The oscillator with electronic tuning of frequency

Posted on Feb 7, 2014

A schematic diagram of the oscillator is shown in Fig. 1. The common-base transistor stage (Q1) provides amplification of the signal in the positive feedback loop. The signal of the positive feedback develops across the resistor R1, this resistor is common to both the emitters of transistors Q1, Q2. The transistor Q2 configured as common collector

The oscillator with electronic tuning of frequency

Click here to download the full size of the above Circuit.

circuit. The frequency of oscillation is determined by the input and output conductance of transistors and the inductance of the coil L1. Both the frequency and amplitude of the oscillation depends on the value of the resistor R1. The frequency of oscillation changes in a wide range due to changes in the conductivity of the transistors when the supply voltage changes. With the values of components, shown in fig. 1, the frequency of oscillator decreases from 700 kHz at Vcc = 3 V to 420 kHz at Vcc = 9 V (Fig. 2). To connect a low resistance load to the output of the oscillator it takes to use an emitter follower. . model KT503d NPN(Is=6. 843f Xti=3 Eg=1. 11 Vaf=129 Bf=106. 6 Ise=66. 48f Ne=1. 384 Ikf=. 8419 Nk=. 6328 Xtb=1. 5 Br=1. 2 Isc=26. 4p Nc=2. 088 Ikr=1. 637 Rb=6 Rc=1. 538 Cjc=23. 66p Mjc=. 33 Vjc=. 75 Fc=. 5 Cje=30. 84p Mje=. 33 Vje=. 75 Tr=648. 9n Tf=12. 74n Itf=1 Xtf=2 Vtf=30)

Visit page

Leave Comment

characters left:

Related Circuits

METAL DETECTOR Circuit

Metal Detector DIY

The heart of this DIY metal detector circuit is CS209A. The metal detector is build with one 100 µH coil. CS209A has one oscillator which forms a LC circuit, the inductance of the coil will change...

homemade Geiger counter with UGP interface

It uses very common building blocks. The high voltage power supply is a classical oscillator circuit used in many places where a low current and high voltage is needed. TR is a step-up transformer...

English Amiga Board

Digital Clock

The complete circuit diagram is shown in Fig. 1. Heart of the system is lC2, National`s MM5402 clock chip. It is an MOS monolithic large scale integrated circuit. It`s pin configuration is shown in...

Digital High/Low Logic Tester Circuit diagram

When the input signal is logic 1, the display shows `H` and the loudspeaker emits a note which is an octave higher than the `low` tone. Operation of the circuit can be seen from the circuit diagram...

Digital Voltmeter and Ammeter Circuit Module

This V/I display module is eminently suitable for building into an existing DC power supply, where it gives a precise indication of the set voltage or the current consumption of the load. In the...

Electronic Voltmeter Ammeter Circuit Using Single IC 741

Simple Electronic Multimeter High cost deters many hobbyists from buying a conventional multimeter. Since it is difficult to obtain cheap 50 uAor 100uA meters which are essential for a highly...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

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....
Ultrasonic distance finder circuit

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....
Simple Metal detector circuit with CD4030

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....
Fully automatic watering circuit for flower pots

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....
Simple deep searching metal detector circuit

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....
Sub-Harmonic Bass Converter for Electric Guitars

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,....
Echo Depth Sounding Sonar for Boats

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....
100W HiFi Audio Amplifier Circuit

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....
Plant-Pot Water Level Indicator Circuit

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.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

VISIBLE ELECTRIC CURRENT

While working on an Electricity/Electronics exhibit for the Museum of Science in Boston I...

cto frequency converter

In some cases of temperature measurements, it is more advantageous to convert the measured value...

Rangkaian Thermometer Berbasis Mikrokontroler AT89S52

This is a circuit of a microcontroller AT89S52 Thermometer and 12-bit ADC LTC1298, programs...

inductance meter adapter circuit

This is a design circuit for measure inductance of the inductor labeled LX which is the...

new 4 channel portable audio mixer

The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery,...

flashingLEDs

A few people have requested some clarification about calculating resistor values for the triac...