Oscilloscope recomendations wanted

[Liddlepud]

Can anyone recommend a cheap and easy to use oscilloscope for viewing voltages and waveforms etc.

Will I be able to use an oscilloscope to find out the frequency cut off of a filter? I've just got a doepfer A-127 Triple Voltage Controlled Resonant Filter and I'd like to try and use it for creating vowel sounds as per the settings in the Doepfer manual

[Electronic battle]

How much is cheap, in your view? I would buy a £30-59 scope off eBay and play with it rather than spend £100s, at least to start with. Something like this perhaps:

http://short.zen.co.uk/?id=e25 (ebay link)
or
http://short.zen.co.uk/?id=e26 - OK for maybe 10kHz audio at most

Yes, you will be able to see the cutoff frequency of a filter using a scope and a signal source. There are a variety of ways to do so - one is to measure the amplitude of the signal well below the cutoff frequency, then observe the amplitude which should stay constant as you change the cutoff frequency. As the cutoff approaches the signal source's frequency, you will be able to see the amplitude of the signal diminish. When the amplitude has dropped to about 70% of the original, unfiltered value, the frequency you are then at is the cutoff frequency.

note that the filter Q will affect the response of the filter such that you get a rapid *rise* in amplitude as you get towards cutoff ... and then it falls away as above.

[Liddlepud]

Thanks