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

In summary, the individual is looking for a way to create a pulse of varying length. They have explored using a VCR/VDR or a VCO, but have not been able to find a suitable option. They are now considering using a triangle wave fed into a comparator or a 74HC4060 with a crystal and decode logic. They have also discovered the possibility of using a 4046B to create a VCO.
  • #1
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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  • #2
Triangle wave fed into a comparator with an adjustable reference.
 
  • #3
or a 74HC4060 with Xtal and a little decode logic...
 
  • #4
Thanks for the help guys. I found a way to make a VCO from a 4046B.
 

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

What is a VCR/VDR/VCO?

A VCR (Voltage-Controlled Resistor), VDR (Voltage-Dependent Resistor), and VCO (Voltage-Controlled Oscillator) are all electronic components that use a voltage input to control their output. A VCR/VDR adjusts its resistance based on the voltage input, while a VCO changes its frequency or phase. These components are commonly used in electronic circuits to create variable pulse signals.

What is the purpose of using a VCR/VDR/VCO to make a variable length pulse?

The purpose of using a VCR/VDR/VCO to make a variable length pulse is to have precise control over the duration of the pulse. By adjusting the input voltage, the output pulse can be made longer or shorter. This is useful in various applications such as in signal processing, communication systems, and electronic testing.

How do I select the right VCR/VDR/VCO for my project?

The selection of the right VCR/VDR/VCO depends on your specific project requirements. Factors to consider include the desired frequency range, voltage range, and accuracy of the output. It is also important to ensure compatibility with other components in your circuit. Consulting a datasheet or seeking guidance from a specialist can help in making the right choice.

Are there any limitations to using a VCR/VDR/VCO for variable length pulses?

Yes, there are some limitations to using a VCR/VDR/VCO for variable length pulses. These components have a limited frequency and voltage range, and their accuracy may be affected by external factors such as temperature and noise. Additionally, they may require additional circuitry for precise control, which can add complexity to the overall design.

Can I use a VCR/VDR/VCO to make other types of variable signals?

Yes, VCR/VDR/VCO can be used to create other types of variable signals such as sine waves, square waves, and triangular waves. By adjusting the input voltage, the output frequency and amplitude can be controlled, making these components versatile in generating various types of signals.

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