Sunday, October 26, 2014
Type of USB connectors
USB connector there are only 2 kinds, namely the connector type A and type B connector, as shown below. Type A connector used to connect the USB cable into the USB terminal on the back of the computer the last few years of production. Type B connector used to connect the USB cable into the USB terminal on the equipment, for a simple USB devices, such as mouse, usually do not use the connector B, to save cost in the cable directly connected to the inside of the mouse.
Specified in the standard reference pesyaratan very strict to USB cable, not just the cable can be used, all the more for USB full-speed transfer of data to 1.2 Mega bps. So that the USB cable always sold as a ready-made, one end attached to the connector type A and the other end attached to the connector type B, no one sells it off the USB connector.
On the computer, usually there are two terminals for connector type A, so it can easily be paired with 2 pieces of USB devices. Manufacturing company that makes the mother board there is an additional USB terminal, you can buy if you want to add more than 2 USB devices. USB terminal on the computer named as Root Hub Another way is to use a USB hub as shown in the figure, in this way can one USB terminal on the broken into four.
Each of these fractions can also be connected to another USB Hub, as well as onward connection to connect to as many as 7 levels, which could eventually connect to 128 pieces of USB devices!
uA741 Low pass filter circuit 10KHz
This be the circuit filters 10KHz low size frequencies s use IC op-amp the highly popular number uA741. By this circuit convenients for to apply to input and output of the circuit changes analog signal be digital or the circuit changes digital signal be digital. In sound system of digital for synthetic the voice or music give for make wave form output the smooth. And press the noise that happen at output. When small-sized signal was managed with decrypt linear the size is 8 bit.
Saturday, October 25, 2014
Preamplifier Circuit Diagram DCF77
DCF77 Preamplifier Circuit Diagram A popular project among microcontroller aficionados is to build a radio-controlled clock. Tiny receiver boards are available, with a pre-adjusted ferrite antenna, that receive and demodulate the DCF77 time signal broadcast from Mainf lingen in Germany.
DCF77 has a range of about 1,000 miles. All the microcontroller need do is decode the signal and output the results on a display. The reception quality achieved by these ready-made boards tends to be proportional to their price. In areas of marginal reception a higher quality receiver is needed, and a small selective preamplifier stage will usually improve the situation further.
The original ferrite antenna is desoldered from the receiver module and connected to the input of the preamplifier. This input consists of a source follower (T1) which has very little damping effect on the resonant circuit. A bipolar transistor (T2) provides a gain of around 5 dB. The output signal is coupled to the antenna input of the DCF77 module via a transformer.
Circuit diagram:
| DCF77 Preamplifier Circuit Diagram |
DCF77 Preamplifier Circuit Diagram The secondary of the transformer, in conjunction with capacitors C4 and C5, forms a resonant circuit which must be adjusted so that it is centered on the carrier frequency. An oscilloscope is needed for this adjustment, and a signal generator, set to generate a 77.5 kHz sine wave, is also very useful. This signal is fed, at an amplitude of a few milli-volts, into the antenna input. With the oscilloscope connected across C4 and C5 to monitor the signal on the output resonant circuit, trimmer C5 is adjusted until maximum amplitude is observed.
It is essential that the transformer used is suitable for constructing a resonant circuit at the carrier frequency. Our proto-type used a FT50-77 core from Amidon on which we made two 57-turn windings. It is also possible to trim the resonant frequency of the circuit by using a transformer whose core can be adjusted in and out. In this case, of course, the trimmer capacitor can be dispensed with. Rainer Reusch Elektor Electronics 2008
Friday, October 24, 2014
74LS247 7 Segment Display Circuit
The displayor using a 7 segment display in electronic device applications is drain port of a microcontroller or data that would point in the show, especially when the data would be displayed more than 1 digit. necessary path to control the resources of each 7 segment and the path to input data on the 7 segment.
