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Audio Amplifier Circuits
Audio Amplifier Circuits
This circuit is for low voltage applications requiring high power outputs. Output power levels of LO W into 4 ohm from 6 V and 3 V into 8 ohm from 12 V are typical. Coupling capacitors are not necessary since the output dc levels will-be within a few tenths of a volt of each other
Novel loudspeaker coupling circuit
The ground side of the speaker is connected to the junction of two equal high value capacitors (1000 Âµf is typical) across the supply. The amplifier output voltage will be Vs/2, and so will the voltage across CI (if CI and C2 are equal); so as the supply voltage builds up, the dc voltage across the speaker will remain zero, eliminating the...
Ultra-high gain audio amplifier
Sometimes called the JFET Âµ-amp, this circuit provides a very low power, high gain amplifying function. Since Âµ of a JFET increases as drain current decreases, the lower drain current is, the more gain you get
Instrumentation amplifiers (differential amplifiers) are specifically designed to extract and amplify small differential signals from much larger common mode voltages. To serve as building blocks in instrumentation amplifiers, op amps must have very low offset voltage drift, high gain and wide bandwidth. The HA-4620/5604 is suited for this...
Three-amplifier circuit consumes only 135 /tW of power from a Â±1 V power supply. With a gain of 101, the instrumentation amplifier is ideal in sensor interface and biomedical preamplifier applications
This circuit shows a method which increases the power capability of a drive system for audio speakers. Two HA-2542s are used to operate on half cycles only, which greatly increases their power handling capability. Bridging the speaker, as shown, makes 200 mA of output current available to drive the load.
The amplifier"s gain is nominally 20 dB. Its frequency response is determined primarily by the value of just a few components-primarily C1 and Rl. The values in the schematic diagram provide a response of Â±3.0 dB from about 120 to over 20,000 Hz. Actually, the frequency response is flat from about 170 to well over 20,000 Hz. it"s the low...
Sound detected by electret microphone MIC1 is fed to IC1"s input through resistor R2, and capacitors Cl and C2. Resistors R2 and R5 determine the overall stage gain, while C2 partially determines the amplifier"s frequency response. To ensure proper operation, use a single-ended power supply. R3 and R4 simulate a null condition equalto half...
The LM383 is an audio-power amplifier that is capable of producing up to 8 W of audio output. R1 is essentially a load resistor for the hand-held transceiver"s audio output. R2 can be composed of two fixed resistors in a 10:1 divider arrangement, but using a potentiometer makes it easy to set the amplifier"s maximum gain. When powered from a...
Electronic scales have come into wide use and the HA-510X, as a very low noise device, can improve such designs. This circuit uses a staingauge sensing element as part of a resistive Wienbridge. An auto-zero circuit is also incorporated into this design by including a sample-and-hold network. The bridge signal drives the inverting input of a...
The circuit can use any general-purpose, low-offset, low-drift op amp, such as the OP-07. The differential signal from the bridge feeds an amplifier that drives an ordinary, rugged Â±50-p.A meter. Near the null point, however, the drastically reduced signal level from the bridge requires very high gain to achieve a high null resolution. To...
This circuit shows amplifier Al as a sensor amplifier in a bridge configuration. Amplifiers A2 and A3 are configured as a voltage to frequency converter and A4 is used as the transmitter. This entire sensor/ transmitter can be powered directly from a 4 to 20 mA current loop. The bridge configuration produces a linear output with respect to...
In applications involving strain gauges, accelerometers, and thermal sensors, a bridge transducer is often used. Frequently, the sensor elements are high resistance units requiring equally high bridge resistance for good sensitivity. This type of circuit then demands an amplifier with high input impedance, low bias current and low drift.
The LT1007 is capable of providing excitation current directly to bias the 350-0 bridge at 5 V. With only 5 V across the bridge, as opposed to the usuallO V, total power dissipation and bridge warm-up drift is reduced.
