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Index 267

200mW Amplifier

Published:2012/11/21 1:44:00 Author:muriel | Keyword: 200mW , Amplifier

200mW Amplifier
A small battery driven amplifier with 200mW output. This is a suitable amplifier for portable radios and other battery powered equipment. (View)

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32 Watt Amplifier

Published:2012/11/21 1:43:00 Author:muriel | Keyword: 32 Watt, Amplifier

32 Watt Amplifier
A 32 Watt per channel stereo power amplifier made using the TDA2050V monolithic integrated circuit. (View)

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24 Watt Class A Amplifier

Published:2012/11/21 1:42:00 Author:muriel | Keyword: 24 Watt , Class A , Amplifier

A 24 Watt Class A Amplifier made from discrete semiconductors, built and tested by Marc Klynhans from South Africa. (View)

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Three Band Active Tone Control

Published:2012/11/21 1:41:00 Author:muriel | Keyword: Three Band, Active Tone, Control

Three Band Active Tone Control
Here, it is a diagramm of an active loudspeaker. The LF353 of, National Semiconductor, is going to split audio signal into three bands. SANYO'S LA47536 is going to amplify these signals. In stereo mode, we shall have the action of eight high speakers who are going to create a very important sound pressure. (View)

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The GEM: Class-A//AB Amplifier

Published:2012/11/21 1:40:00 Author:muriel | Keyword: Class-A//AB, Amplifier

The GEM: Class-A//AB Amplifier
The GEM is an audio power amplifier embodying simultaneously active Class A and Class AB output stages for 100+ Watts into a 4 ohm loudspeaker. The front end pcb will drive up to 100+W variants, or the 200+ Watts version into a 4 ohm loudspeaker load. (View)

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Buffer Amplifier

Published:2012/11/21 1:39:00 Author:muriel | Keyword: Buffer Amplifier

Buffer Amplifier
A hifi preamplifier designed to convert high output impedance amplifiers to 600 ohm outputs. (View)

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Resistor detected motor reversing control circuit

Published:2012/11/20 21:10:00 Author:Ecco | Keyword: Resistor detected motor , reversing control

Resistor detected motor reversing control circuit

Motor reversing control circuit has more joints, so it is easy to make mistakes in the newly installed or renovated cases. Resistor method for detection can avoid accidents, and the circuit is shown in the figure. The multimeter dial in R × 100Ω stopper, under normal circumstances, the values between the various points of the circuit are shown in the following table. (View)

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Eight-way remote control transmitter CS901

Published:2012/11/20 21:07:00 Author:Ecco | Keyword: Eight-way , remote control, transmitter

Eight-way remote control transmitter CS901
The keys SA1 ~ SA8 and diodes VD1 ~ VD13 form Octal matrix input circuit for the eight encoded input circuit of remote control transmitter circuit. Because the SM5262's pin 7 to 13 are used for the address / data common terminals, if ther are used as the data input terminals, the circuit has a total of six data input terminals, when all of them are used for data input, they can form a total of 26 = 64, i.e. 64-channel remote control transmitter. (View)

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The Anti Shake circuit with NAND gate

Published:2012/11/20 21:04:00 Author:Ecco | Keyword: Anti Shake, NAND gate

The Anti Shake circuit with NAND gate
Dither signal may occur in the conversion of digital electronic signal from chain mechanical switch, and it may cause misoperation, so the illustrated circuit may be used for this. (View)

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Pressure gauge circuit with magnetic components

Published:2012/11/20 20:30:00 Author:Ecco | Keyword: Pressure gauge, magnetic components

Pressure gauge circuit with magnetic components
The circuit uses magnetic components FP210P250, and they form a bridge circuit with two 1kΩ resistors and connected to the input terminal of the operational amplifier. Bridge voltage is stablized by regulator in order to make it independent from supply voltage fluctuations. It uses the distance between feedback resistors R1 and small iron piece magnetic components to realize stroke control the size of the output current. (View)

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Great Wall programmed box fan circuit

Published:2012/11/20 20:34:00 Author:Ecco | Keyword: Great Wall , programmed box fan

Great Wall programmed box fan circuit
Great Wall FS36-40 fan uses programmable technology, and it has three wind species, three wind speeds and four-time segment timing shutdown function. It also has 10W lights at night, and the circuit is shown as the figure. The circuit uses IC chip RTS-1A with fewer external components and manual operation and automatic operation. H1 ~ H10 are light emitting diodes. (View)

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Automatically series reactance start three-phase motor circuit 2

Published:2012/11/20 0:39:00 Author:Ecco | Keyword: Automatically, series reactance, start, three-phase motor

Automatically series reactance start three-phase motor circuit 2
As shown in figure, pressing the start button ST, then the KM1 coil will pull in, and the main contacts are connected to reactors group L, the motor M gets to the buck start state. At the same time, due to the closure of the the KM1 auxiliary contacts, time relay KT gets electric timing. When the delay time reaches KT's tuning time, KT contacts are closed, KM2 coil gets electric, the normally closed contact cuts KM1 coil loop, then the KT coils have also de-energized, KM2 normally open contact action to protect themselves. (View)

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Homemade fast hand dryer circuit

Published:2012/11/20 1:27:00 Author:Ecco | Keyword: Homemade, fast hand dryer

Homemade fast hand dryer circuit

When it is illuminated, the IC's pin 1 is in high potential, TWH8751 is cutoff, J loses power, J1-1 disconnects. When the hand gets into and blocks the light, D2 shows a large resistance, pin 2 of the IC is in a low potential, the IC output end gets conduction, J1-1 is turned on, the electric wire and the motor are energized. (View)

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Three-phase motor speed measured with a multimeter

Published:2012/11/20 1:58:00 Author:Ecco | Keyword: Three-phase , motor speed , multimeter

Three-phase motor speed measured with a multimeter
In the Figure, μA uses the multimeter 50μA block ( it is also available to use 1mA block ). It is connected with any winding of three-phase stator windings, then slowly turning the motor rotor can make rotor run in the uniform speed. There is always a certain amount of remanent magnetization of the used motor, when the rotor is rotated, the magnetic force will cut lines, then the electromotive force is induced in the stator windings, there is current flowing through the ammeter swing. (View)

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Single phase shaded pole motor commutation circuit

Published:2012/11/20 2:17:00 Author:Ecco | Keyword: Single phase , shaded pole, motor commutation

Single phase shaded pole motor commutation circuit
Due to the stator structure and particularity of working principle, shaded pole motor can not use interchangeable winding terminals to change direction like the split-phase capacitor motor. The shaded pole motor's shaded pole split-phase effect can make the original magnetic field without rotating nature change into an approximation rotating magnetic field. (View)

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Water tower automatic water supply protection circuit

Published:2012/11/20 2:21:00 Author:Ecco | Keyword: Water tower , automatic water supply rotection

Water tower automatic water supply protection circuit
VT1, VT2, VT3, J1 are the main components of the pumping circuit, the working principle is not difficult to make a self- analysis for reader. Water protection circuit is mainly composed of the probe D and VT4, if the pumping time interval is too long, the tube memory water leakage is below D, and the water circuits A , D are open, VT4 gets saturated conduction, so that VT1 base pole clamp is at low potential. When the towers level falls to the lower limit B or less, due to the extremely low level of VT1 base, it can not be turned and therefore can not pumping. (View)

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Op-Amp Mic Preamp

Published:2012/11/19 23:47:00 Author:muriel | Keyword: Op-Amp, Mic, Preamp

Op-Amp Mic Preamp
A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The op-amp used can be any low noise, high performance type, e.g. NE5534,TL071, OPA 371 etc (View)