There was no mistake that we couldn't perform analysis without the cooperation of the device vendor. Our sweat-drenched efforts to find the cause continued while involving the agency and engineers of the device vendor in the U.S. Since the vendor was well aware that the device was selected by us being a fan of the product, they were very open about cooperating with our needs. Although I never regretted the use of this device, I definitely had mixed feelings when seeing the development members battling the heat in front of the thermostatic chamber.

Sharing the same ideal design concept

Let me go back a little again and explain why I liked this device so much and decided to use it.

In reality, more voltage than necessary must be handled in order to reliably ring the bell of a telephone. The telephone was invented more than a century ago, and it can be said that the technical fundamentals of that time were carried forward without many changes. In order to ring the bell, more voltage than what seems rational at the present is needed.

No matter how appealing the value born from innovation may be, there is always this aspect in the real world, and thus continuous changes are needed to prevent problems during actual use. Although I believe that there will be a communication tool that exceeds conventional telephones by the widespread deployment of broadband, it is crucial for the new system to accommodate telephones that are being used today. And a large voltage is not necessary in the case of just sounding an incoming call tone as voltage from a dry-cell battery is sufficient. However, several ten times the voltage of a dry-cell battery is needed to ring the bell of a conventional telephone. Since more voltage than necessary was applied, it was converted into excessive heat. It is critical that this energy be used to realize only the intended functions without producing heat.

This device was built with a revolutionary function of keeping to minimum the conversion to unnecessary heat. In order to suppress heat, it is critical to create only the voltage and current necessary for operating the needed function. Although this is not easy, I shared the same ideal design concept. However, the downside-and the only downside-was that impedance was susceptible to large noise.