This audio amplifier design approach employs TMOS Power FETs operating in a complementary common- source configuration. They are biased to cutoff, then turn on very quickly when a signal is applied. The advantage of this approach is that the output stage is very stable from a thermal point of view. U1 is a high slew-rate amp that drives Q3,...
Ul, an FET op amp needs a bipolar voltage atpins 4 and 7 with a common ground for optimum gain. You can calculate the gain by dividing R2 by Rl. Zero-set balance can be had through pins i and 5 through R3. Put a voltmeter between pin 6 and ground and adjust R3 for zero voltage. Once you"ve established that, you can measure the ohmic...
In this circuit, a 2-MHz clock is divided by eight in Ul, providing a stable 250-kHz carrier. Ql and Q2 buffer the clock and provide a low-impedance drive for op amp U4, which is a high-gain amplifier and integrator. U4 accepts audio inputs and converts the 250-kHz square wave into a triangular wave. The summed audio and triangular-wave signal...
The single speaker amplifier circuit uses current feedback, rather than the more popular voltage feedback. The feedback loop is from the junction of the speaker terminal and a 0.5-0 resistor, to the inverting input of the NE5534. When the input to the amplifier is positive, the power supply supplies current through the TIP32 and the load...
The input is ac coupled to the amplifier through C2, which blocks de signals that might also be present at the input. The Rl/Cl combination forms a low-pass filter, which eliminates unwanted high-frequency signals by bypassing them to ground when they appear at the circuit input, which has an impedance of about 52 0. The gain of the amplifier...
This amplifier delivers 20 W into an 8-D load using a single IRF520 driving a transformer coupled output stage. This circuit is similar to the audio output stage used in many inexpensive radios and phonographs.
The CA3080 can be used as a gain controlling device. The input signal is attenuated by R1/R2 so that a 20-mVpp
Designers can build a 15-dB compressor with a miniature lamp and a current-feedback amplifier. The circ
Receiver Audio Circuit
This simple receiver AF amplifier can supply several hundred milliwatts to an 8- speaker. The gain is about 200X. If
Electric Guitar Matching Amplifier
An electric guitar often has to be connected to a mixing panel, a tape deck or a portable studio. As far
Universal Audio Line Amplifier
A line amplifier is always a useful unit to have around, whether it is for matching a line signal or raising
When an inverter is biased with one resistor from its input to output in the range of 100 KOhmhm to 10 and is capacitor c
Op Amp Power Driver
Frequently, the output current of an operational amplifier is inadequate for the application as, for instance, when a s
Low-Drift/Low-Noise Dc Amplifier
Figure 39-2"s circuit combines a low-noise op amp, IC1, with a chopper-based carrier-modulation scheme to
20W Stereo Amplifier Circuit
The 20-W + 20-W stereo amp consists of two complete, separate 20-W RMS bridge-type amplifiers. The input signal source is brought into the amplifier through the voltage divider network, which is made up of Rl, R2, and PI. Resistor Rl provides a load impedance between the signal source and ground. Resistor R2 couples that signal to potentiometer...
Subwoofer Amplifier Circuit
Designed to feed a low-frequency subwoofer speaker system, the amplifier is capable of up to 100 W into an 8- load. The OPA541BM op amp requires heatsinking and is manufactured by Burr-Brown Corporation.
Audio Power Amplifier Circuit
The circuit, built around an LM741 op amp configured as an inverting amplifier, is used to drive complementary transistors (Ql and Q2). The op amp`s feedback loop includes the base-emitter junctions of both transistorsan arrangement that helps to reduce crossover distortion that would normally occur as-a result of the emitter-to-base junction...
Fast High-Voltage Linear Power Amp Circuit
An Apex PB50 Booster Amplifier, plus an IC op amp, can be used in a high-voltage op amp that converts a small analog signal to a 180-V p-p signal.Apex Microtechnology manufactures a number of power op amps.
Audio Filters Circuits
Audio Oscillator Circuits
Audio Mixer Circuits
Audio Equalizer Circuits
Audio Tone Balance Circuits
Beeper Buzzer Circuits
Vacuum-Tube Valves Circuits
Musical & Effects Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
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