This relay closes its contacts only when signals from a narrow range of frequencies around the selected value are applied to the input. We can use this circuit in remote controls modulated by tone, selective activation with single cable of control and in fines other applications that involve from the recreation to the professional use.
This is a circuit of unprecedented light effects - a lamp suddenly lights up with maximum brightness and then fades slowly out. After a few seconds it goes back on, repeating the cycle. The system supports lamps up to 1600 W in the 220 V network (half on the 110 V network) and can be used at home, as a window decoration or in an interesting and mysterious lamp.
Most amplifier designs or even types obtained in kits do not include an appropriate tone control. When many have a passive tone control that first attenuates certain frequencies than reinforces them; acting in an inverse way to the desired one. The simple tone control that we describe can be the ideal solution for the project of the reader that needs this feature, but without loss and with good audio quality.
One of the most important phenomena we observe in magnetic materials is hysteresis. Knowing exactly what it means is essential for everyone working with inductors and transformers, especially in modern circuits such as switched-mode power supplies, frequency inverters and AC / DC converters. In this article, we review the basic concepts of magnetism and explain what hysteresis is.
Experiments in biology, physics and chemistry can become much more useful and interesting if they involve temperature measurement by using a sensitive electronic thermometer. Of great readiness, this thermometer detects electronically minimum variations of temperature.
A special National Semiconductor Integrated Circuit enables the activation of LEDs with 1.5 V voltages opening up to a huge range of interesting assemblies. See in this article the basic design of a flasher with this component.
We find this circuit in a Radio Electronics of July 1984. It consists of the traditional version of 1 A...
The purpose of this circuit is to regulate the output voltage of a source at 11.4 V or other...
This adjustable source was found in a 1979 documentation, but all components are still common...
We found this circuit in a 1987 Hands On Electronics. It was indicated at the time to power...
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...