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### Topic: Pulse meter schematic (Read 1 time)previous topic - next topic

#### cracklings1017

##### May 15, 2012, 06:48 am
Hello guys!

Can someone figure this out: http://code.google.com/p/pulsometer/

I am having doubts on the 0.1F below the 487k resistor on the schematic.

Is that electrolytic or a ceramic? or is it 0.1uF?
just to big value for a pulse monitor. The maker is not replying for my comments, need some help guys.
I'm really a noob in electronics. =(

Arduino Projects Problem!?

#### Nick Gammon

#1
##### May 15, 2012, 07:08 am

Please post technical questions on the forum, not by personal message. Thanks!

http://www.gammon.com.au/electronics

#### cracklings1017

#2
##### May 15, 2012, 07:13 am

ok sir Gammon and sorry.
Arduino Projects Problem!?

#### michael_x

#3
##### May 15, 2012, 01:58 pm
It's rather 0.1 µF = 100 nF.

R*C of R1*C1 should be in the same range as R3*C2 ( giving you a gain of about 10 ).

And I bet R1 = 470k (if you have it available anyway) would work the same as the proposed 487k

#### cracklings1017

#4
##### May 15, 2012, 04:01 pm

It's rather 0.1 µF = 100 nF.

R*C of R1*C1 should be in the same range as R3*C2 ( giving you a gain of about 10 ).

And I bet R1 = 470k (if you have it available anyway) would work the same as the proposed 487k

Thanks sir...
Arduino Projects Problem!?

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