The Piezo speaker,
We (and a customer) built a Morse Phone that was proven detectable using The LED, but didn't make a beep. This information is also included in the building description.
In this case, the Piezo speaker will not work. During transport in the package, the legs are sometimes pressed and / or twisted.
As a result, the legs do not make good contact internally or cause a short circuit
This is easily resolved by loosening and removing the bottom of the speaker.
Then it's about bending the legs into the model and closing the bottom and carefully soldering the speaker into the PCB. Please note that when you put it back, the legs will not be pressed again.
(Short on feet measure ~ ~ 0 Ohm, Open and good functioning specimen both measure infinite high resistance)
Coil
A coil was found that was interrupted. Resistance should be between 20 and 50 ohms for the good coil and the wrong copy measures infinity. Again we can carefully look at the pins for a loose leg, but one of the 2 coils can be bridged to solve the problem and keep the Morse Phone working properly.
By knowing this, you can ensure that all scouts end up with a working copy of the Morse Phone
Tip for construction
If you have removed parts of the Morse Phone print, a strip remains. It contains 2 slots with a distance of 8mm.
You can use this to make the contacts for the morse key