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Circuits
At least version 3.6 of the app is needed to read all these circuits. The description and notes about circuits can be found at the bottom of circuit pages. After downloading circuits, they should be copied into the Circuits directory of the app.
Note: these circuits can also be downloaded directly in the app (Menu -> Web Circuits).
DC Circuits
- Simple resistor circuit
- Series resistors
- Parallel resistors
- Series-parallel resistors
- Circuit for network analysis
- RC series circuit
- RL series circuit
- Wheatstone bridge
- Unbalanced bridge
- Circuit for node voltage method
- Wheatstone bridge and current
- Ground symbol
- Current in a series circuit
- Voltage drops in a series circuit
- Series LR circuit with DC source
- Voltage in parallel circuit
- Current in parallel circuit
- Series-parallel circuit with short
Measurement Circuits
- NPN transistor characteristics
- nMOSFET ID-VDS characteristics
- nMOSFET ID-VGS characteristics
- nJFET ID-VDS characteristics
- nJFET ID-VGS characteristics
- Measuring transistor beta
- Cheap transistor beta meter
- Tunnel diode I-V characteristics
- SCR trigger current measurement
- AC/DC microammeter
- LED decibel meter
- VO14642 SSR test
- Pulse width to voltage converter
- I/V-curve tester
- Matching of diodes
Transistor Circuits
- NPN transistor switch
- Voltage divider bias
- Current mirror
- Transistor peak detector
- Dual relay driver
- Basic logic gate with transistors
- JFET variable resistor
- BJT differential amplifier
- BJT zero gain amplifier
- MOS zero gain amplifier
- MOS differential pair
- CMOS inverter
- CMOS amplifier
- MOS source follower
- Lambda diode
Transistor Circuits 2
- The basic transistor amplifier (NPN version)
- The basic transistor amplifier (PNP version)
- Self-bias
- Combination bias
- Testing transistor gain
- Testing transistor leakage
- Transistor as a switch
- JFET common-source amplifier
- Biasing a common emitter amplifier
- Positive clipper
- Ultrafast sampling switch
- Transistor power switch
Operational Amplifier Circuits
- Instrumentation amplifier
- Integrator
- Differentiator
- Voltage to current converter
- Constant current using opamp
- OPAMP from transistors
- Noninverting summer
- Inverting summer
- Voltage comparator
- Op-amp full-wave rectifier
- Howland current source
- T-network amplifier
- Precision voltage divider
- Push-pull transistor output boost
- Programmable gain amplifier
- Opamp comparator with hysteresis
- Non-inverting amplifier bandwidth
- Inverting amplifier bandwidth
Digital Circuits
- 3-bit binary counter
- 4-bit asynchronous counter
- Binary synchronous up counter
- SISO shift register
- NOR gate S-R latch
- NAND gate function
- TTL inverter
- TTL NAND gate
- NAND gate in CMOS logic
- NOR gate in CMOS logic
- Switch-based inverter
- NAND gate using switches
- Simple combination lock
- 7-segment display
- Single digit counter
- Half adder
- Full adder
- 1-of-4 decoder
- 1-of-4 decoder - block diagram
- 74164: Output voltages
Miscellaneous Amplifiers
- Transistor audio amplifier
- Cascode amplifier
- Common-emitter amplifier
- Common-collector amplifier
- Common-base amplifier
- Class B audio amplifier
- Voltage controlled amplifier using transistor
- Transformer coupled amplifier
- Common-emitter tuned amplifier
- Tuned differential amplifier
- Transistor differential amplifier
- Single stage MOSFET amplifier
- Complementary symmetry amplifier with diodes
- Transistor amplifier with feedback
- