The following describes the design, construction, operation and use of the DECL (Decade PLL) module. The module has both a Phase Locked Loop (PLL) frequency multiplier and a frequency divider to produce various output frequencies that are based on an input reference frequency. The primary use of the module is to condition the ten megahertz (10 MHz
Click here to download the full size of the above Circuit.
) signal from a reference oscillator and produce divided and multiplied outputs synchronized to the reference. The DECL module uses two chips, a PLL chip and a microprocessor chip, to convert the rubidium input signal to a logic level and multiply and divide that signal to provide multiple frequency outputs that are related to the reference. The PLL chip conditions the input signal to provide a buffered, logic-level output. This output also drives the microprocessor clock input. The PLL provides a multiplied output, typically 25 MHz, for use as a stable phase-locked output that is derived from the input reference frequency. The microprocessor takes the buffered output of the reference signal and divides it to produce marker signals at various frequencies from 1 MHz to 1 Hertz. The microprocessor and its code are the same as used for the DECUS decade divider module. The schematic shows the components, circuitry and some operational information for the module. For example, the schematic includes a table for PLL jumper options and bottom-side component placement for the DECL PC Board. The Parts List provides additional information about the components used to assemble the module. Photo 1, the module measures approximately 1 1/4 by 7/8 inches (32 by 23 mm). This is the same size as the the DECUS module. Signal connections are provided on two 12-pin single-row pin headers. The header connections are labeled "A" to "X" for easy...
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: