Oscilloscope and Multimeter Schematics

Electronics Infoline Web

Digital PC Oscilloscope

http://www.ee.washington.edu/conselec/CE/sp95reports/guterman/final/scope1.htm

This circuit is a buffer between oscilloscope probes and sound card. It provides amplification and protection against high voltage input signals.

http://xoscope.sourceforge.net/hardware/hardware.html

http://www.qsl.net/g3pto/mmeter.html

This circuit conditions different signals of frequency below 1 kHz and displays their waveforms on the PC screen.

http://www.electronicsforu.com/efylinux/circuit/dec2002/circuit1_oscilloscope.pdf