Backyard Brains cocroach nerve signal amplifier

177

02:05:40

The aim of this circuit is to amplify the nerve signals from a leg of a cocroach to be audible when the output of this circuit is connected to a Radio Shack Mini Audio Amplifier

This circuit is discussed in https://backyardbrains.com/experiments/transistorDesign

Requirements:
- Gain >= 150
- high pass filter cut off frequency > 300Hz

There is two similar stages of common emitter amplifier, the second stage has an 50Ohm extra emitter resistor in series with the capacitor for stability.

Gain from simulation:
input: 0.006Vpp
output: 6.61Vpp
Max Gain: 6.61/0.006 = 1101 (with some distortion)

published 9 years ago

lmccoig

9 years ago

How do you connect to nerve signal in cockroach's leg?

nemethakos

9 years ago

They use two needles: https://backyardbrains.com/products/recordingelectrode

FarukAbi

9 years ago

I wanna try the circuit but cockroaches make me sick.

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