This is another article that we provide on our site which deals with the operation of Triode for Alternating Current, TRIAC. Other articles can be found with slightly different approaches. The difference is the time they were written and also in the type of audience to be reached.
Piezoelectric transducers used in buzzer or even tweeters can function as excellent high impedance microphones. In this article we show how to mount a small FM transmitter using one of these buzzers as a microphone. The circuit has a range of 50 to 200 meters.
This article describes both a project and a very interesting remote listening experience. With the aid of an amplifier and a headset, we describe how to transmit sounds through walls. These sounds can either be a recording of a CD or the sounds picked up by a hidden microphone.
An option for those who do not have an electret microphone of the type that is used in most small transmitter designs is to use another type of microphone that can even be obtained from scrap material. In order to help such readers and even provide some savings in assembly, we have described an FM transmitter that, instead of using the common electret microphone, employs a small speaker or even a low-impedance headset in its place.
A very interesting assembly based on a high voltage circuit is the Jacob's Ladder. This is a circuit that generates rising or alternating rays by jumping between parallel wires giving the impression that they form a fire or electric ladder. It is a device of great visual (and also sonorous) effect when presented at fairs. The Jacob Ladder project we present uses few components, among them the little-known SIDAC.
What unexplained forms of energy emanated from the monks in meditation capable of melting in the heights of Tibet the snow on their back? What strange forms of energy emanated from people endowed with paranormal powers, who are able to move objects or twist spoons and forks without touching them? If you are interested in transcendental studies, parapsychology, or exology research, you certainly have a reason to believe in this form of energy which emanates from all of us, but which appears in greater numbers in certain people. How to detect this "psychokinetic" energy and to make interesting experiences revealing an eventual paranormality of yours or your friends, or simply arouse your curiosity at a meeting of friends, is what we will see in this article.
To operate with high input voltages using a 3-terminal voltage regulator such as the LM340-15, we...
We find this circuit in an old technical documentation. The circuit can be drawn up with other...
This circuit was obtained in a 1977 technical documentation. The sensor is a thermistor from 10k...
This circuit converts voltages from 5 to 12 V at voltages of 100 to 400 V. The transformer has a...
The power source shown for powering for small TTL circuits was found on a Radio Electronics...
IGBTs are widely used in frequency inverters, power controllers, switched sources and DC/DC...
This oscillator can run in frequencies up 10 MHz depending on the Power supply voltage. The 1 µF...
This one-digit counter is part f the samples bench of the MultiSIM in one of its versions. The...