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8 Second to 8.5 Minute Low Frequency Clock (Intervalometer for Time-Lapse Photography)

8 Second to 8.5 Minute Low Frequency Clock (Intervalometer for Time-Lapse Photography)

This circuit example highlights the use of the LTC6991 in a intervalometer for time lapse photography. In this example the LTC6991 is configured as a self-resetting circuit and generates a fixed time pulse from 8s to 64s. The LTC6991 is part of the TimerBlox family of versatile silicon timing devices with a programmable period range of 1.024ms to 9.54 hours (29.1μHz to 977Hz). This device is specifically intended for long duration timing events. A single resistor programs the LTC6991’s internal master oscillator frequency. Normally the LTC6991 oscillates with a 50% duty cycle but the reset function can truncate the pulse (reducing the duty cycle).

 


Software

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.