Electronic circuits > Generators > Simple IF Signal Generator
Simple IF Signal GeneratorHere is a versatile circuit of IF signal generator which may be of interest
to radio hobbyists and professionals alike.Transistors T1 and T2 form an astable
multivibrator oscillating in the audio frequency range of 1 to 2 kHz. RF
oscillator is built around transistor T3. Here again a 455kHz ceramic
filter/resonator is employed for obtaining stable IF. The AF from multivibrator
is coupled from collector of transistor T2 to emitter of transistor T3 through
capacitor C3. The tank circuit at collector of transistor T3 is formed using
medium wave oscillator coil of transistor radio, a fixed 100pF capacitor C5 and
half section of a gang capacitor (C6).
The oscillator section may be easily modified for any other intermediate
frequency by using ceramic filter or resonator of that frequency and by making
appropriate changes in the tank circuit at collector of transistor T3. Slight
adjustment of bias can be affected by varying values of resistors R6 and R7, if
required
Published on: 2004-08-21 (3140 reads)
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