What are the most common testing signals?

[MilanAudio]

Hello to everybody,

I would like to generate a sounds collection for people without oscilloscope. What are the most common and helpful testing signals?

I know that the ‘shapes’ are sine, triangle/saw-tooth, square and perhaps inverse line.

But what frequencies? 10hz, 1 kHz, 10kHz and 20kHz?

It should be mono only, or stereo?

Best wishes,

Milan

 

[JonSnell Electronic]

A little pointless with no oscilloscope.
Both 10hz ans 20khz cannot be heard!
440hz is middle C on a piano and can be useful for wow and flutter in tape machines.
Philips test tapes have a 3.15khz sine wave for speed checking.

 

[TungstenAudio]

There is an app for that. Several apps for the iPhone and iPad have good signal generators.
The only kind of signal that will be useful without an oscilloscope is a sine wave. Sine wave amplitudes can be measured with a simple multi-meter to check signal path integrity and amount of gain.

 

[rayma]

Scopes can be very cheap, even free on your phone. However, your phone may not be as good as the DUT.
Oscilloscope - Apps on Google Play
Fully Assembled #NA DSO138 2.4" TFT Digital Oscilloscope (1Msps) with FREE Probe | eBay

 

[carlthess40]

If someone needs a scope I have one for sale
It’s a two Channel 50mghz