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Topic: Oscilloscope or logic analyzer  (Read 2771 times) previous topic - next topic


If you're into circuit bending (audio) - then a scope is likely to be a better thing to get than a logic analyzer - and you really don't need anything fancy. Any of the low-cost 2 channel digital o-scopes will serve you just fine, because you are dealing with audio frequencies mainly, and you only need something with 2-4 times the bandwidth of the fastest signals you are dealing with (in this case, audio - so 20 KHz or so - thus any scope with over 80 KHz bandwidth will work just fine - even one from the 1960s).

Another item you might look into is a signal generator - something that can output sine waves and square waves minimum, in the audio frequency range. There are plenty of low-cost possibilities out there (from small and cheap open-frame boards from Chinese suppliers, to homebrew 555 contraptions, to well made - but still low cost - lab bench style). Another thing that will be useful is a dual-output, fully adjustable power supply (something around 0-15 volts or so, 2-5 amps). This won't be really cheap - but it will be well worth it. You want it adjustable so that if you are unsure about current or voltage needs, you can dial in something low, and if too much is drawn, it will kick off quickly - maybe enough to save the circuit (not always, though - but faster than a fuse).

If you need to probe digital stuff, then a logic probe is likely all you'll want or need for most things you'll come across in bending. A homebrew one can be instructional, but commercial ones are readily available at a fairly low cost. Some digital multimeters even have the capability to act as such a probe (and can even tell you the frequency a signal is pulsing at, if that matters).
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