A serial to parallel converter using the AT89C2051

The example program included with the PG2051 evaluation kit is a basic serial to parallel converter written in 8051 assembler. This is probably a good example of the uses to which an AT89C2051 can be put - it would be hard to get a serial to parallel converter much simpler than the single 20 pin IC in this circuit. The program is meant to serve as a useful example of 8051 serial routines and other programming, whether or not you actually need a serial to parallel converter.

Source: http://airborn.com.au/serial/sertopar.html

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Surround Sound pro the insignificant Ones

If you maintain a line with the purpose of loves movies and melody the top gift you can undertake physically is a instant household drama for the little ones. really, how many period has the Sunday game interfered with otherwise been interrupted to the little individuals needs to watch Disneys most up-to-date and supreme flick? I know these meltdowns occur far too frequently hip my household. This is why a minute home acting is an exceptional clue. Your children find out of the essence training and you persuade to watch television on occasion devoid of tantrums and meltdowns.

nearby are many payback to you in support of building a secondary home drama classification not the slightest of which is emergency parts be supposed to everything interminably turn out to yours. I know taking part in our abode I was concerned so as to I would in no way check the kids on one occasion we built a system in favor of them but the sincerity is they each one include altered tastes since well and now and again favor come again? we are watching above what brother and/before sister are watching. We moreover have the information with the aim of our television is still better than theirs and in attendance is continuously that to take out them back into the land-living of the living somewhat than holing up fashionable their basement show business disappear away. 

Getting back to the reimbursement, the kids are learning to take turns even establishing a schedule and sticking to it. They are learning to concoct to blame choices and even to drudgery concurrently on occasion and compromise in help of watching all of favorite programs to facilitate are close to finale but not quite completed. Its big to envisage them cooperating slightly than fighting all the stage. It too allows them a place to take their acquaintances once they occur above with the intention of they are reliable instead of cleaning up and keeps the fix away from home of our internal show business break (my not public favorite infer for having two home theaters).

For even other profit after it comes to a be with home show business within your home is to facilitate your children gain knowledge of very quickly come again? it agency to break something such such as the components in their home show business and arent likely to work out so again. It teaches trustworthiness on a level to facilitate nearly all toys that are lost and smashed lone week in the same way as Christmas may well not at all contract across. They understand to take attention of the equipment, to wipe inedible the fingerprints, not to perplex things by the side of it, and not to lug it inedible the shelves and leave it on the floor for example they see to with their other toys. This is something to matters to them and I tolerate been amazed next to how well they have taken care of it.

in the end, a mother country the stage organism is an grand tool meant for branch of learning. The menace of not allowing one individual before all of them not to watch their home the stage with surround sound or else any other television dressed in the household for with the aim of substance is a destiny worse than death on behalf of them on the whole of the stretch and adequate to make them to tread on the straight and narrow. The little era this privilege has been revoked bear been quite efficient in creating a much extra co-op feel of harmony next to home otherwise at train.

While nearby are many who believe with the intention of a local the stage before surround sound method representing the kids is heavy-handedness I tightly believe with the purpose of it is an incredible privilege and task that prepares them to deal with the planet outside having the status of they grow adult. They are already learning almost negotiation, cooperation, and respect.

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Automatic Night Light Feeds Directly From the AC Line

There are many approaches to the problem of activating a light when it becomes dark, and a recent Design Idea covers this topic (Reference 1). Some approaches require a dc power supply and an electromechanical relay, but a better approach involves feeding the device directly from the ac line, minimizing the number of components 

(Figure 1).

Figure 1. The photoresistor activates the TRIAC and the load when darkness falls.

The heart of the device is a light-sensitive cadmium-sulphide resistor, PR, with a resistance of approximately 200 kΩ in the dark and decreasing to a few kilohms in the light. PR and capacitor C1 form an ac-voltage divider. In daylight, the voltage across PR is too low to generate the required gate-trigger current to turn on bidirectional ac switch Q1, thus keeping the load – usually a lamp – off. When it becomes dark, PR’s resistance rises, resulting in an increase in the TRIAC’s gate current that triggers the TRIAC and lights the lamp.

The schema uses inexpensive, off-the-shelf components, including the VT90N1 photoresistor; a 0.1-μF, 275V capacitor; and an L2004F61 TRIAC with a load current of 4A rms, a peak blocking voltage of 200V, and a gate-trigger current of 5 mA. The exact specifications of these components are not critical; you could use others instead.

Editor’s note:
Attributes worth mentioning include the fact that the capacitor introduces a phase shift, which places the peak of the gate voltage close to the zero crossing of the load’s sine wave for optimum turn-on timing. Another benefit is thermal hysteresis, which occurs due to the reduction of the required triggering voltage and current as the TRIAC warms up after the initial turn-on. 

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Samsung will introduce the Galaxy Note 4 on 3 September

It is expected that Samsung present its new phone Samsung Galaxy Note 4 officially in September during IFA 2014 event held in Berlin, Germany. Now, the Korean media already have an exact date of this phone Samsung.

According to The Korea Times, Samsung will be announcing the Galaxy Note 4 on September 3, a day before the presentation of the Galaxy Note 3 last year.

Samsung is expected to start sending invitations to the event "soon", including that the company would be a bit rushed to launch its new mobile big Lcd because Apple is finally breaking its tradition of offering only one size cell relatively small as the iPhone 6 to gain entry to the high-end market. It is said that Samsung is trying to get the Galaxy Note sale 4 days before what went on Galaxy Note 3 with this same purpose.

