Thursday, January 9, 2014
Audio Amplifier
This audio amplifier circuit delivers up to 200 W of top-class quality for loudspeaker from 4 to 16 ohm. Operating voltage is between 24 and 36 V, max 5 A. The frequency response is from 20 to 20000 Hz.
Please take special care that the transistors and the IC’s have been fixed firmly and solely one or two separated cooling elements with sufficient dimensions for this purpose (thermal resistance < 1K/W).
Please take special care that the transistors and the IC’s have been fixed firmly and solely one or two separated cooling elements with sufficient dimensions for this purpose (thermal resistance < 1K/W).
200W Power Amplifier circuit diagram

Doing so it is necessary to mount the transistors and the IC’s insulated (with mica washes and plastic nipple). Please make sure before first operation that the transistors and the IC’s really do not have any electrical connection towards the cooling plate! The transistors have to be placed plane and firmly onto the cooling element! It is of extraordinary importance with this high-power amplifier that there is a considerable heat dissipation. The already mounted cooling element should be situated in a well ventilated case.
The PSU should be sufficiently powerful, power consumption of the amplifier may increase up to 5A. In case of using an unstabilised power supply. It is advisable to place a transformer of max 28V.
The amplifier will the show approx. 120W at a 4-Ohm loudspeaker, for it no-load voltage of the power supply will not be to high. If it is desired to use complete power, it is necessary to place a stabilised power supply with approx. 36V 5A. No-load voltage should not pass over 44V!
The cables leading the current supply and to the loudspeakers should have at least a cross section of min. 1.5 mm^2. The connected loudspeaker have to be equiped according to the high output power and should not have a lower impedance as 4 Ohm! With lower connection impedance and short circuit within the loudspeaker wiring, the transistors will be destructed.
The amplifier has an input sensitivity of approx. 500 … 800 mV. Therefore, it is possibile to connect directly at the amplifier tape decks, tuners, etc. In case there are connected signal sources with lower output voltage, it is necessary to pre-connect a preamplifier. Then it will alse be posible to connect microphones, etc.
200W audio amplifier PCB


Audio power amplifier components
IC1, IC2 = 2 IC’s TDA2030T1, T3 = 2 transistors KT818 or BD708
T2, T4 = 2 transistors KT819 or BD705
C1, C2, C3, C4, C7 = 5 capacitors 150 nF
C5 = 1 elca 10uF 63V
C8 – 1 capacitor 1.8 nF
R1, R7, R9 = 3 resistances 100K
R2, R3, R10, R11 = 4 resistances 2.2 Ohm
R4, R5 = 2 res. 2K
R6, R8 = 2 res. 1 Ohm
R12, R13 = 2 res. 2 res. 3.3K
D1…D4 = 1N4001, 1N4002, 1N4003
1 PCB board approx 56×51 mm
Friday, December 27, 2013
Simple Voltage controlled current source with grounded source and load
This is a Simple Voltage controlled current source with grounded source and load. This is a simple, precise voltage-controlled current source. Bipolar supplies will permit bipolar output. Configurations featuring a grounded voltage- control source and a grounded load are usually more complex and depend upon several components for stability.Voltage-controlled-current-source-with-grounded-source-and-load. In this circuit, accuracy and stability almost entirely depend upon the 100-0 shunt.
Voltage controlled current source circuit diagram

