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.

Resistors

Resistors elements change style 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)

Resistor

ResistorVar

Potentiometer

Photoresistor

Fuse

IEC/European Style

IEC style can be enabled using

elm.style(elm.STYLE_IEC)

Resistor

ResistorVar

Potentiometer

Photoresistor

Fuse

All Resistors

Either IEEE or IEC styles are always available with these Elements.

ResistorIEEE

ResistorIEC

ResistorVarIEEE

ResistorVarIEC

PotentiometerIEEE

PotentiometerIEC

PhotoresistorIEEE

PhotoresistorIEC

FuseUS

FuseIEEE

FuseIEC

Rshunt

Capacitors and Inductors

Capacitor

Capacitor(polar=True)

Capacitor2

Capacitor2(polar=True)

CapacitorVar

CapacitorTrim

Inductor

Inductor2

Inductor2(loops=2)

Diodes

All diodes may be filled by passing fill=True.

Diode

Diode(fill=True)

Schottky

DiodeTunnel

DiodeShockley

Zener

DiodeTVS

Varactor

LED

LED2

LED(fill=’red’)

Photodiode

Diac

Triac

SCR

Pathological

Nullator

Norator

CurrentMirror

VoltageMirror

Miscellaneous

Breaker

Crystal

CPE

Josephson

Josephson(box=True)

Motor

Lamp

Lamp2

Neon

Thermistor

Memristor

Memristor2

Jack

Plug

Terminal

SparkGap

Sources and Meters

Source

SourceV

SourceI

SourceSin

SourcePulse

SourceSquare

SourceTriangle

SourceRamp

SourceControlled

SourceControlledI

SourceControlledV

BatteryCell

Battery

MeterV

MeterA

MeterI

MeterOhm

Solar

Switches

Button

Button(nc=True)

Switch

Switch(action=’open’)

Switch(action=’close’)

SwitchReed

Lines and Arrows

Line

Arrow

Arrow(double=True)

DataBusLine

Also see Connecting Elements.

Single-Terminal

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

Power and Ground

Ground

GroundSignal

GroundChassis

Vss

Vdd

Antennas

Antenna

AntennaLoop

AntennaLoop2

Connection Dots

Dot

Dot(open=True)

DotDotDot

Arrowhead

NoConnect

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.

SwitchSpdt

SwitchSpdt2

SwitchSpdt(action=’open’)

SwitchSpdt2(action=’open’)

SwitchSpdt(action=’close’)

SwitchSpdt2(action=’close’)

Double-pole

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

SwitchDpst

SwitchDpdt

SwitchDpst(link=False)

SwitchDpdt(link=False)

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.

SwitchRotary(n=6)

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.

SwitchDIP

SwitchDIP(pattern=[0, 0, 1])

Audio Elements

Speakers, Microphones, Jacks

Speaker

Mic

AudioJack

AudioJack(ring=True)

AudioJack(switch=True)

AudioJack(switch=True, ring=True, ringswitch=True)

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.

Gap(label=[‘+’, ‘Gap’, ‘-‘])

Label(label=’Hello’)

Tag(label=’Tag’)

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.

Opamp

Opamp(sign=False)

Opamp(leads=True)

Transistors

Bipolar Junction Transistors

Bjt

BjtNpn

BjtPnp

Bjt(circle=True)

BjtNpn(circle=True)

BjtPnp(circle=True)

BjtPnp2c

BjtPnp2c(circle=True)

NpnSchottky

PnpSchottky

IgbtN

IgbtP

NpnPhoto

PnpPhoto

Field-Effect Transistors

NFet

PFet

NFet(bulk=True)

PFet(bulk=True)

JFet

JFetN

JFetP

JFetN(circle=True)

JFetP(circle=True)

Hemt

Hemt(split=False)

Hemt(arrow=False)

NMos

PMos

NMos(diode=True)

PMos(diode=True)

NMos(circle=True)

PMos(circle=True)

AnalogNFet

AnalogPFet

AnalogBiasedFet

AnalogNFet(bulk=True)

AnalogPFet(bulk=True)

AnalogBiasedFet(bluk=True)

AnalogBiasedFet(arrow=False)

AnalogPFet(arrow=False)

AnalogBiasedFet(arrow=False)

AnalogNFet(offset_gate=False)

AnalogPFet(offset_gate=False)

AnalogBiasedFet(offset_gate=False)

“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.

BjtNpn2

BjtPnp2

BjtPnp2c2

NFet2

PFet2

JFetN2

JFetP2

NMos2(diode=True)

PMos2(diode=True)

NMos2(circle=True)

PMos2(circle=True)

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.

TwoPort

TwoPort(terminals=False, boxlw=3)

Generic

TwoPort

TwoPort(reverse_output=True)

TwoPort(arrow=False)

TwoPort(sign=False)

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.

VoltageTransactor

TransimpedanceTransactor

TransadmittanceTransactor

CurrentTransactor

Pathological

Nullor

VMCMPair

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.

elm.ElementTwoport(
    input_element=elm.Inductor2,
    output_element=elm.SwitchReed,
    unit=2.5, width=2.5)

elm.ElementTwoport(
    input_element=elm.Lamp,
    output_element=partial(elm.Photodiode, reverse=True, flip=True),
    width=3)

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.

Coax

Triax()

Coax(length=5, radius=0.5)

Triax(length=5, radiusinner=0.5)

CoaxConnect

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.

Transformer

Transformer(loop=True)

Transformer(core=False)

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(fontsize=10) as d:
    x = elm.Transformer(t1=4, t2=8).tap(name='B', pos=3, side='secondary')
    elm.Line().at(x.s1).length(d.unit/4).label('s1', 'rgt').color('blue')
    elm.Line().at(x.s2).length(d.unit/4).label('s2', 'rgt').color('blue')
    elm.Line().at(x.p1).length(d.unit/4).left().label('p1', 'lft').color('blue')
    elm.Line().at(x.p2).length(d.unit/4).left().label('p2', 'lft').color('blue')
    elm.Line().at(x.B).length(d.unit/4).right().label('B', 'rgt').color('blue')