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heartbeat calibrator/simulator

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Dino1400

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hi, I trying to come up with a circuit that will desplay a a shape like heart beat at the output, with some frequency around 50Hz and voltage of about 2mV. the idea i have so far is using a Timer (555) to generate some pulses but i had a problem of changing the amplitude of some of those pulses. I wast a lot of time, yet i'm not even close please if you have any idea that my help i love to try it thank you.
 

yes its a school project i tried almost everything and im about as everybody, so please if you have idea i will try tooo

---------- Post added at 22:26 ---------- Previous post was at 22:25 ----------

by the way i need a PSPICE model for Crystal oscillator circuit or CD4017B, something i think my help
 

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