Discrete-sequence-oscillator
The swept-frequency oscillator provides a cost-effective source of discrete frequencies for testing digital circuits. This configuration generates an 80-second sequence of eight frequencies, with each frequency maintained for 10 seconds. The dwell time and the number of frequencies can be adjusted. The frequencies can vary from 0.005 Hz to 1 MHz. The programmable crystal oscillators, PXOs, IC2 and IC4, can generate 57 frequencies in response to an 8-bit external code. IC2 includes a 1-MHz crystal and produces a 0.05-Hz output, while IC4 is equipped with a 600-kHz crystal; its output is influenced by the combined outputs of the 12-stage binary counter IC3 (Q1 and Q2) and the PXO IC2. To generate additional frequencies, one or more outputs from IC3 (Q3, Q4, Q5) can be utilized to drive inputs on IC4 (P4, P5, P6). The configuration of IC2 can also be altered or driven by other logic to control the duration of each frequency. IC1, a monostable multivibrator, serves as a system reset and initiates the sequence, starting at 60 Hz, upon receiving a positive pulse.
The swept-frequency oscillator circuit is designed to facilitate the testing of digital circuits by providing a series of discrete frequencies in a controlled manner. The oscillator operates by sequencing through eight distinct frequencies over an 80-second interval, allowing for a dwell time of 10 seconds on each frequency. This flexibility in dwell time and frequency count enables users to customize the testing parameters according to specific requirements.
The core of the oscillator comprises two programmable crystal oscillators, IC2 and IC4. IC2, featuring a 1-MHz crystal, is responsible for generating a low-frequency output of 0.05 Hz. IC4, on the other hand, utilizes a 600-kHz crystal and derives its output based on the signals from IC3 and IC2. The 12-stage binary counter IC3 plays a pivotal role, with outputs Q1 and Q2 being utilized to modulate the frequency generated by IC4. Additionally, outputs Q3, Q4, and Q5 from IC3 can be employed to expand the frequency generation capabilities by driving various inputs on IC4, specifically P4, P5, and P6.
Moreover, the design allows for reconfiguration of IC2, enabling it to be driven by alternative logic circuits. This adaptability facilitates the manipulation of the duration for which each frequency is output, further enhancing the versatility of the circuit. The inclusion of IC1, a monostable multivibrator, ensures reliable system initialization by providing a reset function. Upon receiving a positive pulse, IC1 triggers the oscillator sequence, commencing at a frequency of 60 Hz.
This comprehensive configuration of the swept-frequency oscillator makes it an invaluable tool in the testing and development of digital circuits, providing a wide range of frequency outputs that can be tailored to specific testing scenarios.The swept-frequency oscillator offers an inexpensive source of discrete frequencies for use in testing digital circuits. In this configuration, the circuit generates an 80-second seguence of eight frequencies, dwelling for 10 seconds on each frequency.
You can change the dwell time or the number of frequencies. Frequencies can range from 0.005 Hz to 1 MHz. The programmable crystal oscillators, PXOs, IC2 and IC4 can each generate 57 frequencies in response to an 8-bit external code. IC2 contains a 1-MHz crystal and produces a 0.05-Hz output. IC4 contains a 600-kHz crystal; its output changes in response to the combined outputs of the 12-stage binary counter IC3 (Q1 and Q2) and the PXO IC2. To generate more frequencies, you can use one or more of IC3"s outputs, (Q3, Q4, Q5) to drive one or more of IC4"s inputs (P4, P5, P6).
Similarly, you can rewire IC2 or drive it with other logic to control the duration of each frequency. IC1, a monostable multivibrator, provides a system reset. It initiates the sequence shown, beginning at 60 Hz, in response to a positive pulse. 🔗 External reference
The swept-frequency oscillator circuit is designed to facilitate the testing of digital circuits by providing a series of discrete frequencies in a controlled manner. The oscillator operates by sequencing through eight distinct frequencies over an 80-second interval, allowing for a dwell time of 10 seconds on each frequency. This flexibility in dwell time and frequency count enables users to customize the testing parameters according to specific requirements.
The core of the oscillator comprises two programmable crystal oscillators, IC2 and IC4. IC2, featuring a 1-MHz crystal, is responsible for generating a low-frequency output of 0.05 Hz. IC4, on the other hand, utilizes a 600-kHz crystal and derives its output based on the signals from IC3 and IC2. The 12-stage binary counter IC3 plays a pivotal role, with outputs Q1 and Q2 being utilized to modulate the frequency generated by IC4. Additionally, outputs Q3, Q4, and Q5 from IC3 can be employed to expand the frequency generation capabilities by driving various inputs on IC4, specifically P4, P5, and P6.
Moreover, the design allows for reconfiguration of IC2, enabling it to be driven by alternative logic circuits. This adaptability facilitates the manipulation of the duration for which each frequency is output, further enhancing the versatility of the circuit. The inclusion of IC1, a monostable multivibrator, ensures reliable system initialization by providing a reset function. Upon receiving a positive pulse, IC1 triggers the oscillator sequence, commencing at a frequency of 60 Hz.
This comprehensive configuration of the swept-frequency oscillator makes it an invaluable tool in the testing and development of digital circuits, providing a wide range of frequency outputs that can be tailored to specific testing scenarios.The swept-frequency oscillator offers an inexpensive source of discrete frequencies for use in testing digital circuits. In this configuration, the circuit generates an 80-second seguence of eight frequencies, dwelling for 10 seconds on each frequency.
You can change the dwell time or the number of frequencies. Frequencies can range from 0.005 Hz to 1 MHz. The programmable crystal oscillators, PXOs, IC2 and IC4 can each generate 57 frequencies in response to an 8-bit external code. IC2 contains a 1-MHz crystal and produces a 0.05-Hz output. IC4 contains a 600-kHz crystal; its output changes in response to the combined outputs of the 12-stage binary counter IC3 (Q1 and Q2) and the PXO IC2. To generate more frequencies, you can use one or more of IC3"s outputs, (Q3, Q4, Q5) to drive one or more of IC4"s inputs (P4, P5, P6).
Similarly, you can rewire IC2 or drive it with other logic to control the duration of each frequency. IC1, a monostable multivibrator, provides a system reset. It initiates the sequence shown, beginning at 60 Hz, in response to a positive pulse. 🔗 External reference