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Thursday, December 26, 2013
The omnidirectional antenna of cell phone jammer is common in normal use
U-Max Dingweizhixing business based on the positioning of mobile terminals, combined with GIS map data, can provide users with a wealth of location information services.
Unicom currently charges for mobile data communication standard is 0.01 yuan / kB. We are here to tell us through an example of the use of GPS: enter the Dingweizhixing Kyocera KZ850 function, select the "Where am I," later KZ850 will appear on the screen with a satellite picture, after a few seconds to ten seconds query time, the screen will display a description of the current location of mobile phones, such as "Wanquanhe Road, Wan new home near the new" kind of statement, then the user can further query the current location of the map, go a transfer to bus route, 500 meters to 2000 meters of restaurants, entertainment venues and so on. If getting through a call in the non-shielding area and walking into the shielding area, normally the cell phone will be shielded by cell phone jammer completely after covering a certain distance in the shielding area.The omnidirectional antenna of cell phone jammer is common in normal use.
The cost of this program is the GPS of 1 / 3. But by the mobile base station network resource constraints, continuous positioning in the high cost. Business management of employees; to provide for the sale of the company with multiple divisions, the sales staff working hours to work management; for remote decoding, where the phone number or other fixed internal procedures, to bind his number, binding After you can not limit the distance of the monitor, intercept, locate function. Electronic Technology Co., Ltd. Zhejiang left China Telecom is the only mobile location partners, using the most advanced, most accurate positioning technology GPSONE patrol, inspection, logistics, field / sales personnel management to provide efficient solutions. The directional antenna information of cell phone jammer should be described in details.
GPS company has many years experience in R & D and services, to provide car GPS and mobile positioning services. Digital Star is to develop mobile phone or terminal location and mobile application software company, its products and support the positioning of mobile phones and mobile phone also supports positioned between the display [2]. Is also the location of the earliest to provide mobile phone services company, mainly friends of the communitys position. Coverage had reached up to eight provinces. Cooperation with Henan MCC, mainly for business users, mobile location services platform. Coverage of Henan Province. Established in 2001, the first main GIS and telecommunications value-added services. Location networks Web site to provide mobile location-based services for enterprise and individual users. Coverage of 32 provinces and cities across the country.
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Unicom currently charges for mobile data communication standard is 0.01 yuan / kB. We are here to tell us through an example of the use of GPS: enter the Dingweizhixing Kyocera KZ850 function, select the "Where am I," later KZ850 will appear on the screen with a satellite picture, after a few seconds to ten seconds query time, the screen will display a description of the current location of mobile phones, such as "Wanquanhe Road, Wan new home near the new" kind of statement, then the user can further query the current location of the map, go a transfer to bus route, 500 meters to 2000 meters of restaurants, entertainment venues and so on. If getting through a call in the non-shielding area and walking into the shielding area, normally the cell phone will be shielded by cell phone jammer completely after covering a certain distance in the shielding area.The omnidirectional antenna of cell phone jammer is common in normal use.
The cost of this program is the GPS of 1 / 3. But by the mobile base station network resource constraints, continuous positioning in the high cost. Business management of employees; to provide for the sale of the company with multiple divisions, the sales staff working hours to work management; for remote decoding, where the phone number or other fixed internal procedures, to bind his number, binding After you can not limit the distance of the monitor, intercept, locate function. Electronic Technology Co., Ltd. Zhejiang left China Telecom is the only mobile location partners, using the most advanced, most accurate positioning technology GPSONE patrol, inspection, logistics, field / sales personnel management to provide efficient solutions. The directional antenna information of cell phone jammer should be described in details.
GPS company has many years experience in R & D and services, to provide car GPS and mobile positioning services. Digital Star is to develop mobile phone or terminal location and mobile application software company, its products and support the positioning of mobile phones and mobile phone also supports positioned between the display [2]. Is also the location of the earliest to provide mobile phone services company, mainly friends of the communitys position. Coverage had reached up to eight provinces. Cooperation with Henan MCC, mainly for business users, mobile location services platform. Coverage of Henan Province. Established in 2001, the first main GIS and telecommunications value-added services. Location networks Web site to provide mobile location-based services for enterprise and individual users. Coverage of 32 provinces and cities across the country.
Wednesday, December 25, 2013
Variable 5 to 20V DC Supply Rise
This is a Variable 5 to 20V DC Supply Circuit Diagram. If you are looking for a low drop voltage regulator that can provide a power supply of 1A with an output voltage of between 5V and 20V DC, National Semiconductor LM2941 Low Dropout Adjustable Regulator is that you can pick to make use of. Its a typical dropout voltage of 0.5V which means that the input supply need only must be 0.5V DC over the desired output voltage.
Variable 5 to 20V DC Supply Circuit Diagram

Its other features include internal short circuit current limit and reverse battery protection. As shown in the schematic below, the regulator has five pins which consists of the ON/OFF control, Input Voltage, Output Voltage, Ground & Adjustable pins. ON/OFF is used for the purpose of switching on & off of the regulator. The capacitors C1 & E1 are to be placed as close as feasible to the regulator.
The output of the circuit can be varied by varying the worth of potentiometer VR1 from 5V DC to 20V DC. The input voltage is limited from five.5V DC to 30V DC. Resistor R1 must be greater than 1K. The worth of the VR1 that needs to be set is calculated from the formula given below:
VR1 = R1[(Vout/1.275) - 1] ohm
If R1=1K, Vout = 5V, VR1 should be set to 2.9K ohm.
If R1=1K, Vout = 20V, VR1 should be set to 14.7K ohm

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