Sensitive Fingertips

Step 8 Pullup and low-pass filter circuit

Cut a piece of perfboard 8 x 9 holes big. Copper lines running the shorter distance. Solder one 4.7uF capacitor (low-pass filter) and one 50K ohm resistor (pull-up resistor) between each input and the +.

Please take a close look at the photos and illustrated diagram to see how things are connected.

Comments

[Gundanium]

Where did you get the 50k Ohm resistors? They seem to be hard to come by.

[Plusea]

they were in the lab that i was working in at the time. i'm guessing they came from RS electronics (the european digikey equivalent).

[Gundanium]

It looks like those resistors in your photo are actually 56k instead of 50k if I'm reading the bands correctly. green = 5, blue = 6, orange = 1e3x => 56000 or 56k ohm.

How accurate do those resistors need to be?