Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Insight and serial stacking

204.183.80.149

Posted by Victor Khomenko on May 20, 1999 at 14:51:10

In Reply to: Re: Insight and serial stacking posted by jk on May 20, 1999 at 13:11:17:

***Thank you for taking the time to write your response. I'm looking for:
one 518.1K resistor
and
one 32.25K resistor

The S105 family goes to 750k and the S106 to 1M. It was not clear if you were considering buying new parts or using something you already have. Vishay can make a resistor to pretty much any value (on order) but finding one in stock may be nearly impossible. You may end up adding a small resistor in series with your main one - that one *arguably* doesn't need to be of the same quality, say, if you add a couple of KOhm in series. You might want to call several Vishay distributors and check their stock for the nearest value just below of what you need.

Of course, those values are way too high for what I consider good range - I much prefer far lower resistance circuits. I would investigate dropping those values as much as possible, but that might require a series investigation plus larger value caps. I don't remember the circuit well, but I suppose to change it to accept a passive network would be too much work. But if you feel like it, going with purely resistive feedback for fixed gain, followed by a passive network with an add-on simply buffer, something like a MOSFET follower, would offer some nice possibilities. That, of course, may be outside of the scope of this project.

If you already have parts that you can connect in series, then your plan is fine, except I would not put any shrink material around them. I would probably simply glue parts together.

Good luck,

Victor.

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