On Tue, 23 Feb 1999 15:14:41 -0800, Lynx {Glenn Jones} wrote:

>I need to calculate a bias resitor? i was just going to use 10K, is this
>not a good value?
>

What he is trying to say is that you don't need to worry about the value of the
base bias resistor when you ground the emitter and put the LED on the collector
in series with the "small value" resistor.

Dan

>------------------------------------------------------------------------------
>A member of the PI-100 Club:
>3.1415926535897932384626433832795028841971693993751
>058209749445923078164062862089986280348253421170679
>
>On Tue, 23 Feb 1999, Gerhard Fiedler wrote:
>
>> At 14:35 02/23/99 -0800, Lynx {Glenn Jones} wrote:
>> >What is your reasoning behind this?
>>
>> when the emitter is on ground, the base voltage (when on) is nearly
>> independent from the diode characteristics, and therefore it's a bit easier
>> to calculate the correct base resistor. if you leave enough margin, it
>> probably doesn't matter much, but you have better control and the necessary
>> margin is smaller.
>>
>> ge
>>
>