Series Display 7 Segment 4 Digit Multiplex is a way to save the port or microcontroller data path that will be displayed. Series Display 7 Segment 4 Digit Multiplex uses BCD to 7 segment decoder 74LS247 BCD to encode data from the data that will be displayed, then for each resource viewer 7 segment using the set of transistors as electronic switches. Current flowing in the viewer in a series of 7 segment Display 7 Segment 4 Digit Multiplex is in limiting use yag resistor in series pairs in each collector transistor.
Image Series Display 7 Segment 4 Digit Multiplex
Configuration circuit components 7 Segment 4 Digit Display Multiplex
The legs LT, RBI, RBO in this circuit is not connected (logic high) is meant to display data from the seven segment according to data from the microcontroller. Resistors are mounted a series of LED is used as a barrier for current flow that flows through the LED does not exceed the maximum allowable current that is equal to 20 mA.
Thursday, October 23, 2014
Class A headphone amplifier diagram
Class A headphone amplifier
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| Class A headphone amplifier |
SMS Remote controller circuit
SMS Remote controller is a device used to control a device remotely using SMS through GSM mobile phones. Process control equipment with a series of AVR ATTiny To SMS Remote Controller can be used to control life and death of these equipment will provide information on the status of replies to our phone in return successful command execution.
Equipment can be controlled by a series of AVR ATTiny To SMS Remote Controller include lights, water pumps, garage doors, gates and much more. AVR series ATTiny To SMS Remote controller uses the module-47 Sony ericson GM as recipient and sender of the SMS module. Then to the SMS data processor on a series of AVR ATTiny To SMS Remote controller is using AVR microcontroller ATTiny 2313.
Series AVR ATTiny To SMS Remote Controller
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| SMS Remote controller circuit Click to view larger. |
AVR circuit this part ATTiny To SMS Remote Controller
AVR series ATTiny To SMS Remote controller uses the AVR attiny2313 with 4MHz clock frequency, GSM Module GM trnceiver 47 Sony ericson, SIM Card, 4 relays and an IC regulator. ATTiny AVR microcontroller 2313 can work well on the voltage 2.7 VDC - 5.5 VDC for working with the frequency at 10MHz bahwah.
The set of AVR ATTiny In SMS Remote Controller To make use of this power supply from the batteries 3.3 VDC. Connection using a SIM Card SIM Card Holder which is connected to the module GM-47, AVR series ATTiny To SMS Remote Controller works with communication between AVR ATTiny and GM-47 module at 9600bps. In a series of AVR ATTiny To SMS Remote controller is equipped with LED D6 as an indicator of the data interconnect GM-47 module with cellular operators where this LED will light continuously when not apat network and will be lit by flashes when a signal from the operator.
Specifications AVR series ATTiny To SMS Remote Controller
- 4 Relay for ON / OFF electronic devices
- 8 input lines for reading in a normal switching
- LED indicators signal operator
- SMS command with password, so only the owner can operate
Power Amplifier for Audio Laptop
Frequently, the sound yield from a laptops fabricated-in speakers is flat. A capacity intensifier is needed to get an elevated volume. Here is an effortless circuit to intensify the laptops sound yield.
The circuit is constructed around capacity enhancer IC LA 4440 (IC1) and a few alternate parts. LA4440 is a double channel sound capacity speaker. It has level twisting over a vast run of flat to towering frequencies with exceptional channel detachment. Inbuilt double channels prepare it for stereo and extension speaker provisions.
In double mode LA4440 gives 6 watts for every divert and in scaffold mode 19-watt yield. It has swell denial of 46 dB. The sound impact might be grasped by utilizing several 6-watt speakers. Associate binds 2, 6 and ground of IC1 to the stereo jack which is to be utilized with the laptop. Collect the circuit on a customary-reason PCB and encase in a suitable bureau. The circuit works off managed 12V capacity supply. It is suggested to utilize sound enter socket in the circuit plank. Utilize a decent hotness-sink for LA4440.
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