If you are new to electronics and would like to try adapting published projects, or designing and building your own circuits, you need to have a small stock of components available.

If the waveform on the scope droops then you may need to use a 10X attenuating probe or mode. this attenuator is at the tip of the probe hence better measurement possible, also very high frequency signals may be best transmitted over a 50 ohm impedance matched line to the Oscilloscope.