Friday, December 27, 2013
Burglar Alarm With Timed Shutoff Circuit Diagram
When SI (sensor) is closed, power is applied to U2, a dual timer. After a time determined by C2, CI is energized after a predetermined time determined by the value of C5, pin 9 of U2 becomes low, switching off the transistor in the optoisolater, cutting anode current of SCR1 and de-energizing Kl. The system is now reset. Notice that (i6x C2) is less than (R7xC$). The ON time is approximately given by:(R7xC5)-(R6xC2) = Ton
Burglar Alarm With Timed Shutoff Circuit Diagram
Wednesday, December 25, 2013
Memory Save on Power down Circuit Diagram
Memory Save on Power down Circuit Diagram. The auxiliary output powers the memory, while the main output powers the system and is connected to the memory store pin. When power goes down, the main output goes low, commanding the memory to store. The auxiliary output then drops out.
Memory Save on Power down Circuit Diagram
/Monday, December 23, 2013
Build a 5 Zone alarm Circuit Diagram
This is a complete alarm system with 5 independent zonessuitable for a small office or home environment. It uses just 3CM IC`s and features a timed entry / exit zone, 4 immediatezones and a panic button. There are indicators for each zone a“system armed” indicator. The schematic is as follows:
5 Zone alarm Circuit Diagram
Circuit Notes:
Each zone uses a normally closed contact. These can be microswitches or standard alarm contacts (usually reed switches).Suitable switches can be bought from alarm shops and concealed indoor frames, or window ledges.Zone 1 is a timed zone which must be used as the entry andexit point of the building. Zones 2 – 5 are immediate zones,which will trigger the alarm with no delay. Some RF immunity isprovided for long wiring runs by the input capacitors, C1-C5. C7and R14 also form a transient suppresser. The key switch acts asthe Set/Unset and Reset switch. For good security thisshould be the metal type with a key.
Operation:
At switch on, C6 will charge via R11, this acts as the exitdelay and is set to around 30 seconds. This can be altered byvarying either C6 or R11. Once the timing period has elapsed,LED6 will light, meaning the system is armed. LED6 may be mountedexternally (at the bell box for example) and providesvisual indication that the system has set. Once set any contactthat opens will trigger the alarm, including Zone 1. To preventtriggering the alarm on entry to the building, the concealedre-entry switch must be operated. This will discharge C6 andstart the entry timer. The re-entry switch could be a concealedreed switch, located anywhere in a door frame, but invisibleto the eye. The panic switch, when pressed, will trigger thealarm when set. Relay contacts RLA1 provide the latch, RLA2operate the siren or buzzer.
Sunday, December 22, 2013
Touch Free Timer Switch
This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example, we commonly see use of infrared proximity sensors on public drinking fountains and in public washrooms. The simple circuit presented here can be operated by moving your hand in front of it. This is achieved by detecting the infrared light reflected by your hand onto a receiver device.
Fig. 1: Touch-Free Timer Switch Circuit diagram :
Fig. 1 shows the circuit of the touch-free timer switch. It has two sections: transmitter and receiver. The IR transmitter is built around timer LMC555 (IC1), which is wired as an astable multivibrator. The multivibrator produces 38kHz pulses (at low duty cycle) that drive an infrared LED (LED1). This frequency can be tuned using a 10-kilo-ohm preset (VR1). A 220-ohm series resistor (R3) ensures that the current consumption of the IR transmitter is not out of arrangement.
The receiver section is built around IR receiver module TSOP1738 (IRX1), timer LMC555 (IC2) and a few discrete components. The TSOP1738 is an integrated miniaturised receiver for infrared remote control systems. Everything required for IR signal processing, including the PIN diode and preamplifier, are assembled on a lead frame and the epoxy package is designed as an IR filter.
