Low-frequency-fm-generators

Description: Two FM generators are presented for low frequency applications with a center frequency of less than 0.5 MHz. Each generator utilizes a 566 function generator as a modulation generator and a second 566 as the carrier generator. Capacitor C1 selects the modulation frequency adjustment range, while C1 determines the center frequency. Capacitor C2 serves as a coupling capacitor, which must be sufficiently large to prevent distortion of the modulating waveform. If a frequency sweep in a single direction is desired, the 566 ramp generators described in this section can be employed to drive the center generator.

The circuit consists of two 566 function generators, which are versatile integrated circuits capable of generating various waveforms. The first 566 functions as the modulation generator, where it produces a modulating signal that varies the frequency of the carrier signal generated by the second 566. The modulation frequency range is adjustable through the selection of capacitor C1, which is critical for tuning the system to the desired modulation characteristics.

For the carrier generator, the second 566 is configured to produce a stable carrier frequency, which can be set using the appropriate components in the circuit. The center frequency, which defines the primary operating frequency of the FM generator, is determined by the values of the components surrounding the second 566.

Capacitor C2 plays a vital role in the circuit as a coupling capacitor. Its primary function is to allow the modulating signal to pass while blocking any DC component, thus preventing distortion of the waveform. The value of C2 should be selected to ensure that it does not affect the integrity of the modulating signal, particularly at the frequencies of interest.

In scenarios where a frequency sweep is required in only one direction, the ramp generators provided in this section can be utilized. These ramp generators can effectively modulate the carrier frequency by varying it linearly over time, creating a continuous frequency shift that can be advantageous in various applications, such as signal processing or communication systems.

Overall, this configuration of FM generators is suitable for low-frequency applications, providing flexibility in modulation and carrier frequency generation, making it a valuable tool for electronic designers and engineers working in the field of communication and signal processing.Here are two FM generators for low frequency, less than 0.5 MHz center frequency, applications. Each uses a 566 function generator as a modulation generator and a second 566 as the carrier generator. Capacitor Cl selects the modulation frequency adjustment range and Cl selects the center frequency. Capacitor C2 is a coupling capacitor which only needs to be large enough to avoid distorting the modulating waveform. If a frequency sweep in only one direction is required, the 566 ramp generators given in this section can be used to drive the center generator.