Tag Archives: Oscillators

PC (Audio) Signal Generator Using RS232 Port

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Using an RS232 port, we can generate square wave oscillation when transmitting data, and this can be “misused” as signal generator (square wave generator). This is a PC Signal generator produce a square wave in audible frequency range. This circuit utilize a transmission of a “U” character from ASCII character… Read more »

Astable Flip-flops

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Astable Flip-Flop Circuits The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with the LEDs in the emitters instead of collectors as is normally done. (There is another good reason to put them in the emitters –… Read more »

Two-Transistor Atomic Frequency Standard

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Two-Transistor Atomic Frequency Standard Pretty ambitious title, wouldn’t you say? Well, follow the reasoning: If you lower the voltage on the two-transistor flasher to 1.5 volts, the loop gain drops too low for sustained flashing. (See the circuit below.) But, the circuit is highly regenerative and only needs a very… Read more »

Wien Bridge Oscillator

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It is one of the most popular type of oscillators used in audio and sub-audio frequency ranges (20 – 20 kHz). This type of oscillator is simple in design, compact in size, and remarkably stable in its frequency output. Furthermore, its output is relatively free from distortion and its frequency… Read more »

Types of Oscillations

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This article has two sections: One discusses criteria for selecting an oscillator while other one discusses various types of oscillations. 1. Selection of an Oscillator 2. Types of Oscillations

Tuned Collector Oscillator

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The basic circuit of a tuned collector oscillator is shown in figure. It is called the tuned-collector oscillator, because the tuned circuit is connected to the collector. The tuned circuit, constituted by the capacitor C and transformer primary coiL, forms the load impedance and determines the frequency of oscillation. The… Read more »

Tuned Base Oscillator

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When a parallel tuned L-C circuit is placed in the base-to-ground circuit, the oscillator is known as the tuned-base oscillator. The basic circuit of a tuned-base oscillator is shown in figure. The circuit is also named as the tickler oscillator or Armstrong oscillator (named after its inventor). The dc bias… Read more »

Transistor Phase Shift Oscillator

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The circuit arrangement of a phase-shift oscillator using N-P-N transistor in CE configuration is shown in figure. As usual, the voltage divider R1-R2 provides dc emitter base bias, RE and CE combination provides temperature stability and prevent ac signal degeneration and collector resistor RC controls the collector voltage. The oscillator… Read more »

Transistor Oscillators

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Essentials of Transistor Oscillators An oscillator must have the following three elements Oscillatory circuit or element. Amplifier. Feedback network. The oscillatory circuit or element, also called the tank circuit, consists of an inductive coil of inductance L connected in parallel with a capacitor of capacitance C. The frequency of oscillation… Read more »

Sweep Frequency Generator

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Sweep-Frequency Generator The working of a sweep-frequency generator is explained in the article below. The working and block diagram of an electronically tuned sweep frequency generator and its different parameters are also explained. Related Article SIGNAL GENERATORS Asweep frequency generator is a type of signal generator that is used to… Read more »