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Yeh, I wanted to get alternative option for 2N5459 for #2 post's limiter circuit. But thinking to leave the project. But will make if I findBut apparently the OP wants to use specific parts so that really means a redesign of the entire limiter section.
Tried that. Won't work. A cad cell has a delay much like a RC. Cutting the drive voltage in half does not change the delay it is still one RC. I did a frequency sweep and found the cell had a frequency response of about 100hz. So in the drive amplifier for the LED I added a speed up capacitor that caused that amplifier to have a gain of one below 100hz and have a gain of 10 at 1khz. This really helped. That gave a nearly flat response to 1khz. The response was some what dependent on drive level.Another idea for the CdS cell is to limit the dynamic range by design. For example, if we find a cell that has a 5ms time constant then that is going to be over a wide dynamic range. Limiting the dynamic range to 1/2 of that by design brings us down to 2.5ms, and that's not asking too much really.
Hi,Hi,
What would it cost to mail one from USA to you?
I am from Nepal (between China and India). 'is there any one close' mean?Ronsimpson> Willen, where are you. What country?
Is there any one close?
Hi again,
Well how bad do you want to build this thing? Maybe one of us here could get the FET's and mail a few to you. Would that be enough to get the thing built?
Instead of trying to find an old Jfet that is now obsolete, why not use a modern VCA (voltage controlled amplifier) IC instead?
But the modern ICs I have found are only made in a tiny surface-mount package.
MOSFETs work well.
I think I brought up "US 5808516 A" back many posts.