No. The diaphragm can’t be removed. The diaphragm, together with the chamber, amplifies the sounds. If you remove it, you may hear very low volume or even no body sounds.
Generally, the bell mode is good for listening to heartbeats which are mainly made of very low frequency sounds. The diaphram mode is good for listening to breath sounds because the heartbeats sounds are weaken in this mode.
When your Stemoscope is working, use your finger to tap/knock the diaphragm. If you can hear a loud dub sound with your earphones and high volume when you tap/knock, the Stemoscope works well. Heart sounds are easy to be detected. You may listen to your heartbeats. If you can hear your heartbeats clearly, your Stemoscope works well. Please don’t forget to wear your earphones and increase your phone volume if necessary.
Since most sounds sensed by Stemoscope have a very low frequency, earphones favoring bass sounds (low frequency sounds or low pitch sounds) are prefered. Most headphones that generally cover the ears perform very well. While for earphones, the original earphones coming with the iPhones or Samsung phones also perform well.
When you hold the Stemoscope on an object you want to listen, there can be multiple sources of noise. One source is from the non-stable hand. You may try to hold the Stemoscope as stable as possible and avoid friction between the Stemoscope and the object surface. Another option is to use a strap accessary, which can totally remove such friction induced noise.
You can open the Stemoscope App and tap “settings” on the home screen. In settings, tap “Device management”. You can find “Add a new stemoscope”, and then you can add a new Stemoscope the same as the first one you added.
You can use your registered email address to retrieve the QR codes of all the Stemocopes you have registered. Please use this email address to send an email to firstname.lastname@example.org, and tell us that your QR code is broken. We will email the QR code to your email address.
A stable Bluetooth working distance depends on a lot of factors such as the environment and your phone. In a “busy” wireless environment where there are many phones and WIFI devices, the Bluetooth connection could be interfered. Our recommended working distance is 2 meter, within which Stemoscope normally works well based on our test. For the best Bluetooth performance, you may minimize the distance between your phone and Stemoscope and minimize the obstacles between them.
The loudness or the volume is determined by several factors. Firstly, the source of the sounds can be weak, depending on what you are listening to. Secondly, different phones have different audio output power level. For example, an iPod touch outputs higher power level than an iPhone. Thirdly, the performance of earphones varies quite a lot. You may try a headphone for better performance.
Human ears have different sensitity to different audio frequency. This is generally described by a hearing curve. In generally, human ears are less sensitive to very low frequency (pitch) sounds. With the same power level (Phone volume level), we feel the low frequency sounds are less loud. We may increase the phone volume to feel the low frequency sounds are loud enough and when we do not use Stemoscope adjust the phone volume to the orignal level.
Human body sounds are most times full of bass (low pitch or low frequency) elements. The builtin speaker in a phone is generally not good at playing these bass sounds. Earphones performs much better than builtin speakers.
Firstly, you need to give the Stemoscope App access to your phone camemra to read the QR code. Seconly, you may try different light environment and shoot angles. Thirdly, you may screw down the diaphram cover and put the diaphram on a white background such as a white paper to shoot the QR code.