Thanks, that's my site and my designs.
FYI, the inductance meter I've not even breadboarded yet. So let me know how it works out, if you get to it before I do.
Steve Greenfield
--- In Homebrew_PCBs@yahoogroups.com, "Jim Barnes" <jim@...> wrote:
>
> Hi,
>
>
>
> What a good idea! Also, check the other file on this site; it's a very
> similar inductance meter. That's more interesting to me because I have a
> way to measure capacitance ($7.98 new surplus Craftsman DMM I discovered
> at my local electronics shop. What a deal!) , but have no way to measure
> inductance at all.
>
>
>
> Jim
>
>
>
> From: Homebrew_PCBs@yahoogroups.com
>
> A couple of 555 timers makes a surprisingly accurate and sensitive
> capacitance meter. Uses your DMM in 200mV mode. In the lowest setting,
> 1mV = 1pF. Measures down to 0.1pF resolution, keeping in mind it isn't
> that accurate, but you can see the capacitance change as you wave your
> hands around.
>
> http://www.polyphoto.com/tutorials/ElectronicCircuits/
>
> Build it with parts from your junkbox for next to nothing.
>
> Or if you can program microcontrollers, do the same thing in software.
> Regular clock followed by a monostable, the cap under test is in the
> monostable. Measure the time it takes to charge the capacitor.
>
> Steve Greenfield
>