This ultra-simple radio, for the medium wave range, does not need batteries or any other power source. The energy comes from the very radio waves that are picked up. An excellent project for STEMers.
The detection of radio signals using a simple diode or the PN junction of a transistor, nowadays is absolutely normal, when we think of the assembly of an elementary or even a little more complex radio. However, before there were semiconductor diodes and transistors the thing was not so simple. Very interesting solutions for the detectors were created and discussed in the book Early Radio Wave Detectors of Vivian J. Philips in association with The Science Museum of London in 1980. See in this article some of the solutions adopted at the time.
What have the electronics and technologies got to do with religion? When Professor Ventura makes something up everything is possible, and what happened this time is no exception. The "craziness" of the Teacher, when they don’t work out, can have strange effects including some easily related to supernatural entities and paranormal phenomena. In this story "Contacting with the beyond" the reader will find out what happened this time and certainly laugh a lot.
We have already announced for some time a robot created by British researchers which detects slugs and captures them by placing the slugs in a container where they are "digested" to generate electricity. This electricity produced by a biocell is used to charge its battery. A slug eater.
THE WORK PLAN
The Adventures of Professor Ventura aim at teaching a bit of technology, basically electronic, computer and even other sciences (STEM) in a fun way. Around a story, the Professor uses technological and scientific resources to either solve the problems that occur in a small town where he lives or create (unintentionally) these problems, always helped by his students Bart and Bert.
Audio power amplifiers are the final step of a lot of electronic projects. The ability to rely on a module ready for use or experimentation is something that may be of interest to many readers, especially those who do development projects. The amplifier described has excellent power (8 Wrms or Wpmpo 30) with supply of 8 to 18 V and uses very few components. It is an ideal solution for development projects.
Light Receiver (CB850E)
This circuit is intended for the use as modulated light signals from digital sources. The circuit...
M204 Audio Preamplifier (CB849E)
This is a general purpose pramplifier launched in Brazil by Philips in the years 70. The BC549 is...
Low Impedance Preamplifier (CB848E)
This circuit can operate with 5 uV to 1 mV input signals from low impedance sources such as...
High Power LED Modulator (CB847E)
This circuit is suggested by Texas Instruments in his Optoelectronics Sourcebook. The transistors...
4093 Oscillator (MSB0125E)
This oscillator can run in frequencies up 10 MHz depending on the Power supply voltage. The 1 µF...
Decade Counter (MSB124E)
This one-digit counter is part f the samples bench of the MultiSIM in one of its versions. The...
Simple Timer Using the 555 (MSB123E)
This simple timer can be used in many applications such as egg timer. The LED glows up when S1 is...
Ultrasound Emitter (MSB122E)
The circuit shown by the figure below can produce signals in the range between 20 kHz and 30 kHz....