#MACSPICE PARALLEL COMPONENTS HOW TO#
#MACSPICE PARALLEL COMPONENTS SERIES#

#MACSPICE PARALLEL COMPONENTS SERIES#

The table will still help us manage the different values for series-parallel combination circuits, but we’ll have to be careful how and where we apply the different rules for series and parallel. However, this circuit’s solution will be more complex. Likewise, if the above circuit were simple parallel, we could just solve for branch currents, add up branch currents to figure the total current, and then calculate total resistance from total voltage and total current. There exists more than one path for current to travel (not series), yet there are more than two sets of electrically common points in the circuit (not parallel).īecause the circuit is a combination of both series and parallel, we cannot apply the rules for voltage, current, and resistance ”across the table” to begin analysis like we could when the circuits were one way or the other.įor instance, if the above circuit were simple series, we could just add up R1 through R4 to arrive at a total resistance, solve for total current, and then solve for all voltage drops. The current exits the bottom of the battery, splits up to travel through R3 and R4, rejoins, then splits up again to travel through R1 and R2, then rejoins again to return to the top of the battery. This circuit is neither simple series nor simple parallel. Take the following circuit, for instance: Series-Parallel combination circuit Instead, we will have to identify which parts of that circuit are series and which parts are parallel, then selectively apply series and parallel rules as necessary to determine what is happening. However, if circuit components are series-connected in some parts and parallel in others, we won’t be able to apply a single set of rules to every part of that circuit. Resistances diminish to equal total resistance.Branch currents add to equal total current.All components share the same (equal) voltage.With simple parallel circuits, all components are connected between the same two sets of electrically common points, creating multiple paths for electrons to flow from one end of the battery to the other: Resistances add to equal total resistance.All components share the same (equal) current.Voltage drops add to equal total voltage.With simple series circuits, all components are connected end-to-end to form only one path for electrons to flow through the circuit: There is a comprehensive set of documentation, tutorials and examples for MacSpice at You can also email for additional advice and support.Solve Electric resistance problems (series, parallel combination circuit) easily | Class 10 In practice it is easier to identify the sources representing the power supplies, and just sum the reported dissipation for these. These need to be excluded from the calculation. However, many so-called macro models for devices use virtual sources (and other components) as part of the model. The problem is that the SPICE2 method is okay for simple circuits where adding up the the power supplied by every source is what you want.

Something that people sometimes miss with Spice 3 is the automatic calculation of the power dissipation of a circuit which SPICE2 used to produce. control/.endc lines, or in a script file. These commands can be stored with the netlist between. Circuit_spice3.src file ends above this line -Īnd then type the following commands at the command line:Įtc. Circuit_spice3.src file starts below this line.

To get the results you seek using the Spice 3 as nature intended use: Since VT220s could only display 24 lines of 132 characters with no scroll-back having large amounts of data spew out by default was counterproductive so, by default Spice 3 does nothing until asked. It was also possible to run (small) simulations interactively in a matter of minutes. Circuit_spice2.src file ends above this line -īy 1989, when Spice 3 came out, most people would have used a terminal such as a VT100 to review the results of simulations. Circuit_spice2.src file starts below this line.

#MACSPICE PARALLEL COMPONENTS HOW TO#

So, here is how to make MacSpice (roughly) reproduce this behaviour: One was expected not to waste a second of precious CPU time so by default it produced a dump of everything onto a bail of line-printer paper to study while waiting for the next place in the queue. At that time circuit simulation was typically performed by feeding punched cards into a mainframe and waiting many hours. This was a fortran version of Spice released in 1983. Which is using SPICE2.6G for its examples.

Macspice parallel components