Hello,
I was just wondering if anyone knows how to determine the resistor component values of an oscillator circuit(555 timer IC type), when a pre-determined frequency is required.
i.e, lets say I want the oscillator to drive some IR LED's at 38 kHz.......how would I determine the resistor values (usually two resistors in this circuit), and also the capacitor...
gs
For astable operation: f = 1/(.693 x C x (R1 + 2 x R2))
See the url:
On Thu, 18 Sep 2003 03:00:39 GMT, snipped-for-privacy@bellatlantic.net Gave us:
snip
555 calculator yields over 32,000 hits on google search.
I assume you want this for a canned IR-receiver? In that case remember that most such receivers are not suited for receiving a continuous IR stream: you will have to modulate the IR stream to assure that there is a minimum amount of 'silence'. Check your receivers datasheet for the details.
Wouter van Ooijen
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