defgf67ay
Dołączył: 29 Paź 2010
Posty: 863
Przeczytał: 0 tematów
Ostrzeżeń: 0/5
Skąd: England
|
 Wysłany: Wto 7:26, 07 Gru 2010 Temat postu: ghd glätteisen Laser Alarm _1056 |
 |
|
,[link widoczny dla zalogowanych]
Laser Alarm
The same chassis, sharing a common power supply, because the receiver is less than the average power consumption 10mA, therefore, will immediately find that the laser is the most power-hungry devices. Mirrors can be used to target the laser beam as needed. The drawings are given to set the example of the laser beam and the effective protection of the alarm area. In the schematic, there is a TL072 op amp (IC1.A), here used as a voltage comparator, which input is adjustable to provide the reference voltage divider PI/1/4, and the other input is fixed by the photodiode D1 and Resistor R3 provides the composition of the light-sensitive voltage divider. When the laser beam is cut off, the comparator voltage on pin 2 lower than the voltage on pin 3, so that IC1. A few flat near the positive output supply voltage, that the state into eight alarm. This output signal can be used to drive a strong alarm, a computer or a warning light in order to safely detect the laser beam interrupted. Of course, there can be another way to \Resistor R2 to provide a time delay, in order to avoid the two comparator input voltage is almost equal to oscillate. Capacitor C1 can avoid the laser beam caused by flying insects + UB +5. . +9 V19 brief interruption of false positives. If you want faster response of this circuit, the value of C1 can be reduced to 1F. This circuit is simple, can be assembled in a \After assembling the circuit can be tested, then the board needs only a small hole into the black box inside. Lasers can also release the same box, but the need to ensure photodiode does not directly \Black holes on the shield should be added to ensure that only the orientation of the laser beam to enter and accurate placement of the laser beam and mirrors can be enhanced laser to, even if the sun would not affect the orientation of the operation of the photodiode. Caution must be observed when the laser must pay attention to safety. Laser power should be as low as possible. When used as long as the input voltage transient voltage rectifier, the bridge rectifier is very easy to increase the number of losses. Drop foot bridge on the road 1.5V,[link widoczny dla zalogowanych], 6V input voltage which is 25%. Schottky diode loss can be reduced using ~ E50%, but this is clearly not enough, it is best to zero the actual loss. This can be achieved, as long as a synchronous rectifier. This means that with an active switching system to replace a \The principle is very simple: when the input AC voltage is larger than the instantaneous value of the rectified output voltage, MOSFET to turn, allowing current to flow from input to output. Full-wave rectifier because of the need to be with four FET (T1 a T4) instead of four diodes, so that it constitutes a bridge rectifier. R1-1t4 form a voltage divider has been rectified,[link widoczny dla zalogowanych], and R5 R8 as the AC input voltage of a divider. For, and also do not have any rectifier voltage. So, how the circuit start it? Lucky is. F stare all have internal diodes. Which allows the circuit to start the (lossy). FET selection is not strict, as long as not too hot hand on the top retracted, so that the tube can be used, but should pay attention. Loss depends on the dry tube resistance. Now, 20 to 50mW of the FET is very common. 50A FET can handle this magnitude of current. Because the average current of 5A in the FET may have a 50A peak current. No longer used IKFz48N of production, but still bought,[link widoczny dla zalogowanych], of course,[link widoczny dla zalogowanych], use other models. For example IRF4905 can handle 55V, 74A, its resistance to 20mn. Input voltage greater than 6V, the proposed increase in the value of 8.2kn resistance, for example, 9V with 15kn, 12V with 22kn.
More articles related to topics：
[link widoczny dla zalogowanych]
tory burch shoes Airborne electro-optical tracking
Laguna Beach Jeans School Talk about the emperor -
Post został pochwalony 0 razy
|
|