When a short IR burst is received by IRX1 (as you wave your hand in front of the switch), the demodulated pulses are fed to the trigger input (pin 2) of the second LMC555 (IC2). This, in turn, triggers the monostable wired around IC2 and its output pin 3 goes high for a period determined by the 2.2-mega-ohm potentiometer and capacitor C5. This turns off the standby indicator (LED1) and transistor T1 conducts to drive the 5V relay (RL1). LED1 enables you to locate the switch in the dark. AC mains supply to the load to be switched-on is routed through the pole and normally-opened contacts of RL1 as shown in the diagram. The circuit works off regulated 5V DC.
Fig. 2: Pin configurations of TSOP1738, IR LED and BC547
Fig. 2 shows the pin configurations of TSOP1738, IR LED1 and transistor BC547. Assemble the circuit on a general-purpose PCB and enclose in a small plastic cabinet. Fit IR LED1 with a reflecting hood at a recessed position on the front panel of the enclosure. The dome-shaped face of the TSOP1738 should stick out from the front panel. Fit the time-control potentiometer (VR2) in an appropriate position. Finally, fit the standby indicator LED1 inside a suitable LED holder such that it slightly protrudes from the front panel. To prevent unwanted reflection of the IR beam, the finished unit should be mounted such that it does not face a nearby wall.
Fig. 3: Suggested enclosure
Using high-precision linear potentiometer VR2 and capacitor C5 (100µF), the time length can be set from nearly 1 second to 120 seconds. Attach a small paper dial on the front panel of the enclosure and mark various positions of the control knob of VR2 as shown in Fig. 3. The accuracy of the timer depends mainly upon the quality (and value) of timing capacitor C5. In practice, most electrolytic capacitors are rated on the basis of minimum guaranteed value and the real value may be higher.
Source : http://www.ecircuitslab.com/2012/08/touch-free-timer-switch-circuit.html
Friday, December 20, 2013
Build a 13KV High voltage Power supply Circuit Diagram
This 13KV High voltage Power supply Circuit Diagram has an inverter around Q1 that supplies 150-V pulses to the converter of SCR1 and C2. The output of ?2 is a 4.5-kV pulse that is multiplied by the voltage-tripler network (right) to produce 13.5 kV. R1 is a 3k to 500K CT transistor audio transforfiler, L2 is a flash tube trigger transformer with a 6-kV secondary.
13KV High voltage Power supply Circuit Diagram
Wednesday, December 18, 2013
50W Electronic Amplifier Rise
This electronic amplifier project is an IC amplifier module from ST Microelectronics, the TDA7294. It is intended for use as a top quality audio class AB amplifier in hi-fi applications. Its low noise and distortion, wide bandwidth and nice output current capability, enabling it to supply high power in to both four ohm and 8 ohm lots. Its both short circuit and thermal protection.
With the addition of a handful of parts and an appropriate power supply, this module will deliver over 50W RMS in to four or 8 ohms-with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Inter-modulation Distortion (IMD). It is also suitable as a replacement power amp stage, or upgrade for plenty of existing amplifiers of between 30W-50W, provided they have an appropriate dual supply, & most do.
With the addition of a handful of parts and an appropriate power supply, this module will deliver over 50W RMS in to four or 8 ohms-with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Inter-modulation Distortion (IMD). It is also suitable as a replacement power amp stage, or upgrade for plenty of existing amplifiers of between 30W-50W, provided they have an appropriate dual supply, & most do.
The Specifications of the electronic amplifier project there are:
D.C. Input : 35V
Output power : > 50W RMS, 4-8 ohm load.
Gain : 24 dB (30dB modification)
Input sensitivity : one.3V for 50W, 8 ohm
Signal-to-Noise ratio : > 95 dB, (>105 dBA)
Frequency response : approx. 20Hz - 200kHz, �3 dB
Slew rate : > 10V/uS
THD : < 0.01%, 1W-40W, 1kHz
IMD : < 0.01%, 1W
D.C. Input : 35V
Output power : > 50W RMS, 4-8 ohm load.
