Dreaming is a private thing, so it cannot really stood the test of scientific investigation methods. However, 18th century United Kingdom poet gaoerliezhi said he had heard someone in the dream of a verbatim recitation "Kublai Khan" poem. Switzerland psychiatrists found Jung of dreams is the secret depths of thought one "hidden", the Bible, to Pharaoh's dreams in detail and Joseph saved Egypt threatened by famine. Can you say, do Gao Erlie treatment is a fraud? Jung and all modern psychiatrists did borrow his skills are being misled?
Joseph smart intervention in Egypt's economy is a lucky chance event? Dream machine is everyone happy to assembling and testing of production, it is also very useful.
Its function is to produce relaxation hypnotic signals will help you sleep well at night sleep. We think sleeping is a time to rest, but most nights are spent in a State of tension, and unable to achieve a recovery effort. The intended purpose.
I want to feel wide awake and energetic when getting up in the morning without dazed and tears blurred. Dream machine principle is to generate pink noise.
Pink noise sound similar to the sea shore of roaring, the forest of the wind or rain, is very rich poetic sounds make people relaxed voice. If power and change is inversely proportional to the frequency of noise with more low (red) frequency, so called pink noise.
Semiconductor device, 1/f (Pink) noise in the 1KHz the following dominant.

Starts to assemble a dream machine, you must decide is only a simple assembly of parts or assembly of the entire production, because the layout is slightly different between the two components. Simplified circuit allows you to spend more than you can taste a taste of a dream machine. Figure (1) is its schematic. You must be connected to its output amplifier to hear high-fidelity sound. Figure (2) is the dream machine of the expansion of the circuit which has its own power supply, amplifier, speakers, and controllers.

Circuit Work
In Figure (1) simplify the circuit, zener diode noise voltage generated by a gain of 21 / 2 of TR1 as a buffer and amplification. Slightly higher frequency capacitors to filter out, according to put the audio output fed to an external amplifier.
Figure (2) dream machine a little complicated, but in principle very similar. It can change the sound volume and tone, and the circuit's output adjusted to maximum. Adjust RV1 ZD1 working conditions, it can produce the maximum output. TR1 enlarge the output of many, RV2 adjust the steepness of high-frequency cutoff. IC1 to amplify the sound and then drive speakers.
The voltage regulator IC1 gain of R4, C6 reduces the gain of the amplifier at high frequencies and make it stable. R5 and C9 to be more resistant to high-frequency amplifier for the load transient response and stability. IC2 is the regulator, the circuit provides a fixed 12-volt power supply.
Test
Before applying power, make sure the fuse holder for fuse inside, and to check the power of cable. Pre-withered, and the other two potentiometers RV1 potentiometer should be adjusted in the middle position. After the dream machine power, and if all goes well, you can hear the gentle hiss the speaker if the speaker have other voices, we should immediately turn off the power.
If the speaker did not sound, you should check whether the neon light, if the neon does not shine, then turn off the power, and once again check the fuse and power connections, if the neon light, used a multimeter check the voltage across filter capacitor C12 is about 17 volts. If not, check the power supply components, in particular, work to ensure that the rectifier.
If the above - cut normal, to check the circuit board after the power surge by the IC2 is not 12 volts. Almost certainly be too high voltage regulator is damaged, or the voltage regulator (IC2 the center of the pin welding bad. Voltage regulator is too low and the joint is very hot in some places, said welding circuit board or damage to IC2 the. In either case, must turn off the power to prevent the spread of failure.
After all the examination was normal, adjust RV1 to see whether the sound, it slowly from one end to another end, if still no response, with little contact with RV3 wet in the center of that pin, if IC2 working properly, the speaker on will issue a significant hum. For further testing to avoid touching the power of the press line. If the test can not come into contact with your fingers get reaction from the amplifier can be removed from the RV3 lead 1, try again - all over, if still no response. Part of the circuit of the amplifier is a failure.
Mode to see if the fever IC1 touched. If there is no fever, you can check the voltage throughout the circuit board to identify problem areas. Multimeter connected to IC1 pin 4, anode, cathode over 6 feet, to see if 12 volts. Check whether C8 is the positive 12 volts, if not, to check the speaker cable.
IC1 pin 5, the voltage should be 6 volts. If not, can be 3 and 4 feet together, if this time the voltage is 6 feet 5 volts, it would have to check the wiring of the RV3. If the voltage is still not the 6-volt, retaining the connection of two pins, one end of C7 then removed from the circuit board. If this can pin voltage is equal to 6 V 5, that is, C7 is broken, to have it replaced.
If you still can not, the wiring can be connected to the C7, and then remove the C5's a connection, if it can eliminate the fault, we should C5 be replaced; If you can not eliminate the fault, the wiring can be back to the C5, and then on the C6 for the same examination.
If these tests are not valid, that is damaged IC1, to have it replaced. If you do not quite trust your welding technology, it is best to use the IC socket, the IC is the most vulnerable components on the board.
If the amplifier part of the circuit board to work (in contact with your fingers hum, a noise but did not), you can check between TR1 collector and the emitter voltage, it should be at least 1.5 volts, if greater than 1.5 volts. It does not matter. If less than 1.5 volts, can try adjusting RV1. If you do not make it coordinated, you can use a 4.7K resistor across the S and 2 in the RV2 both ends (Figure 4). If this does not work, it should detect the voltage across R2 and C3. Under normal circumstances, the voltage across R2 and C3 should be around 2.5 volts, according to the regulation of RV1 change. Adjust RV1 If the voltage does not change, you can check the voltage of zener diode ZD1, if not 6.8 volts, the zener diode is bad, then, and then check the TR2 emitter voltage. If the regulator RV1 emitter voltage is not making changes, it should be suspected broken RV1 or TR2. If the emitter voltage of TR2 that with the RV1 and change, but the emitter of TR1 with the V1 and the use of pressure did not change, it could be any question of the TR1.
Across both ends of the resistance in the RV2 If it helps, you can still stay there. IC1 test is completed, to immediately remove the IC1 pin connection between 3 and 4. When everything is working, be careful to adjust RV1 to achieve maximum volume, then you can close the lid, ready to go dreaming.
The use of dream machines
Dream machine on the night restless children to sleep is particularly useful, it also allows other family members sleeping.
The dream machine on your bed, adjust the volume and tone controls to suit your requirements, then lying in bed, focus on its sound. Too - will, it is beginning to hypnotic effect, and soon you will be sound with the people sleep.
If you wake up the morning after, really want to get up, if you feel vibrant and very clever way to work and would not fall asleep, you know. Sleep well at night, and the first few this happens, you will think it is unusual.
If you used a dream machine, you'll notice some dream of the experience. If you can dream of full control of the action, this conscious dream is very exciting. In the dream you can do whatever they want, no one will whisper your dreams, because only you know what a dream.