Circuit schematic diagram IC1-4069 the Y1, Y2 to form a frequency 76KHZ oscillator, Y3-Y6 isolation after shaping into the IC2 CD4027 dual JK flip-flop consisting of two compon
Click here to download the full size of the above Circuit.
ent frequency circuit that generates a symmetric +/- 38KHZ and 19KHZ square wave, square wave +/- 38KHZ which is used to control the analog switch IC3 CD4066, after stereo input audio signal switching with a frequency-modulated signal 19KHZ and then mixed into isolation after the transistor 9014 FM modulator. FM modulator circuit can be found in the site in a variety of FM transmitter circuits. This article is not shown, the purpose is to let the fans can easily use this encoder, not only can increase the functionality of your old stereo FM transmitter, but also as a general-purpose equipment. Debugging is connected as the FM modulator and a five-volt power supply, measured with a multimeter IC1CD4069 each foot and IC2 CP, Q, Q, each foot should be half the supply voltage has been described oscillator start-up. If a digital frequency meter, measuring IC1 output frequency, the frequency is adjusted RW1 75KHZ +/- 10HZ can. If not, can be aligned radio, RW2 half after a good tune, and then transferred RW1, make radio stereo indicator light, and the speaker is no temple frequency howling. And then into the stereo audio signal (1.5Vpp, available power amplifier output) from the input terminal at this time you will be able to receive stereo broadcasts on the radio. The input signal can also be obtained from the line, but this time R7 should be changed accordingly. Finally, you can also adjust the high-frequency noise R7 minimum, in fact, R6, R7 is equivalent to BA1404 of 13-14 feet in external components, is a pilot signal and a composite signal mixing circuit and input to the amplifier, this circuit is 9014, and BA1404 in from 12 feet on entering, I think this circuit there are many places for improvement, development of what it might be interested in.
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: