74 templates
Circuit schematic templates
Native electrical schematic capture. Declare components (resistor, capacitor, inductor, diode, LED, transistor, op-amp, source, ground, switch, junction) at grid coordinates with values, then wire them together. Renders with standard IEC / ANSI-style symbols and labelled values. Ideal for textbook circuits, lab notes, and small-design documentation; not a substitute for KiCad on a real PCB.
Circuit — RC low-pass filter
First-order RC low-pass with input source and ground.
Chemistry & PhysicsCircuit — LED with current limiter
Resistor + LED powered from 5 V with ground return.
Chemistry & PhysicsCircuit — voltage divider
Two-resistor divider with output tap.
Chemistry & PhysicsCircuit — op-amp inverting amplifier
Single-supply inverting amplifier with feedback resistor.
Chemistry & PhysicsCircuit — NPN switch with base resistor
Classic NPN transistor as a low-side switch.
Chemistry & PhysicsPhysics — Circuit: RL series
Resistor and inductor in series across a DC source.
Chemistry & PhysicsPhysics — Circuit: series RLC
A resonant series R-L-C loop driven by a source.
Chemistry & PhysicsPhysics — Circuit: Wheatstone bridge
Four-resistor bridge with a galvanometer branch.
Chemistry & PhysicsPhysics — Circuit: parallel resistors
Two resistors in parallel across a battery.
Chemistry & PhysicsPhysics — Circuit: transistor switch
An NPN transistor switching an LED via a base resistor.
Chemistry & PhysicsPhysics — Circuit: half-wave rectifier
A diode passing only one half-cycle to a load.
Chemistry & PhysicsPhysics — Circuit: full-wave bridge rectifier
Four diodes rectifying both halves of an AC cycle.
Chemistry & PhysicsPhysics — Circuit: RC integrator
Series resistor with a capacitor to ground — an RC integrator.
Chemistry & PhysicsPhysics — Circuit: switched lamp
A cell, switch and lamp (modelled as a resistor) in series.
Chemistry & PhysicsPhysics — Circuit: parallel LEDs
Two current-limited LEDs in parallel across a supply.
Chemistry & PhysicsPhysics — Circuit: RC differentiator
Series capacitor with a resistor to ground.
Chemistry & PhysicsPhysics — Circuit: cells in series
Two cells in series driving a resistor.
Chemistry & PhysicsPhysics — Circuit: common-emitter amplifier
A biased NPN transistor amplifier stage.
Chemistry & PhysicsPhysics — Circuit: thermistor sensor
A potential divider using a thermistor.
Chemistry & PhysicsEngineering — Circuit: rectifier with smoothing
A diode rectifier with a smoothing capacitor.
Chemistry & PhysicsEngineering — Circuit: Darlington pair
Two transistors giving very high current gain.
Chemistry & PhysicsPhysics — Circuit: voltage divider
Two resistors set an output fraction of the supply.
Chemistry & PhysicsPhysics — Circuit: LED with series resistor
A current-limiting resistor protects an LED.
Chemistry & PhysicsPhysics — Circuit: RC low-pass filter
A resistor and capacitor attenuate high frequencies.
Chemistry & PhysicsPhysics — Circuit: RC high-pass filter
Swapping R and C passes high frequencies instead.
Chemistry & PhysicsPhysics — Circuit: inverting amplifier
An op-amp with feedback sets a negative gain.
Chemistry & PhysicsPhysics — Circuit: non-inverting amplifier
Feedback to the inverting input sets a gain above one.
Chemistry & PhysicsPhysics — Circuit: Zener regulator
A reverse-biased Zener diode clamps the output voltage.
Chemistry & PhysicsPhysics — Circuit: capacitor charging
Closing the switch charges C through R (RC transient).
Chemistry & PhysicsPhysics — Circuit: voltage doubler
A diode-capacitor network that roughly doubles peak voltage.
Chemistry & PhysicsPhysics — Circuit: push-pull output stage
Complementary transistors drive a load (class B).
Chemistry & PhysicsPhysics — Circuit: diode clipper
A diode limits the output swing above a threshold.
Chemistry & PhysicsPhysics — Circuit: photodiode amplifier
A transimpedance amplifier converts photocurrent to voltage.
Chemistry & PhysicsPhysics — Circuit: summing amplifier
An op-amp adds two weighted input voltages.
Chemistry & PhysicsPhysics — Circuit: op-amp comparator
Compares an input against a reference voltage.
