Toy Analog
Toy Analog
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Baby monitor that you need to know
Anybody who searches a baby monitor should learn all of thing about it first. Before investing your money in anything, important factors have to be taken into consideration. For example, the type of baby monitor should be thought of. You cannot just go out and pay for the first item that you see. You have to make sure that it is the right one for your baby. Basically, there are three different types of baby monitors that should be scrutinized.
The Baby motional monitor is the newest type of baby monitor. It makes use of sound and movement sensors to keep watch on the moves of the baby. The sensors are placed underneath the bed or mattress of the baby or wall round the baby. If it be not aware of any movement coming from the baby within twenty seconds, which means its alarm goes off to remind the parents.
Instead of buying baby monitor, parents also get their children with toys. People often question about the types of toys that they can buy to keep their newborn entertained while encouraging brain development. It's been proven that a baby's brain rapidly develops in the first two years of baby's life. It is also important the parents provide ways to stimulate the child's brain for the best development possible. Why can some inventor make the toy as monitor devices? Be played and monitor at the same time. And parents can save money as well.
A better choice is the video baby monitor. This one uses digital signals so that the parents can watch their baby sleeping soundly on a small colored monitor. This monitor is generally powered by rechargeable batteries. So, once it drains or runs out, it can easily be charged again. It is handy, portable, and can be taken anywhere in your house.
One of these is the classic sound wireless baby monitor. Recently, DECT technology is used to produce better transmission rates. This means that with this kind of technology, you will be not disturbed by signals from your neighbors. In the past, issues concerning interference are associated with analog baby monitors; but with these new baby monitors, you can be sure that all the sounds you will hear are only from your baby.
If you are in search of basic monitors, you may be interested in these types of baby monitor sold on the market, such as Analog Baby Monitors, Digital Baby Monitors etc, in which baby monitor is an updated version of analog baby monitor, and DCET (digital electronics current transducer) Sound monitor.
About the Author
can someone help me understand how to hook up a ADC(analog to digial converter), 0804LCN?
i know a lit bit bout ADC, but correctly hook it up to work. i tried following the datasheet but i still cant get it to work like i wanted. what im trying to do is have the changing sound level output to different voltages.(low sounds=2v-4v, high sounds 5v-7v, higher sounds 8v-10v etc...........) i woud like to have the output signal or voltage from the microphone, input to the ADC, and depending on the level of the sound thats going to be feed into the mircophone, it will activate that output. i would like to send tones or sounds over a walkie talkie or cell phone, a toy r/c car on the other end of the walkie talkie will have the mircophone and ADC. one sound or tone when activated, will make the car go foward, another tone will make it go backwards, another sound will make it go left...ect......
The ADC has little to do with what you are after. If you are dealing with sound, do it the analog way. That means OP amps and window comparators. The sound would have to be rectified at some point to get the envelope. First you have the input OP amp with a suitable gain configuration.
Then you feed the sound into some (4 plus) filters. These can, should be be switched capacitor filters of a higher order.... at least 4th order filters. You can also use the common telephone dial tone encoder chips and the decoder chips. The easy thing with switched capacitor filters is that they can be controlled by a x10 or x100 TTL control frequency (squ.wave) across the whole audio band.
You then rectify the sine waves or sound from the filter blocks to get the envelope. Then you have a DC voltage output. IT has to be full-wave rectification with smoothing capacitors!
That DC voltage is then fed into window comparators with adjustable upper and/or lower limits.
Once a sound frequency hits the mike - preferable of a steady amplitude, - it goes into the bandpass filters. Then comes the rectification to get the DC voltage. The DC voltage is then fed into the window comparators.
The window comparators switch on only when the voltage is within the chosen window - giving out a square wave pulse of the duration , pulse width you want.
That pulse can then be used to gate (like logic controlled CMOS gates like CD4066 which are multiple gates in one chip) a steady amplitude sine wave to your AM or FM transmitter. That is the transmitting part.
As for the receiving circuit, you need a stable receiver. It is basically the same as the transmitting circuit.. Small relays or Mosfets can be used to control the servos in the model car. The circuetry should be so designed that only two channels are used at any one time. That means logic gates... AND, NAND and OR gates. It means that you Can NOT at the same time have the Left steering AND the right steering on. you may want Left steering and forward on only as an example. There must be no glitches in the design - that means break before make in regards to switching modes.
Look - you can get away a lot cheaper by going to a hobby shop and buy the stuff in a nice little box with joystick control.... together with the receiver box. However, if you prefer the thrill of building all yourself - go for it. I have done that for years. When/if you decide to build it yourself, you need test equipment like a generator, multi trace oscilloscope, power supplies, a breadboard etc.
I wish you all the best my friend 
A lifelong tinkerer.....
EDIT: I forgot to mention that...... as there are V/Frequency converter chips - there are also F/V - (Frequency to Voltage) Converter chips out there which convert F to a DC voltage. That would simplify the design. National Semiconductors has them and others too. However, those chips accept TTL signals only as far as I know. It is therefore necessary to square the sine waves first and limit their amplitude to 5V or whatever the specs call for.
Electro Harmonix Memory Toy Analog Delay Pedal Demo