Showing posts with label mini. Show all posts
Showing posts with label mini. Show all posts
Wednesday, November 19, 2014
Mini and simple power amplifier
What is the meaning of the picture above? The above picture is a miniature audio amplifier and very simple. Here I will give an audio amplifier schematic is very simple which only requires a few components only, can be seen under this scheme.
See from above scheme may occur to you, certainly cheap enough to make this amplifier and quite easy to make. The above simple audio amplifier circuit using an IC as the main amplifier and accompanied by other components. IC used is S1513, which requires a supply voltage ranging from 1.5 volts to 6 volts. And only 0.1 W output power with 4 ohm impedance. For a list components can be seen below.
Part list
C1 = 100nF
C2 = 100uF
C2 = 100uF
C3 = 3n3F
C4 = 1uF
C5 = 1uF
U1 = S1513
C5 = 1uF
U1 = S1513
Sunday, August 24, 2014
Mini Alarm
This schema, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched abruptly, the magnet looses its contact with the reed switch, SW1 opens, the schema starts oscillating and the loudspeaker emits a loud alarm sound. A complementary transistor-pair is wired as a high efficiency oscillator, directly driving a small loudspeaker. Low part-count and 3V battery supply allow a very compact construction.
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Parts:
R1 = 330K
R2 = 100R
C1 = 10nF-63V
C2 = 100uF-25V
Q1 = BC547
Q2 = BC327
B1 = 3V Battery or Two AA Cells in Series
SW1 = Read Switch & Small Magnet
SPKR = 8R Loudspeaker (See Notes)
Notes:
* The loudspeaker can be any type; its dimensions are limited only by the box that will enclose it.
* An on-off switch is unnecessary because the stand-by current drawing is less than 20µA.
* Current consumption when the alarm is sounding is about 100mA.
* If the schema is used as anti-bag-snatching, SW1 can be replaced by a 3.5mm mono Jack socket and the magnet by a 3.5mm. Mono Jack plugs having its internal leads shorted. The Jack plug will be connected to the tiny cord etc.
* Do not supply this schema at voltages exceeding 4.5V: it will not work and Q2 could be damaged. In any case a 3V supply is the best compromise.
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Parts:
R1 = 330K
R2 = 100R
C1 = 10nF-63V
C2 = 100uF-25V
Q1 = BC547
Q2 = BC327
B1 = 3V Battery or Two AA Cells in Series
SW1 = Read Switch & Small Magnet
SPKR = 8R Loudspeaker (See Notes)
Notes:
* The loudspeaker can be any type; its dimensions are limited only by the box that will enclose it.
* An on-off switch is unnecessary because the stand-by current drawing is less than 20µA.
* Current consumption when the alarm is sounding is about 100mA.
* If the schema is used as anti-bag-snatching, SW1 can be replaced by a 3.5mm mono Jack socket and the magnet by a 3.5mm. Mono Jack plugs having its internal leads shorted. The Jack plug will be connected to the tiny cord etc.
* Do not supply this schema at voltages exceeding 4.5V: it will not work and Q2 could be damaged. In any case a 3V supply is the best compromise.
Thursday, August 14, 2014
Samsung Galaxy Mini S5 will be waterproof
Met some possible specifications of Samsung Galaxy Mini S5, version thumbnail main business phone. At that time it was not clear if the Galaxy Mini S5 would also meet the IP67 certification provides water resistance up to 1 meter for 30 minutes, but now the official website of Samsung in New Zealand confirms all saying the warranty S5 Galaxy, Galaxy Mini and Galaxy S4 S5 Active remains valid if the devices within 1 meter of water for up to 30 minutes. More of this will affect the security of any such devices.
As for other specifications, do not expect it to be as powerful as the Galaxy regulate S5, would have a Super AMOLED screen of 4.5 inches with a 720p resolution, Qualcomm Snapdragon processor (possibly a Snapdragon 400), a main camera of 8 megapixel camera, a front 2 megapixel camera, 1.5GB of RAM, 16GB of storage, infrared, Android 4.4 KitKat and a battery of 2,100 mAh. Currently, it is unknown when Samsung might be presenting the Galaxy Mini S5, but it is most likely to be in the next three or four months.
As for other specifications, do not expect it to be as powerful as the Galaxy regulate S5, would have a Super AMOLED screen of 4.5 inches with a 720p resolution, Qualcomm Snapdragon processor (possibly a Snapdragon 400), a main camera of 8 megapixel camera, a front 2 megapixel camera, 1.5GB of RAM, 16GB of storage, infrared, Android 4.4 KitKat and a battery of 2,100 mAh. Currently, it is unknown when Samsung might be presenting the Galaxy Mini S5, but it is most likely to be in the next three or four months.
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