Intro to Logic Analyzers

If the simple DIY generator is not to your liking you might want to consider something  Function/Arbitrary Waveform Generator supplied in this case .

I won’t bore you with spec you can read online but the basic spec includes up to 20Mhz signal out, 14 bit precision, more stored waveforms than you can shake a stick at with the ability to store up to 20 arbitrary waveforms (hence the term Arbitrary Waveform Generator), two independent outputs, lightweight, decent display, external PC control, TTL output and a whole lot more. The 20MHz Function Generator gives you a good look around this device.