Homemade Digital Oscilloscope

ATMega162 based homemade digital oscilloscope project with a sampling rate of 40MSPS and 5MHz maximum input frequency.

An oscilloscope is one of the most important tools that should take place on a electronics hobbyist’s workbench. But most of the commercial oscilloscopes are often too expensive. This LCD screen homemade scope features;

• 40 Mega samples per second
• 5 MHz input frequency
• 10 MHz max. frequency displayed without aliasing
• 20 MHz input circuit bandwidth
• 40mV/div sensitivity
• DC coupling
• 10 KOhm input impedance
• 240×128 total, 200×125 trace resolution
• 9V – 1A power source
• Digitally adjustable trigger and trace offset.

Main part of the circuit is Atmel ATMega162 microcontroller. OPA2652 and RF filter pair sets the BW to 20MHZ. 8 bit 60MSPS ADS830 IC is used for the analog to digital conversion. The digital output is connected to a high speed FIFO memory.