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BioAmp v1.5#

Small-size portable biopotential amplifier with a no code setup for non-invasive EMG recording!

Overview#

It is a small size portable biopotential amplifier with a no code setup to record and listen to your muscle signals (EMG) non invasively. The best part is that it doesn’t require any microcontroller (like Arduino) to sample the signal. You just plug a 9V battery into the board, electrodes to the body, and an audio jack to a mobile/laptop, and you are ready to record signals from muscles (EMG) using audacity or Backyard Brain’s spike recorder app.

../../../_images/bioamp-v1.5.png

Features & Specifications#

Minimum Input Voltage

7-9 V

Input Impedance

10^7 ohm

Fixed Gain

~200x

BioPotentials

EMG (Electromyography)

No. of channels

1

Electrodes

3 (Positive, Negative, and Reference)

Dimensions

5.0 x 3.0 cm

Open Source

Hardware + Software

Hardware#

Images below shows a quick overview of the hardware design.

PCB Front

../../../_images/front-pcb.png

PCB Back

../../../_images/back-pcb.png
../../../_images/front-assembled-with-wires-1.png

Assemblying the kit#

You can get your own Bioamp v1.5 bag of parts from our store or Tindie or the step by step guide below.

../../../_images/1.png

Step 1 - Bare Board#

../../../_images/2-100K-resistor.png

Step 2 - 100K Resistors#

../../../_images/3-2.2K-resistor.png

Step 3 - 2.2K Resistor#

../../../_images/4-1K-resistor.png

Step 4 - 1K Resistors#

../../../_images/5-220K-resistor.png

Step 5 - 220K Resistors#

../../../_images/6-10K-resistor.png

Step 6 - 10K Resistors#

../../../_images/7-100nF-capacitor.png

Step 7 - 100nF Capacitors#

../../../_images/8-1nF-capacitor.png

Step 8 - 1nF Capacitors#

../../../_images/9-connectors.png

Step 9 - JST PH Connectors#

../../../_images/10-socket.png

Step 10 - IC Socket#

../../../_images/11-IC.png

Step 11 - IC#

../../../_images/12-LED.png

Step 12 - Power LED#

../../../_images/13-47uF-capacitor.png

Step 13 - 47uF Capacitors#

../../../_images/14-switch.png

Step 14 - Switch#

../../../_images/15-headphone-jack.png

Step 15 - Headphone jack#

Connections#

To measure the EMG signals, just connect BioAmp Cable v3 with the hardware as shown in the image below, and get started.

../../../_images/connections.png

Using the Sensor#

Some project ideas#