Circuit using an ordinary digital quartz electronic watch, the lower its crystal welding, as shown by the connected circuit constitutes a digital frequency meter. The test sign
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al is applied to E, F side by R6, D3, D4, etc. limiter, and adjust RP1, control the intensity of the input signal. When measuring, click K5, the IC2 monostable delay circuit is set, four analog switch IC3 (CD4066) of CK2, CK3 closed, CK1 off, form the core of memory circuit is cut off, the signal being measured by CK2, R5, C4 is added to form the core of the D point, form the core division, counting circuit starts operating. To be a preset time, IC2 of 3 feet referred to the low level, CK2, CK3 off, CK1 is closed, the signal to be measured into the memory state. When reading, just click K4, the liquid crystal display panel will show the frequency of the signal to be measured. The timing switch K6 is divided into two tranches of 33 seconds and 328 seconds. When debugging, adjust RP3 at the second speed, timing of 328 seconds; adjust RP2 at the first speed for 33 seconds. A positive figure point of access electronic watch, B point of access form the core of the upper end of the function keys, C point of access form the core negative reed, D point of access to any foot pads quartz crystal. The reading on the LCD screen when a file, the value is multiplied by the frequency 1000Hz, the value is multiplied by 2 files 100Hz.
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.....
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