Hartley Oscillator


Posted on Feb 6, 2014

The HARTLEY OSCILLATOR is an improvement over the Armstrong oscillator. Although its frequency stability is not the best possible of all the oscillators, the Hartley oscillator can generate a wide range of frequencies and is very easy to tune. The Hartley will operate class C with self-bias for ordinary operation. It will operate class A when the


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

output waveform must be of a constant voltage level or of a linear waveshape. The two versions of this oscillator are the series-fed and the shunt-fed. The main difference between the Armstrong and the Hartley oscillators lies in the design of the feedback (tickler) coil. A separate coil is not used. Instead, in the Hartley oscillator, the coil in the tank circuit is a split inductor. Current flow through one section induces a voltage in the other section to develop a feedback signal. Series-Fed Hartley Oscillator One version of a SERIES-FED HARTLEY OSCILLATOR is shown in the figure below. The tank circuit consists of the tapped coil (L1 and L2) and capacitor C2. The feedback circuit is from the tank circuit to the base of Q1 through the coupling capacitor C1. Coupling capacitor C1 prevents the low dc resistance of L2 from placing a short across the emitter-to-base junction and resistor RE. Capacitor C3 bypasses the sine-wave signal around the battery, and resistor RE is used for temperature stabilization to prevent thermal runaway. Degeneration is prevented by CE in parallel with RE. The amount of bias is determined by the values of RB, the emitter-to-base resistance, the small amount of dc resistance of coil L1, and the resistance of RE. When a voltage is applied to the circuit, current from the battery flows through coil L1 and to the emitter through RE. Current then flows from the emitter to the collector and back to...




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Hybrid Electrostatic Amplifier
Variable Square wave oscilator with 555 circuit
Universal wiper delay
The ICL7135 Integrating A/D Converter Functional Diagram and Datasheet
mixer
FM Wireless HI-FI circuit
Tablet Reminder Uses Watch Module
Digital Combination LockCircuit Project Tutorial
Tip a battery discharge control circuit



Top