Eight-channel Scope Input

Two channels are usually sufficient to perform the majority of circuit measurements carried out at the test bench but sometimes it would be useful to be able to see what is going on in more than two places simultaneously. The price of multichannel oscilloscopes however dictates that these are for professional users only. The circuit described here shows that with a little ingenuity it is perfectly possible to expand the numbers of input channels to eight. The circuit has been designed with simplicity in mind and can only be used for viewing digital waveforms.