transistor calculations

this contains the cheat sheet for calculating resistances, currents and voltages for parallel, series and mixed connections R1 <- U0 | R2 ---- R3 ------- R7 <- U1 | | | R4 ---- R5 ---- R6 -- R8 <- U2 *U1, U2 and U3 is voltage for 1, 2 and 3 line-levels (up to down) U1=U0-R1*I U2=U1-R23*I U3=U2-R456*I R23=R2*R3/(R2+R3) R456=1/(1/R4+1/R5+1/R6) R78=R7+R8 R=1/(1/(R456+R23)+1/R78)+R1 ---- R78 ---- R78=R7+R8 I78=(U1-U3)/R78 U7=U1-I78*R7 U8=U7-I78*R8 ---- R23 ---- I2=(U1-U2)/R2 I3=(U1-U2)/R3 R2=(U1-U2)/I2 R3=(U1-U2)/I3 U=U1-R2*I2 U=U1-R3*I3 R2=1/(1/R23-1/R3) R3=1/(1/R23-1/R2) ---- R456 ---- I4=(U2-U3)/R4 I5=(U2-U3)/R5 I6=(U2-U3)/R6 R4=(U2-U3)/I4 R5=(U2-U3)/I5 R6=(U2-U3)/I6 U=U2-R2*I4 U=U2-R3*I5 U=U2-R3*I6 R4=1/(1/R456-1/R5-1/R6) R5=1/(1/R456-1/R4-1/R6) R6=1/(1/R456-1/R4-1/R5)

published 3 years ago