[sdiy] lowpass gate etc - the sounds of capacitors

[Harry Bissell Jr]

You'll need a real accurate timebase on your scope
to resolve the pulse width.

The bridge mode 'might' be more accurate...  

H^) harry

--- mikei at marketbridge.ca wrote:

> "555" timer with frequency counter approach is good
> but use a CMOS 555 
> timer instead (such as TLC555  TS555  ICM7555) as
> the CMOS unit 
> operates with much smaller leakage currents, giving
> less error with 
> smaller capacitances than the more pedestrian
> bipolar 555. Have some 1% 
> polystyrenes on hand for a calibration check.
> Mike
>