Abstract: A breadboard for building and displaying electronic circuits used for educational purposes comprises a panel housing, an assembly panel attached to and covering the panel housing, a plurality of contact stations located on and periodically distributed over the assembly panel such that they form a regular grid, which contact stations are electrically isolated from each other and capable of receiving electronic component blocks, a plurality of first power supply points located on and periodically distributed over the assembly panel such that they form a regular grid, which first power supply points are electrically connected to each other, and a plurality of second power supply points located on and periodically distributed over the assembly panel such that they form a regular grid, which second power supply points are electrically connected to each other and the second power supply points are electrically isolated from the first power supply points, wherein the grids formed by the contact stations, the first p

Abstract: The invention relates to an arrangement for measuring the speed of sound, the arrangement comprising: an electrical pulse generating means (402) for generating an output electrical pulse signal (404), a transmitting transducer (403) for converting said output electrical pulse signal (404) into an output acoustic pulse signal (405), a reflector (407) for reflecting said output acoustic pulse signal (405), thereby producing a reflected acoustic pulse signal (409), a receiving transducer (408) being arranged such as to receive said output acoustic pulse signal (405) transmitted directly from said transmitting transducer and said reflected acoustic pulse signal (409) reflected by said reflector, wherein said receiving transducer converts the received output acoustic pulse signal (405) into a reconstructed output electrical pulse signal (410) and the reflected acoustic pulse signal (409) into a reconstructed reflected electrical pulse signal (411), a speed determination means for determining the speed of sound (41

Abstract: A method is provided for analog/digital converting of at least one analog low-frequency signal with an analog/digital converter which can detect only an analog signal with a frequency above a predetermined border frequency value, wherein at least one analog low-frequency signal and at least one analog high-frequency signal are provided. An analog intermediate signal is generated from said analog low-frequency signal(s) and said analog high-frequency signal(s) and is input to the analog/digital converter. The analog intermediate signal is converted into a digital intermediate signal, and a digital low-frequency signal corresponding to said analog low-frequency signal is determined from the digital intermediate signal.