Finding the Right VCR/VDR or VCO to Make a Variable Length Pulse

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Discussion Overview

The discussion focuses on creating a variable length pulse using either a VCR/VDR or a VCO. Participants explore different methods and components that could achieve this goal, including monostable configurations and various integrated circuits.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses the need for a VCR/VDR or VCO to control the length of a monostable pulse and mentions difficulties in sourcing components like the VCR2N/4N/7N from Siliconix.
  • Another participant suggests using a triangle wave fed into a comparator with an adjustable reference as a potential solution.
  • A different suggestion involves using a 74HC4060 with a crystal and some decoding logic to achieve the desired pulse length.
  • A later reply indicates that a participant has found a way to create a VCO using a 4046B, implying a potential solution has been identified.

Areas of Agreement / Disagreement

Participants present multiple competing views and methods for generating a variable length pulse, with no consensus on a single solution. The discussion remains unresolved regarding the best approach or component.

Contextual Notes

Participants do not clarify specific requirements for the pulse length or the operational context, which may affect the applicability of the proposed solutions.

madmike159
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I need to make a pulse of varing length. Either I need a VCR/VDR to control the length of a momo stable pules, or a VCO to trigger a preset monostable at different times.

I have been trying to find some thing to do the job for me but havn't had any luck. The VCR2N/4N/7N made by Siliconix are no longer made, and I can't find any where that stock them or any thing similar.

Can anyone tell me where to get hold of something which will work?
 
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Triangle wave fed into a comparator with an adjustable reference.
 
or a 74HC4060 with Xtal and a little decode logic...
 
Thanks for the help guys. I found a way to make a VCO from a 4046B.
 

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