Homebrew PCBs

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
>