It is expected that the Samsung Galaxy Note 4 has a QHD (2560 × 1440) 5.7 inch Lcd, a Snapdragon 805 / Exynos 5433 processor, 3GB of RAM and a 16 megapixel camera that would include the Sony IMX240 sensor. Additionally, he said that the Samsung Galaxy Note 4 would an ultraviolet sensor and Android KitKat.

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Trick jumper switches on the mobile phone antenna

Trick jumper switches on the mobile phone antenna this will affect the capability dual-band mobile phone into one band only, ie 900 MHz.

This trick is very useful to get around the limitations of funds. If you do not want to lose the ability to dual-band mobile phone into one band only, then the alternative is to make the turn with a new IC PA.

ANTENNA JUMPER DIAGRAM

MMI strives to provide complete and accurate information, but MMI is not responsible for any errors / damage that occurs in the use of information we provide.

 

	Noki GAGE QD	Nokia 90
Nokia 6070

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The Gentle Touch Wiring diagram Schematic

The Gentle Touch Circuit Diagram. Consumer appliances these days hardly ever have a proper mains switch. Instead, appliances are turned on and off at the touch of a button on the remote control, just like any other function. This schema shows how a device (as long as it does not draw too high a current) can be switched on and off using a push button. The approach requires that a micro controller is already available in the schema, and a spare input port pin and a spare output port pin are required, along with a little software. When power is applied T1 initially remains turned off. When the button is pressed the gate of T1 is taken to ground and the p-channel power MOSFET conducts. The micro controller schema is now supplied with power. Within a short period the micro controller must take output PB1 high. This turns on n-channel MOSFET T1 which in turn keeps T1 turned on after the push-button is released.

Now the micro controller must poll the state of the push-button on its input port (PB0) at regular intervals. Immediately after switch-on it will detect that the button is pressed (a low level on the input port pin), and it must wait for the button to be released. When the button is next pressed the device must switch itself of f: to do this the firmware running in the micro controller must set the output port pin to a low level. When the button is subsequently released T1 will now turn off and the supply voltage will be removed from the schema.

The schema itself draws no current in the off state, and for (rechargeable) battery-powered appliances it is therefore best to put the switch before the voltage regulator. For mains-powered devices the switch can also be fitted before the voltage regulator (after the rectifier and smoothing capacitor). Since there is no mains switch there will still be a small standby current draw in this case due to the transformer. Be careful not to exceed the maximum gate-source voltage specification for T1: the IRFD9024 device suggested can withstand up to 20 V. At lower voltages R2 can be replaced by a wire link; otherwise suitable values for the voltage divider formed by R1 and R2 must be selected.

 The Gentle Touch Circuit Diagram

The author has set up a small website for this project at http://reweb.fh-weingarten.de/elektor, which gives source code examples (which include dealing with pushbutton contact bounce) for AVR microcontrollers suitable for use with AVR Studio and GNU C. Downloads are also available at http://www.elektor.com.

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Use the CD ROM drive as a audio CD player without the computer

Most of the CDROMS available have an Audio-Out Output to either plug in the headphones or connect it to an amplifier.This schema enables one to use the CDROM as a stand alone Audio CD player without the computer.This schema is nothing but a power supply which supplies +5v, +12V and Ground to the CDROM drive and
hence can be used without the computer.




You should buy a D-type power connecter to connect this diagram outputs to the CDROM. The details of the D connector are shown along with the schema diagram. Note that the D-connector goes into the CDROM in only one way and hence prevents any damage due to wrong connection. Ensure that the 12V(yellow) wire is connected to the right of the D-connector(as seen from behind ,i.e the connector holes away from you with the curved portion of the connector upwards) As soon as an Audio CD is inserted, the CD begins to play. To move to the next track, press the Skip-Track button on the CDROM front Panel.

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Big Power Supply Cicuit to the Power Amplifier

Created by Bustamsyah Bain.

The Power Amplifier must use a big power supply schema, due to great sound must also be supported with power (power supply) that great anyway. In the power amplifier 1000W (500W (L) and 500W (R) can work if driven by transformers least 10A. Diode bridge and Electrolite - capacitor (elco) must have a value too big. Average power amplifier can work if given the power consumption of the transformer between 2x24V to 2x80V, or more.

Indeed, the power amplifier can reach 40kg weight. But now some products speaker / Power Amplifier system known already implemented switching power supply with electronic methods. imagine if there is an active speaker / power amplifier transformer that uses ordinary (conventional), weighing up to 40 kg, but the active speaker / power amplifier system that uses switching power supplies only 20kg.

Ok, we return to the basic power supply of conventional systems. In the big power supply to the power amplifier used transformers worth between 5-30A and voltage 24-80V.
Bridge diode and elco have big capacity. Bridge diode adapted to the size of transformers, ranging elco 2x4.700uF to 2x10.000uF with voltage 63-100V. Used to filter capacitor 100nF. The power supply system using symmetrical power supply.
sometimes equipped with dual output transformers are symmetrical, ie the first 2x24V10A secondary, secondary and two 2x15V 1A, for example.
the second secondary (2x15V) used for pre amp Amplifier OP. TRANSFORMER CT connection is usually connected to the grounding (box).
but do not directly connect the grounding cable to the CT, because it will cause hum. Wiring must be correct, the wiring system distributed by the regulator power supply to each termauk to grounding equipment.

Big Power Supply Cicuit to the Power Amplifier.

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