Chemistry & PhysicsPhysics — Circuit: transistor relay driver
A transistor switches a relay coil with a flyback diode.
Chemistry & PhysicsPhysics — Circuit: constant current source
A transistor and emitter resistor set a steady current.
Chemistry & PhysicsPhysics — Circuit: Schmitt trigger
Positive feedback gives the comparator hysteresis.
Chemistry & PhysicsPhysics — Circuit: active low-pass filter
A Sallen-Key second-order low-pass filter.
Chemistry & PhysicsPhysics — Circuit: peak detector
A diode charges a capacitor to the input's peak voltage.
Chemistry & PhysicsPhysics — Circuit: Wien bridge oscillator
An RC network sets a sine-wave oscillation frequency.
Chemistry & PhysicsPhysics — Circuit: op-amp integrator
A feedback capacitor integrates the input over time.
Chemistry & PhysicsPhysics — Circuit: instrumentation amplifier
Three op-amps give high-gain differential measurement.
Chemistry & PhysicsPhysics — Circuit: precision rectifier
An op-amp removes the diode drop for small signals.
Chemistry & PhysicsPhysics — Circuit: current mirror
Two matched transistors copy a reference current.
Chemistry & PhysicsPhysics — Circuit: emitter follower
A common-collector stage with unity voltage gain.
Chemistry & PhysicsPhysics — Circuit: differential pair
A long-tailed pair amplifies the difference of two inputs.
Chemistry & PhysicsPhysics — Circuit: cascode amplifier
Stacked transistors for high bandwidth and gain.
Chemistry & PhysicsPhysics — Circuit: common-base amplifier
Input at the emitter, output at the collector.
Chemistry & PhysicsPhysics — Circuit: RC band-pass filter
A high-pass and low-pass stage in series.
Chemistry & PhysicsPhysics — Circuit: twin-T notch filter
A twin-T network rejects one frequency.
Chemistry & PhysicsPhysics — Circuit: Pierce crystal oscillator
A quartz crystal sets a precise frequency.
Chemistry & PhysicsPhysics — Circuit: Dickson charge pump
Diodes and capacitors multiply a voltage.
Chemistry & PhysicsPhysics — LED with Series Resistor
A current-limiting resistor protects the LED.
Chemistry & PhysicsPhysics — RL Series Circuit
A resistor and inductor driven by a source.
Chemistry & PhysicsPhysics — RC Charging Circuit
A capacitor charges through a resistor when the switch closes.
Chemistry & PhysicsPhysics — LC Tank Circuit
A parallel inductor and capacitor resonate.
Chemistry & PhysicsPhysics — Potential Divider
Two series resistors set the output voltage.
Chemistry & PhysicsPhysics — Half-Wave Rectifier
A diode passes only the positive half-cycles.
Chemistry & PhysicsPhysics — Two Lamps in Parallel
Each lamp gets the full supply voltage.
Chemistry & PhysicsPhysics — Three Resistors in Series
Series resistances add to give the total.
Chemistry & PhysicsPhysics — Two Lamps in Series
Lamps share the supply voltage between them.
Chemistry & PhysicsPhysics — RC Discharge Circuit
A charged capacitor discharges through a resistor.
Chemistry & PhysicsPhysics — Two Cells in Series
Cell EMFs add to drive a lamp.
Chemistry & PhysicsPhysics — LDR Light Sensor
A potential divider with a light-dependent resistor.
Chemistry & PhysicsPhysics — Diode Clipper
A diode limits the output voltage swing.
Chemistry & PhysicsPhysics — Capacitors in Parallel
Parallel capacitances add.
Chemistry & PhysicsPhysics — Traffic-Light LEDs
Three LEDs in parallel across a supply.
Chemistry & PhysicsPhysics — Inductors in Series
Series inductances add.
Chemistry & PhysicsPhysics — Potentiometer
A wiper taps a variable fraction of the voltage.
Chemistry & PhysicsPhysics — NTC Thermistor Sensor
Resistance falls as temperature rises.
Chemistry & PhysicsPhysics — Fuse Protecting a Lamp
A fuse breaks the circuit if the current is too high.
Chemistry & PhysicsPhysics — RC Coupling (AC Coupling)
A series capacitor blocks DC and passes AC.
Chemistry & PhysicsPhysics — Resistor and Inductor in Parallel
An R and L sharing the same two nodes.
Chemistry & Physics