DIY Mini-Oscilloscope

Build this small oscilloscope. Up to 40KHz (25us) in 4 ranges, auto trigger/free sweep, 50mV - 50V input in 2 ranges, AC/DC input.

IntermediateFull instructions provided6 hours3,268

Things used in this project

Hardware components

CD4017B

decade counter

CD4049UB

hex inverter

LM324N

quad op-amp

LM3914

10 output bar/dot display driver

DA-3570E

common anode /X5 led matrix

Story

Video

Build this small oscilloscope. Frequency range is up to 40KHz(25uS full screen) In 4 selectable ranges. Input voltage is between 50mVpp and 50Vpp in 2 selectable ranges. Gain is adjustable between 1 and 100. Accepts AC or DC input. Auto-trigger sweepfunction to "freeze" the wave display. Free sweep is obtained by setting the potentiometer at either extreme setting. Y-axis adjustment to center the wave. Runs from a 9V battery.

Schematic:

Main Blocks (5 images):

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Controls (4 images):

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Circuit Operation Details (13 images):

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Charts (5 images):

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Label the sweep time potentiometer from 0 to 10, and use these charts to read the sweep time ( or frequency ) in the 4 ranges. Do the same for the gain potentiometer.

Pinouts (5 images):

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Parts List (2 images):

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Auto-Trigger Out of Range (2 Images):

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Video:

Views:

1 / 2 • square wave / sine wave

Credits

SimpleTronic

15 projects • 38 followers

Electronics hobbyist (>55yrs) - Music arranger / composer (>45yrs) - Recording engineer (>25yrs)

DIY Mini-Oscilloscope