filter and amplifier

Hello, I'm beginer in amplifier circuit and filter circut. I'm working on a project that detects small vibrations from larvae inside tree trunk, I am inspired by this research ( Sensors | Free Full-Text | In-Vivo Vibroacoustic Surveillance of Trees in the Context of the IoT (mdpi.com) ). The...

I am confused. In a pulse sensor which I am developing for small animals, where pulse signal can range between 5Hz and 8Hz, I am using an HPF of 5Hz and a LPF of 8Hz. The real signal is somewhere close to 5Hz so I thought maybe 5Hz was way too close a cutoff, and so I proceeded picking Bard's...

So this below pulse sensor circuit works just fine, but I need to experiment whether the HPF is really necessary as I have tested it with very low HPF values like 0.5Hz and still can see my pulse. Every time I try to remove the HPF by feeding the signal straight to Active LPF stage, my signal...

Hello. I am trying to prepare a filter and amplifier circuit for a strain gauge (Wheatstone bridge in half-bridge configuration). Input power to the Wheatstone bridge is 1 VDC, and each output (+ve and -ve) of the Wheatstone bridge circuit goes the filter. The filter is a second order active...