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

AI Thread Summary
To create a variable length pulse, a VCR/VDR or VCO is needed to control the timing of a monostable pulse. The user has struggled to find suitable components, specifically noting that the Siliconix VCR2N/4N/7N series is discontinued and unavailable. Suggestions include using a triangle wave with a comparator or a 74HC4060 with crystal and decoding logic. The user has also discovered a method to construct a VCO using a 4046B. The discussion emphasizes the challenge of sourcing appropriate components for pulse generation.
madmike159
Gold Member
Messages
369
Reaction score
0
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?
 
Engineering news on Phys.org
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.
 
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Thread 'EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity)'

Hello dear reader, a brief introduction: Some 4 years ago someone started developing health related issues, apparently due to exposure to RF & ELF related frequencies and/or fields (Magnetic). This is currently becoming known as EHS. (Electromagnetic hypersensitivity is a claimed sensitivity to electromagnetic fields, to which adverse symptoms are attributed.) She experiences a deep burning sensation throughout her entire body, leaving her in pain and exhausted after a pulse has occurred...
View full post »

Similar threads

Exhaust and engine accoustics for asthetics and performance
Replies
2
Views
7K
Mathematica This Week's Finds in Mathematical Physics (Week 257)
Replies
5
Views
4K
Mathematica This Week's Finds in Mathematical Physics (Week 230)
Replies
1
Views
2K
Mathematica This Week's Finds in Mathematical Physics (Week 230)
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top