3-frequency oscillator

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< Analog Electronic ~ 3-frequency oscillator

eric

Posted: Thu Oct 05, 2006 2:26 am Post subject: 3-frequency oscillator

Site Admin Joined: 01 Jan 1970 Posts: 311

G. Kleine 045
The output frequency of the oscillator shown in the diagram may
be derived via two control inputs, A and B, and may, therefore
have three different values. If the logic level at both inputs is low,
the oscillator is disabled.
The oscillator proper is formed by gate IC1c. Depending on
whether a high logic level is applied to IC1a or IC1b, either network
R1-C2 or network R2-C3 determines the output frequency.
If both inputs are high, the output frequency is somewhere
between the other two. With values as indicated, the output frequencies
are 1300 Hz, 200 Hz, and 2700 Hz.
Branches R3-D1 and R4-D2 ensure that the pulse duty ratio of
the output signal is 1:1. If the oscillator is to be used in applications
where this ratio is irrelevant, the two branches may be omitted.
The oscillator is particularly suitable for use in frequency shift
keying modulators.

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