quick electronic formulars

monoflop time:
t=0,7*(C1*R2) ==
C1=t/(0,7*R2) ==
R2=t/(0,7*C1) ==

beispiel: C1=22µF, R2=10K == t=0.154 Sec.
beispiel: C1=22µF, R2=100K == t=1.54 Sec.

effektiv wert wechselspannung
1/(wurzel 2) * wechselspannung.
Beispiel:
~12V * 1/(Wurzel 2) =
~12V * 1/1,4142 =
~12V * 0,7071 =
~12V = 8,4852V eff.
aber meistens sind ~12V nur der Effektivwert und tatsächlich 17V oder gar 20V Spitze Spitze.

spannungsteiler:
u2 (an r2)

U2 = U * ( R2 / (R1+R2) )

o----o  U
     _
    | |
    | | R1
     -
     o-------o
     |      
     o
     _
    | | R2     U2
    | |
     -
     o-------o
     |
o----o  GND

lm317 calc:
http://oktay.com/lm317.html

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