Circuit consists of an oscillator with variable frequency, a divided frequency and measurement stage. The Oscillator is based on a inversor from a 74HC14 and generates a frequency f inversely proportional to the Cx placed between terminals. During a half periods of each signal his exit from IC3, C2 is loading by T1. During the other half of the pe
Click here to download the full size of the above Circuit.
riod, T2 is brought Conducted by the signal, so that C2 will be shortcircuited. In this way, the maximum voltage C2 depends on the frequency signal. Tension is taken over by repeter IC1b and integrated R1-C1. El medidor de condensadores que aquG se presenta puede medir capacidades entre 100pF y 1uF y en cinco rangos de mediciG³n, mG s de lo que puede decir un multGmetro o tester. El circuito consta de un oscilador de frecuencia variable, un divisor de frecuencia y una etapa de mediciG³n. El oscilador se basa en una puerta inversora (IC2a) de un 74HC14 y genera una frecuencia f inversamente proporcional a la capacidad del condensador Cx colocado entre sus terminales. Cx es el condensador cuya capacidad se desea medir. donde R es la resistencia seleccionada por S1b. Con los valores mostrados en el esquema, la frecuencia se sitG a entre 240 Hz (Cx = 1uF) y 12 kHz (Cx = 100pF). La frecuencia es aplicada a la entrada del divisor Ic3b. Durante la mitad de cada periodo de la seG±al en la salida de IC3b, C2 se carga mediante T1, estando T2 en estado de no conducciG³n (abierto). Durante la otra mitad del cada perGodo, T2 entra en conducciG³n polarizado por la tensiG³n de la salida de IC3b, poniendo en cortocircuito a C2. De esta manera, la mG xima tensiG³n de carga de C2 dependerG de la frecuencia de dicha seG±al. La tensiG³n es tomada por la puerta IC1B, que actG a como repetidora, y es integrada por R1-C1, entregando sobre el...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: