All posts in the 'Signal generator' Category

Voltage Controlled LFO

Posted on 02 Sep 2008

Voltage Controlled LFO
This is a nice LFO for all of your modulation needs. The frequency can be voltage controlled to add a new dimension to your sound palette. The pulse width of the rectangle wave can be varied between approximately 10% and 90% again lending variability to the modulation capabilities of this LFO. Voltage control can be used to vary the pulse width as well. If you power your circuits with +/-15 volts then observe the recommended changes that are noted on the schematic.[more]


Posted in : Signal generator

PIC-Based function generator

Posted on 14 Aug 2008

PIC-Based function generator
The project is fairly simple in concept to use the DevaSys EZ-USB protoboard as an intermediary between a Microchip PIC18F452 microcontroller and a PC to create a computer-controlled function generator for creating various types of waveforms such as sine, sawtooth, square, and triangle. [more]

Posted in : PIC projects | Signal generator

ELECTRONICS SYNTHESIZER

Posted on 04 Aug 2008

ELECTRONICS SYNTHESIZER
The heart of the synthesizer is a set of 2 Analog Devices AD9850 direct digital synthesis (DDS) chips. These provide 2 channels of sinewave output which may differ in frequency and relative phase. The output stage of the synthesizer also includes separate variable attenuators for the 2 channels. These attenuators have a range of 0.0 - 63.9 dB of attenuation, in 0.1 dB steps. The user therefore has control over five parameters: 2 output frequencies, 2 output attenuations, and relative phase between the 2 channels.[more]

Posted in : Signal generator

GPS-based universal clock generator

Posted on 04 Aug 2008

GPS-based universal clock generator
Almost all commercially available GPS OEM modules provide a 1pps output, synchronized with GPS time. This pulse could be used as a reference to generate accurate high-frequency clocks, but special design has to address the short-term jitter affecting the 1pps signal. As a general guideline, an oven-stabilized crystal oscillator who guarantees the short-term stability is synchronized with the GPS 1pps for the long-term accuracy.[more]

Posted in : GPS projects | Signal generator

10MHz DDS Sine/Square Function Generator based on the AD9835

Posted on 01 Aug 2008

10MHz DDS Sine/Square Function Generator based on the AD9835
Here is an extremely simple and low cost Sine/Square wave generator based on the Analog Devices AD9835 Direct Digital Synthesis (DDS) Generator chip. The frequency can be set for any frequency from 1Hz to 10MHz in 1Hz resolution steps! All this with three push buttons and a novel “sliding window” LED display. The controller chip is a Microchip PIC16F628. [more]

Posted in : PIC projects | Signal generator

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