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Common Resistor values (band 1 ~ 3) 0 Black 1 Brown 2 Red 3 Orange 4 Yellow 5 Green 6 Blue 7 Violet 8 Gray 9 White gold .1 silver .01
Tolerance +/- % 20 no band 10 silver 5 gold
Common Resistor color bands and what each position means -
What is its resistance value? __________ What is its tolerance? _______
Precision Resistor Values (bands 1 ~ 4) 0 Back 1 Brown 2 Red 3 Orange 4 Yellow 5 Green 6 Blue 7 Violet 8 Gray 9 White gold .1 silver .01
Tolerance 1 brown 2 red 3 orange 10 silver 5 gold
Precision Resistor color bands and what each position means -
What is its resistance value? _______ What is its tolerance? _______
The top row of a patchbay jackfield is for __________ The bottom row of a patchbay jackfield is for_________
When patching into the top row of a 1/2 - normal patch point, the signal Does/Does not go to the patch point directly underneath. (Circle one)
When patching into the top row of a Full - normal patch point, the signal Does/Does not go to the patch point directly underneath. (Circle one)
An Independent Patch point os typically used for 2 things: ______________ _______________
Mults are multiple patch points wired in ______ so that the signal from one patch is available on all the other patch points in that MULT
The 3 rules for a Series Circuit Current ___________________________________________ To get total Resistance ________________________________________ Volts ______________________________________________
The 3 rules for a Parallel Circuit Current _____________________________________________ To get total Resistance _____________________________________ Total resistance is always ___________ than the smallest resistor Volts ________________________________
What is the total resistance of this series circuit below? __________________
Show the IR voltage drop for each resistor. Show your work.
Bonus Use the Voltage Division formula for the same circuit. Don’t have to figure Current. Show your work.
What is the total resistance for this parallel circuit below? __________
Show the current for each individual branch.
What is the total current for the above parallel circuit? _______
What does Unity Gain mean? _______________________________
Impedance Bridging means __________________________________________
Balanced lines have _____ signal leads and a shield
Unbalanced lines have _____ signal lead and a shield
The 3 signal levels of Pro Audio are ____________, ________________, and _______________ level
Standard Operating level is: ________dBv = ____dBVU = _______volts. 0 dBv=________volts
*Reference Formulas:
Ohm’s Law V = A x R A = V / R R = V / A
Series Resistance R = R1 + R2 + R3 +etc. = total sum
Parallel resistance (reciprocate the reciprocals) R = 1/R1 + 1/R2 + 1/R3 etc. added Then: 1/sum of above = total resistance
Power formulas P=I x E P = E^2/R P = I^2 /R
Wavelength W = velocity/frequency = 1130 (ft per sec)/1000 Hz = 1.13 ft
dB Watts 10xlog(E1/E0)
dBu, dBv, dBSPL 20xlog(E1/E0)
Voltage drop for series resistance (I x R) + (I x R) + (I x R) etc. =
Bel Decibel dBm dBu dBv dBV
-------------------------
*Answers:
2300Ω = 2.3kΩ 5%
647kΩ 1%
Output Input
Does Does not
Outboard gears Tie lines
Parallel
Same everywhere based on resistances Just add each resistance Drop after resistor from total source of voltages to 0 voltage
Every new branch adds currents Total = 1/1/R1 + 1/R2 + 1/R3 + etc = reciprocate then plus, then finally reciprocate the results again. Less Same in every branch
Rtot = R1 + R2 = 4Ω I = 10V/4Ω = 5/2 = 2.5A. Therefore in R2, IxR2 = 2.5 x 2Ω= 5 volts drop. (E2=5 volts) Since R1 = R2, I x R1=5 volts (E1=5 volts) drop. (Etotal = E1(=IR1) + E2(=IR2) = 5 + 5 = 10V)
Ei = Etotal(Ri / Rtotal) (i, positive integer, = 1, 2, 3, …) so, since Total = 10V, Rtotal = 4Ω, therefore E1 = 10 x (2/4) = 5V similarly, E2 = 10 x (2/4) = 5V
1/1/100 + 1/10 = 1/11/100 = 100/11 = 9.0909…=9.09 therefore, 9.09 Ω
I1 = E/R1 = 10/100 = 0.1A I2 = E/R2 = 10/10 = 1 A
Itotal = I1 + I2 = 1.1A or Etotal/Rtotal = 10V/9.09Ω = 1.1A
Output = Input in every gain stage Input impedance is always at least 10 times higher than Output’s
2 1
Mic, Line and Speaker
+4, 0, 1,23 0.775
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