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one-shot ramp with voltage control of decay rate

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danjel

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I am looking for a relatively low part circuit that would produce one-shot ramps (downward) and the decay rate can be voltage controlled. This would essentially be a voltage controlled decay envelope.

Is there maybe something 555 based that is suitable?
 
Ramp voltage? Rate? Duration? Load? Linearity? Tolerance? Trigger?
 
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Ramp voltage? Rate? Duration? Load? Linearity? Tolerance? Trigger?

-voltage would be peak of 5v.
-duration (set by timing cap surely) would be min 0.5ms max. 10s
-exponential or linear decay
-tolerance? not sure...
-load not important (I will buffer this voltage)
-Trigger: 5V trigger pulse to initiate the decay envelope.
 
What is your supply voltage?
 
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-duration (set by timing cap surely) would be min 0.5ms max. 10s
...............................
Do you need the full 0.5ms to 10s variation solely using the control voltage with no range switching? That's a large range (20,000:1) to vary without range switching.
 
I was going to ask the same question :). Doing it without range switching, in the analogue domain, would be extremely difficult to achieve with any degree of accuracy or repeatability. Have you considered a digital approach (A/D, MCU, D/A)?
 
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