audio signals against a noisy background. The audio input signal is buffered by op amp IC1 before being applied to the opposing inputs of comparators IC4 & IC5. Positive and negative offset voltages are generated by VR1 and IC2 and fed to the other two inputs of the comparators. Essentially, the comparators act to produce a negative voltage at their commoned outputs (C) whenever the audio signal exceeds either the positive or negative offset voltage. Circuit diagram: Audio Level Threshold Control Circuit Diagram The signal at "C" is inverted by transistor Q1 to produce "D". These two signals are used to control a pair of CMOS switches (S1 & S2), which either pass the audio signal to the ...

Quality Stereo Wireless Microphone or Audio . This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It’s certainly not the first wireless microphone we’ve ever published but this one is a little different. It’s stereo, providing surprisingly good quality sound. Second, it has a really good range. We tested it at well over 50m and it was still performing very well – noise-free, in fact – but at the time we couldn’t get our receiver any further away. So it’s likely to have even better range than that. Complete Project: It's easy to build, requires very little setup... and it's cheap! In fact, the low price might turn some people off, thinking it's low quality. Try it - and be pleasantly surprised! Third, it really is simple to build – the hard work (the transmitter module) is already done for you. It’s just a matter of assembling the microphone module, which contains the electret mics themselves, ...

General Description: The TA8211AH is dual audio power amplifier for consumer  applications.   This IC provides an output power of 6 watts per channel   (at VCC = 20 V, f = 1 kHz, THD = 10%, RL = 8 Ω).  It is suitable for power amplifier of TV and home stereo.  Features: High output power: Pout = 6 W/channel (Typ.)   (VCC = 20 V, RL = 8 Ω, f = 1 kHz, THD = 10%)  Low noise: Vno = 0.14 mVrms (Typ.)   (VCC = 28 V, RL = 8 Ω, GV = 34dB, Rg = 10 kΩ,   BW = 20 Hz~20 kHz)  Very few external parts  Built in thermal shut down protector circuit  Operating supply voltage range: VCC (opr) = 10~30 V (Ta = 25°C)  Circuit Diagram: Circuit diagram for Dual Audio Power Amplifier 

This is the Simple Audio Pre-Amplifier Circuit Diagram 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 Audio Pre-Amplifier Circuit Diagram

General Description: Above schematic is for a three channel audio mixer. That will provide an overall gain of one between the output and each input channel. Each input channel includes a single 0.1uf capacitor and 100-Kilohms resistor to provide an output impedance of 100K. The number of input channels to this audio mixer can be increased by adding more capacitors and resistors with same value as capacitor(0.1uf) and resistor(100K). The mixer should be located between the output of tone control circuitry and the input to the power amplifier. One input should be taken from the output of the tone control circuit, and the other inputs should either be grounded or taken from desired source. Circuit diagram: Three Channel Audio Mixer circuit diagram

Here the 50W audio amplifier circuit diagram. The amplifier is based ICL8063. This a good amplifier circuit which is easy enough to built.. This circuit can be connected by radio, TV, stereo or other devices. The circuit is also featured with inputs for the record player, guitar, microphone, and others. If you add low pass filter at the input, it will work like a mini-subwoofer. Circuit scheme presented will guide you in 50W amplifier construction, good luck. The power supply is splitted type, already added on above circuit diagram. Components List: R1 = 200R 1/4W R2 =200K 1/4W R3 = 30K 1/4W R4 = 1K 1/4W R5 = 5K 1/4W R6, R9 = 1M 5% 1/2W R7, R8 = 0,4 ohm 5W R10 = 10K Pot R11, R12 = 51K 1/4W R13 = 47K 1/4W C4, C6, C5, C7, C8 = 1nF C9 = 50pF C10 = 0,3uF C11, C12 = 10000uF/50V U1, U2 = IC 741 Op Amp U3 = ICL8063 Q1 = 2N3055 NPN Power Transistor Q2 = 2N3791 PNP Power Transistor D = 250V 6A Bridge Rectifier T = 50V Center Tapped 5A Tranformer C1 = 100uF/35V F1 = 2A Fuse C2 = 11nF SPEAKER = 8...

This is a simple project of USB Powered Audio Power Amplifier Circuit Diagram. This USB Powered Audio Power Amplifier Circuit Diagram of multimedia speakers for PCs has single-chip-based design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance. At the heart of the circuit is IC TDA2822M. This IC is, in fact, mono-lithic type in 8-lead mini DIP package. It is intended for use as a dual audio power amplifier in battery-powered sound players. Specifications of TDA2822M are low quiescent current, low crossover distortion, supply voltage down to 1.8 volts and minimum output power of around 450 mW/channel with 4-ohm loudspeaker at 5V DC supply input.  An ideal power amplifier can be simply defined as a circuit that can deliver audio power into external loads without generating significant signal distortion and without consuming excessive quiescent current. This circuit is powered by 5V DC supply available...

This is a simple 56W High Audio Amplifier Use LM3875 Circuit Diagram. The LM3875 is an audio amplifier for high power output capable of delivering 56W of continuous average power to a load 8. The performance of the LM3875, utilizing its maximum instantaneous auto temperature (° Ke) (Spike ™) protection circuitry, places it in a class above discrete and hybrid amplifiers by providing a yes, dynamically protected area of safe operation (SOA). SPIKE protection means that these parts are fully protected against output overvoltage, voltage surges caused by shorts to the supplies, the peak temperature thermal runaway, and instantaneous. 56W High Audio Amplifier Use LM3875 Circuit Diagram     This amplifier circuit is based on the non-inverted GainClone standard configuration. I did some calucaltions the feedback resistor and other components in order to check the gain, etc. For more background on the calculations relevant to GainClones in the background section. Parameters IC LM3875...

Features 1 watt per channel with 8-ohm load Max. efficiency » 80% with 8-ohm load at 5 volts Filterless Digital gain control Build-in depop circuitry Error protection for short circuit and over-temperature Mute (shutdown) current < 1µA typical Low operating current (4mA at 5 volts without load) TSSOP 24L package available  General Description The AP130 is an oversampling class-D power amplifier for  stereo audio applications. It provides high power-efficiency for filterless 8-ohm load. Build-in depop, mute and gain control features simplify the applications. BTL (Bridge-Tied-Load) configuration delivers up to 1 watt into 8-ohm load per channel at 5-V supply voltage. It allows direct coupling of the power signal. Reliability is improved through over-temperature and short circuit protections. The class-D power amplifier enables high efficiency applications for portable devices. Circuit Diagram 1W Per Channel Stereo Class-D Audio Power Amplifier

Circuit diagram: Low Voltage Audio Power Amplifier LM386 Datasheet for LM386: Download

Audio Controlled Mains Switch Circuit Diagram. It is often useful for audio or video equipment to be switched off automatically after there has been no input signal for a while. The function of the on-off switch in such equipment is then taken over by switch S2 in the accompanying diagram. It remains, however, possible to  switch off manually by means of Si. Automatic  switch-off occurs after there has been no input  signal for about 2 minutes: this delay makes it possible for a new record or cassette to be placed in the  relevant machine.   The audio input to the proposed circuit may be  taken from the output of the relevant TV set, amplifier, or whatever. The input earth is held at + 6 V  with respect to the circuit earth by potential divider  Ri-R2-R3-R4. The two 741s function as comparators: the output of ICi goes high when the in- put signal is greater than + 50 mV, whereas the out- put of IC2 goes high when the input signal  becomes mor...