Basic Elements

See Electrical Elements for complete class definitions for these elements.

Two-terminal

Two-terminal devices subclass schemdraw.elements.Element2Term, and have leads that will be extended to make the element the desired length depending on the arguments. All two-terminal elements define start, end, and center anchors for placing, and a few define other anchors as shown in blue in the tables below. Some elements have optional parameters, shown in parenthesis in the table below.

Styled Elements

These elements change based on IEEE/U.S. vs IEC/European style configured by schemdraw.elements.style(). Selectable elements, such as Resistor, point to either ResistorIEEE or ResistorIEC, for example.

IEEE Style

IEEE style, common in the U.S., is the default, or it can be configured using

elm.style(elm.STYLE_IEEE)

IEC/European Style

IEC style can be enabled using

elm.style(elm.STYLE_IEC)

Resistors

Both styles of resistors are always available using these classes.

Capacitors and Inductors

Diodes

Pathological

Miscellaneous

Sources and Meters

Switches

Lines and Arrows

Single-Terminal

Single terminal elements are drawn about a single point, and do not move the current drawing position.

Power and Ground

Antennas

Connection Dots

Switches

The standard toggle switch is listed with other two-terminal elements above. Other switch configurations are shown here.

Single-pole double-throw

Two options for SPDT switches can be also be drawn with arrows by adding action=’open’ or action=’close’ parameters.

Double-pole

DPST and DPDT switches have a link parameter for disabling the dotted line lnking the poles.

Rotary Switch

The rotary switch schemdraw.elements.switches.SwitchRotary takes several parameters, with n being the number of contacts and other parameters defining the contact placement.

DIP Switch

A set of switches in a dual-inline package, where can show each switch flipped up or down. See schemdraw.elements.switches.SwitchDIP for options.

Audio Elements

Speakers, Microphones, Jacks

Labels

The Label element can be used to add a label anywhere. The Gap is like an “invisible” element, useful for marking the voltage between output terminals.

Operational Amplifiers

The schemdraw.elements.opamp.Opamp element defines several anchors for various inputs, including voltage supplies and offset nulls. Optional leads can be added using the leads parameter, with anchors exteded to the ends of the leads.

Transistors

Bipolar Junction Transistors

Field-Effect Transistors

“Two-Terminal” Transistors

Another set of transistor elements subclass schemdraw.elements.Element2Term so they have emitter and collector (or source and drain) leads extended to the desired length. These can be easier to place centered between endpoints, for example.

Two-ports

Twoport elements share the interface defined by schemdraw.elements.twoports.ElementTwoport, providing a set of anchors and various styling options. The terminals and box can be enabled or disabled using the terminals and box arguments. In addition, the boxfill, boxlw, and boxls provide the option to style the outline separately from other elements.

Generic

Transactors (ideal amplifiers)

Like the generic twoport, the transactors provide the option to reverse the direction of the output or current using the reverse_output argument.

Pathological

Custom

The schemdraw.elements.twoports.ElementTwoport class can be used to define custom twoports by specifying an input_element and output_element. The bpadx, bpady, minw, unit, width can be used to tune the horizontal and vertical padding, minimum width of the elements, length of components, and width of the twoport respectively.

d += elm.ElementTwoport(input_element=elm.Inductor2(),
                        output_element=elm.SwitchReed(),
                        unit=2.5, width=2.5).anchor('center')

d += elm.ElementTwoport(input_element=elm.Lamp(),
                        output_element=elm.Photodiode().reverse().flip(),
                        width=3).anchor('center').at([7,0])

Cables

schemdraw.elements.cables.Coax and schemdraw.elements.cables.Triax cables are 2-Terminal elements that can be made with several options and anchors. Coax parameters include length, radius, and leadlen for setting the distance between leads and the shell. Triax parameters include length, radiusinner, radiusouter, leadlen, and shieldofststart for offseting the outer shield from the inner guard.

Transformers

The schemdraw.elements.xform.Transformer element is used to create various transformers. Anchors p1, p2, s1, and s2 are defined for all transformers. Other anchors can be created using the taps method to add tap locations to either side.

Here is a transformers with anchor “B” added using the tap method. Note the tap by itself does not draw anything, but defines a named anchor to connect to.

with schemdraw.Drawing() as d:
    d.config(fontsize=12)
    x = d.add(elm.Transformer(t1=4, t2=8)
              .tap(name='B', pos=3, side='secondary'))
    d += elm.Line().at(x.s1).length(d.unit/4).label('s1', 'rgt').color('blue')
    d += elm.Line().at(x.s2).length(d.unit/4).label('s2', 'rgt').color('blue')
    d += elm.Line().at(x.p1).length(d.unit/4).left().label('p1', 'lft').color('blue')
    d += elm.Line().at(x.p2).length(d.unit/4).left().label('p2', 'lft').color('blue')
    d += elm.Line().at(x.B).length(d.unit/4).right().label('B', 'rgt').color('blue')