Search results for amplifier
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Mini-box 2W Amplifier Designed for self-powered 8, 4 & 2 Ohm loudspeakers. Contains Bass-boost switch.... [read]
A 15 watt amplifier made using discrete components. Interesting and not so difficult do build.... [read]
A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components... [read]
An amplifier to drive low to medium impedance headphones built using discrete components... [read]
A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker... [read]
This circuit is designed to work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals.... [read]
This circuit is basically an audio amplifier, but it is placed in this category because it may be used as signal tracer. It is built around simple National... [read]
This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels... [read]
This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device.... [read]
The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. ... [read]
10W Mini Audio Amplifier with very small count of electronic components based around TDA2003 circuit. You can use this powerful amplifier in any small audio... [read]
Can be directly connected to CD players, tuners and tape recorders.... [read]
In recent years, following CD's introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old... [read]
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input.... [read]
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a gain of 4, in order to drive less sensitive power amplifiers.... [read]
The aim of this design is to reproduce a Combo amplifier of the type very common in the sixties and the seventies of the past century.... [read]
Bass, Treble, Harmonic modifier and Brightness controls. Output power: 40W on 8 Ohm and 60W on 4 Ohm loads... [read]
The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer.... [read]
Tendency of catering: 15V Force of expense: 4,2Wrms in the 4W Minimal signal of entry: 94mVp-p with preamplifier, 0,65Vp-p without the preamplifier.... [read]
This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like it is shown in the table (from 20 W to 80 W RMS)... [read]
Stereo tape head preamplifier using LA3161 circuit diagram... [read]
20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc.... [read]
Infrared cordless Headphone Amplifier circuit diagram.... [read]
It is designed for portable cassette players and radios. You can also use it as your PC Audio Amplifier. A few external components required to build this circuit.... [read]
The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.... [read]
While talking to a distant subscriber on telephone, quite often we feel frustrated when the voice of the distant subscriber is so faint that it is barely intelligible.... [read]
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least.... [read]
The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and... [read]
Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and headphones. In place... [read]
This circuit warns the user against fire accidents. It relies on the smoke that is produced in the event of a fire. When this smoke passes between a bulb and... [read]
A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured... [read]
Here is the schematic for an 8 watt audio amp. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp.... [read]
This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set... [read]
Audio light modulations add to the enjoyment of music during functions organised at home or outdoors.... [read]
This project allows you to control the speed, direc-tion, and step size of a unipolar four-phase step-per motor. The controller is capable of handling motor... [read]
It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz - 5000KHz... [read]
Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed... [read]
Described here is a very inexpensive solution to many phono-controlled applications like remote switching on, for instance, or activating a camera, tape recorder,... [read]
A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance... [read]
An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout. ... [read]
Imagine that is morning , you barely anticipate the bus for work and you can't find your keys. If you suffer from this situation frequently, this circuit is... [read]
The ATL-3 Loop Antenna. The Medium Wave Circle can be found on http://www.mwc.org... [read]
The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance.... [read]
This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive... [read]
The controls may also be adjusted for use as a band stop (notch) filter or band pass filter.... [read]
This oscillator produces sinusoidal wave. It's made around LF351 or TL071CN or TL081CN. A classic Wien Bridge oscillator... [read]
Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently... [read]
This SMD FM transmitter has an operating frequency of about 80 to 115MHz. Under reasonable circumstances you will be able to receive its signal at a distance... [read]
The circuit is a MOSFET based linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere. Drop of a fewer millivolts is possible with better... [read]
A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts. The mic inputs are amplified about 100 times or by 40dB, the total gain... [read]
This circuit is adapter for PC which enables you to use electret microphones. It's an audio amplifier made of two BC547C.... [read]
Circuit of a new type of remote control switch is described here. This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz... [read]
Used to detect sound in some area. This circuit has only two transistors and several passive components... [read]
This lovely circuit is a real gem! Easy to assemble and more sensitive than many commercial devices available.... [read]
A very high quality intercom, which may also be used for room monitoring... [read]
Most of the CDROMS available have an Audio-Out Output to either plug in the headphones or connect it to an amplifier.... [read]
This circuit has minimal number of components and it's easy to build. It measures peak level of a sound signal. It uses ... [read]
Here is a little audio amplifier similar to what you might find in a small transistor radio. The input stage is biased so that the supply voltage is divided... [read]
This circuit could be used for replacing your manual volume control in a stereo amplifier.... [read]
This complete high quality, low noise 5-BAND GRAPHIC EQUALIZER circuit is based around Monolithic Linear integrated circuit LA3600 manufactured by SANYO. This... [read]
This circuit provides an FM modulated signal with an output power of around 500mW... [read]
This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter... [read]
This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio... [read]
This is a very straightforward circuit. The first stage acts as a crystal receiver.... [read]
Audio preamplifier designed for dynamic or electret microphones. Uses several components which are easy to find. It has a 23.5k ohm input impedance. It can... [read]
This circuit is designed to amplify the input from a telescopic whip antenna... [read]
A circuit to extract and measure the modulated carrier of an Infra Red remote control... [read]
It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can�t hear these high-frequency... [read]
Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier.... [read]
An infra-red or wireless remote control has the disadvantage that the small, handy, remote transmitter is often misplaced. The sound operated switch has the... [read]
Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic components.... [read]
This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn't so bad, a PLL... [read]
high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors... [read]
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the... [read]
This circuit, connected with 32 Ohms impedance mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture goers: every word will... [read]
In order to obtain a good audio reproduction at different listening levels, a different tone-controls setting should be necessary to suit the well known behaviour... [read]
Here is a VLF receiver tuned to 300 kHz designed to detect the crackle of approaching lightning. A bright lamp flashes in sychrony with the lightning bolts... [read]
This circuit was designed to detect the approximate percentage of salt contained in a liquid. After careful setting it can be useful to persons needing a quick,... [read]
H ere is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. The circuit is so simple that... [read]
This circuit was designed on request, to remotely monitor when a couple of electric heaters have been left on.... [read]
This circuit has been designed to alert the vehicle driver that he has reached the maximum fixed speed limit (i.e. in a motorway). It eliminates the necessity... [read]
The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances... [read]
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