I'm working in a small space and trying to pulse a micro vibration unit kind of like a hea

 

A heartbeat. Thanks for all your help

 

If your heartbeat is vibrating, you should get to an emergency room quick.

 

Define "small space".

Define "micro vibration unit".

Define "why".

And, I second if your heartbeat is vibrating, you should get help.

 

Vibration motor?

 

Define "small space".

Define "micro vibration unit".

Define "why".

And, I second if your heartbeat is vibrating, you should get help.

1x1x2 there are batteries, charger ,rf switch, vibration unit and voltage booster . Cell phone vibration unit 3v

 

1x1x2 there are batteries, charger ,rf switch, vibration unit and voltage booster . Cell phone vibration unit 3v

1x1x3 cm, inches, furlongs...

 

there are batteries

What voltage?

 

Do you want the full double-pulse cadence of a human heartbeat?

ak

 

No just to pulse

 

So a single short pulse at about the same rate as a human heartbeat?
Does it need to be adjustable?

ak

 

So a single short pulse at about the same rate as a human heartbeat?
Does it need to be adjustable?

ak

No

 

A CMOS Schmitt trigger hex inverter (40106) can be used to form two monostables in a ring. One is the delay between pulses, and one is the pulse on time that drives a small transistor tnat drives the motor.

Or, a single hex inverter stage can do it with an extra diode and resistor.

You still have not said what the battery voltage range is, so a CMOS 555 might not work.

ak

 

A CMOS Schmitt trigger hex inverter (40106) can be used to form two monostables in a ring. One is the delay between pulses, and one is the pulse on time that drives a small transistor tnat drives the motor.

Or, a single hex inverter stage can do it with an extra diode and resistor.

You still have not said what the battery voltage range is, so a CMOS 555 might not work.

ak

I have a 3.7v boosted to 5v

 

1x1x2 there are batteries, charger ,rf switch, vibration unit and voltage booster . Cell phone vibration unit 3v

Is this some kind of random word association test?

 

I would use 3.7 V for vibrator & 5 V for 7555, 8 DIP or SM. Use pots for selecting times then sub. with fixed values. Do you know current draw of vibrator ?

 

I would use 3.7 V for vibrator & 5 V for 7555, 8 DIP or SM. Use pots for selecting times then sub. with fixed values. Do you know current draw of vibrator ?

I believe it is 3v

 

Current drawn when operating, not the voltage rating...

If you have 5 V for the logic, then you can use a 74AC14. Great part, love the AC (advanced CMOS, not alternating current) output stage. One section as the asymmetrical square wave oscillator (or two if you want more adjustability), and all remaining sections in parallel to drive the vibrator. A CMOS LMC7555 will do the same thing, but where's the fun in that?

ak

 

I believe the output of 74AC XXX is about 3 mA @ Vdd 5 V.
My little vibrating motor draws about 100 mA.

 

20 mA source or sink. HC is 3-4 mA.

ak