Gain : 24 dB (30dB modification)
Input sensitivity : one.3V for 50W, 8 ohm
Signal-to-Noise ratio : > 95 dB, (>105 dBA)
Frequency response : approx. 20Hz - 200kHz, �3 dB
Slew rate : > 10V/uS
THD : < 0.01%, 1W-40W, 1kHz
IMD : < 0.01%, 1W
The maximum supply voltage of the IC is +/- 40V. However the maximum dissipation of the IC can be exceeded even at a lower voltage. Therefore the supply voltage used require not be over +/- 35V. This can be constructed using a 50V middle tapped-transformer, a diode bridge rated at 5A (min.) & a pair of electrolytic capacitors, as shown below. A lower secondary voltage transformer could even be used but the reduced DC voltage will lead to less power output in to 8 ohms. You can still receive 50W in to four ohms with only 24V supply rails.
A 36V C.T. transformer will give you approx +/- 25V rails. The-mains transformer used ought to be rated at a maximum of 80VA. In the event you require to run modules in a stereo amplifier you can use a common power supply. In this case the transformer ought to be rated at 150VA or greater.
A 36V C.T. transformer will give you approx +/- 25V rails. The-mains transformer used ought to be rated at a maximum of 80VA. In the event you require to run modules in a stereo amplifier you can use a common power supply. In this case the transformer ought to be rated at 150VA or greater.
Electronic Amplifier Circuit Diagram Description
Most of the circuitry is contained within the IC module. The input signal is applied to pin three by capacitor C1 & low-pass filter R1/C2. The filter improves the pulse response & helps cease RF signals. The lower -3dB point is determined-by R2/C1 & R4/C3. This is about 20Hz for the values used. The upper -3dB point is over 200kHz. C7/C8 & C9/C10 provide additional power supply filtering or decoupling.
.gif "50W Electronic Amplifier (Rise)")
R3/R4 are the feedback resistors. The gain is 1+R3/R4 which is approx 16 times, or 24dB. In case you need to increase the input sensitivity you may alter the resistors to suit. Changing R3 to 22k would increase the gain to 30dB and lower the input-required for 50W in to 8 ohm, to 0.6V, without affecting performance much. In case you reduce the worth of R4 you will also need to increase C3 to maintain bass response, as this sets the feedback low frequency roll off.
Pin ten is a mute input and pin 9 provides a standby mode. Muting ought to always happen before standby mode is selected. Connecting these pins permanently to the supply rail ensures that the amplifier comes on immediately on power up. Any switch-on clicks may be eliminated by increasing the time constants of R5/C4 and R6/C5 if necessary.
Make definite that a heavy duty heat-sink rated at least one.4 degree C/W or better is used.
Pin ten is a mute input and pin 9 provides a standby mode. Muting ought to always happen before standby mode is selected. Connecting these pins permanently to the supply rail ensures that the amplifier comes on immediately on power up. Any switch-on clicks may be eliminated by increasing the time constants of R5/C4 and R6/C5 if necessary.
Make definite that a heavy duty heat-sink rated at least one.4 degree C/W or better is used.
Tuesday, December 17, 2013
It is the information of manufacturing cell phone jammers
It is the information of manufacturing cell phone jammers
What is a "soft solution"? The "soft solution" is referred to as "software unlock". What is "unlocked"? Unlock unlock solution is the network operator lock. Why Why do cattle fork phone AT & T sold $ 199? It is because of the lock. Locked a cattle cross the mobile phone, you can only use his phone card, let him make money. Mobile effort can only be inserted mobile card, you can not use other operators network. But some countries the law: "Do not engage in technological monopoly, the consumer is God, he wanted to use the the Han net with Han network, as long as God give money, you have to let him use the card of the other operators." So, "Xie lock "was born. How to unlock the operators of the things of God are paying. The life time of cell phone jammers can be prolonged further.
Such as the Australian version. There is a word called "lock", that is, there is no network lock. For example, the official website of the Order of the Hong Kong version. No lock Well no lock, the price can not stand. Some national laws do not protect the God who spend money, such as the United States. Buy no lock? The next life. So some cattle fork incomparable God began to study, the Team DEV. They do a "software unlock program," This is the famous, extremely cattle fork YellowSn0w by operators can not "unlock" So God save money. The soft solution before there is a love to hate: "SIM" card affixed to the role and the soft solution to achieve a lock version to use third-party operators card. If the customer needs the suggestion about the installation and operation of cell phone jammers .
