[TI-H] Re: [A83] Re: OT: Clock with resistor and capacitor
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[TI-H] Re: [A83] Re: OT: Clock with resistor and capacitor
Thanks
>
> One last reply,
> You are looking for a relaxation oscillator. There is a time
> constant for all resistor-capacitor circuits defined as RC or R*C. This
> is used to determine the charge/discharge time for a given capacitor.
> It is logarithmic in nature and I cannot remember the equation off the
> top of my head.
>
> http://www.rwc.uc.edu/koehler/biophys/4g.html
>
> that should help you!!!
>
> Here is the schematic for the relaxation oscillator...
>
> http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/relaxo.html#c2
>
> and yes one transistor is needed. If you intend to square off your wave
> form try running it through an inverter or two!!! If you cannot use
> CMOS chips then an inverter can be easily made using one n-type and one
> p-type transistor between Vcc and ground.
>
> Vcc
> ________
> _|
> ||
> |---o|| p-type
> | ||_
> | |
> in --| |_______ output
> | _|
> | ||
> |----|| n-type
> ||_
> __|__
> ___ gnd
> _
>
>
> lemme know if you need anything else
>
>
>
References: