Hello there, I am Colin. I took mechanical engineering technology in school.

Here are the schematics for my product:

a) Fixed 60Hz AC input
b) Rectifier
c) Inverter (pulse width modulation)
d) Variable frequency drive with AC output
e) Controls the speed of an AC electric motor
f) the material for to stick it to the pillow and such

I want to source the right and cheap products on Alibaba.

Please guide me as I do not know what I am doing.

Thanks, Colin

 

Welcome to AAC!

Can you provide more details of the electric motor, a link perhaps?

 

Welcome to AAC!

Can you provide more details of the electric motor, a link perhaps?

Thanks Mr chips!

This is my first electrical project. I know next to nothing about which electric motor to buy, just like the rest of the parts unfortunately.

 

In order to drive the motor you need to select the right motor.
What does the motor have to do with the pillow? Please elaborate.

 

In order to drive the motor you need to select the right motor.
What does the motor have to do with the pillow? Please elaborate.

The idea is to make the pillow vibrate.

 

The idea is to make the pillow vibrate.

You cannot make the pillow vibrate.
You can insert something inside the pillow that vibrates.
What is the purpose of a vibrating pillow?

 

If you are running this for human 'consumption' of mains AC, then you require the necessary safety precautions.
A vibrator often just uses some kind of arrangement using AC solenoid coils where the armature just vibrates at that frequency.
Intensity can Triac controlled, if necessary.
.

 

I was going to suggest taking a visit to an adult store and have a look at what is available in battery powered vibrators.

 

MrChips: I picked a specific frequency for pain relier, at 174 Hz. I do need to have a vibrator at 174Hz to make the pillow vibrate at that frequency. Also I was actually looking at taking apart a dildo haha. I have a vibrating seat for the old car, but I do not know how to change its' frequency, which I think would be very difficult for an electrical amateur.

Thanks for getting back to me MrChips and Max!

 

We don't know the mechanical power requirements.
A cell phone vibrator motor might be just the thing you need.

 

I picked a specific frequency for pain relier, at 174 Hz.

That's within the range of speaking voice for humans. Just shout into your pillow.

But, in all seriousness, an oscillator, audio amplifier, and speaker would produce 175 Hz vibrations very effectively.

 

For 174hz I would use a audio push-pull transformer and a solenoid output in place of a spkr.
Tune the input for 174hz via a simple osc circuit.
I once saw something like this at a brewery that wanted the bottled beer to effervesce before capping. it had a solenoid-operated vibrator that shook the bottle just prior to capping

 

Thanks guys! I want to try the phone vibrator method first as it seems cheap and simple.
MrChips, please guide me on the phone vibrator how-to, like what parts to buy and how to connect and adjust them.

Thanks, Colin

 

Thanks guys! I want to try the phone vibrator method first as it seems cheap and simple.
MrChips, please guide me on the phone vibrator how-to, like what parts to buy and how to connect and adjust them.

Thanks, Colin

I bought cell phone vibrator motors from Princess Auto, a packet of 5 for very little cost.
They can run on a single AA 1.5 V battery. To adjust the speed, all you would need is a 1 W wire-wound variable resistor, say 10 to 25 Ω in series with the motor.

Here is an example of other sources:
https://www.pololu.com/category/331/vibration-motors

 

Thanks MrChips. How close can I get to 175Hz with this method? Is there something I can add to the circuit to get exactly 175hz?

 

My friend said I could use a variable resistor and use a chromatic tuner to find the right resistance. What do you think of this, MrChips?

 

My friend said I could use a variable resistor and use a chromatic tuner to find the right resistance. What do you think of this, MrChips?

Do you have an oscilloscope? You can use a microphone or piezo-electric transducer to pick up a signal and measure the frequency on an oscilloscope.

Without an oscilloscope, use your smart phone or a microphone plugged into a computer. There are free apps for computers and smart phones that will measure the frequency of signals from a microphone. You can even display the audio frequency spectrum in real time.

 

Do you have an oscilloscope? You can use a microphone or piezo-electric transducer to pick up a signal and measure the frequency on an oscilloscope.

Without an oscilloscope, use your smart phone or a microphone plugged into a computer. There are free apps for computers and smart phones that will measure the frequency of signals from a microphone. You can even display the audio frequency spectrum in real time.

I do not have an oscilloscope, but I could buy one. So, do you recommend me to use the variable resistor?

 

If you are not getting in to anything very Hi Freq, You could consider the neat & cheap - compact FNIRSI

 

If you are not getting in to anything very Hi Freq, You could consider the neat & cheap - compact FNIRSI

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Do you know if this would work for a frequency of 175hz? I don't want to buy it and crap out at 50hz sort of thing.