Or version updates (like XP to Vista). "Recovery" is the format reinstall, "update" is to keep the original program on the basis of an upgrade. Should be "update" is relatively slow, but the "recovery" will result in data loss in case of no backup. Firmware, probably the equivalent of operating systems or functions of the computer more advanced BIOS. The firmware upgrade (to restore or update) and the escape or not, do not conflict. But for a locked version of iPhone is already unlocked, regardless of the jailbreak or not, it should not upgrade the firmware, otherwise it will cause the iPhone is locked, it is equivalent to that before the firmware upgrade will make the unlock failure and can not be used (because cracking method will not be faster than the firmware version update. The manufacturer should purchase the material of cell phone jammers .
Although the hacker is very powerful, but Apples designers Is a vegetarian.) As for the specific conditions of this can not be used, when there are many. Not unlock the lock (only normal use, such as the American people to use AT & T network the iPhone), and lock-free version, the firmware upgrade does not matter, just before escape, the installed non-genuine copy of the App Store in the software may not be able to continue to use (of course some small software you can use, this should and software programming with Apples official detection limit). In addition, the firmware upgrade, it should be is the need to reactivate. But just to say, for a locked version of iPhone has been unlocked.
[Continue reading]
What is a "soft solution"? The "soft solution" is referred to as "software unlock". What is "unlocked"? Unlock unlock solution is the network operator lock. Why Why do cattle fork phone AT & T sold $ 199? It is because of the lock. Locked a cattle cross the mobile phone, you can only use his phone card, let him make money. Mobile effort can only be inserted mobile card, you can not use other operators network. But some countries the law: "Do not engage in technological monopoly, the consumer is God, he wanted to use the the Han net with Han network, as long as God give money, you have to let him use the card of the other operators." So, "Xie lock "was born. How to unlock the operators of the things of God are paying. The life time of cell phone jammers can be prolonged further.
Such as the Australian version. There is a word called "lock", that is, there is no network lock. For example, the official website of the Order of the Hong Kong version. No lock Well no lock, the price can not stand. Some national laws do not protect the God who spend money, such as the United States. Buy no lock? The next life. So some cattle fork incomparable God began to study, the Team DEV. They do a "software unlock program," This is the famous, extremely cattle fork YellowSn0w by operators can not "unlock" So God save money. The soft solution before there is a love to hate: "SIM" card affixed to the role and the soft solution to achieve a lock version to use third-party operators card. If the customer needs the suggestion about the installation and operation of cell phone jammers .
Or version updates (like XP to Vista). "Recovery" is the format reinstall, "update" is to keep the original program on the basis of an upgrade. Should be "update" is relatively slow, but the "recovery" will result in data loss in case of no backup. Firmware, probably the equivalent of operating systems or functions of the computer more advanced BIOS. The firmware upgrade (to restore or update) and the escape or not, do not conflict. But for a locked version of iPhone is already unlocked, regardless of the jailbreak or not, it should not upgrade the firmware, otherwise it will cause the iPhone is locked, it is equivalent to that before the firmware upgrade will make the unlock failure and can not be used (because cracking method will not be faster than the firmware version update. The manufacturer should purchase the material of cell phone jammers .
Although the hacker is very powerful, but Apples designers Is a vegetarian.) As for the specific conditions of this can not be used, when there are many. Not unlock the lock (only normal use, such as the American people to use AT & T network the iPhone), and lock-free version, the firmware upgrade does not matter, just before escape, the installed non-genuine copy of the App Store in the software may not be able to continue to use (of course some small software you can use, this should and software programming with Apples official detection limit). In addition, the firmware upgrade, it should be is the need to reactivate. But just to say, for a locked version of iPhone has been unlocked.
Subscribe to:
Posts (Atom)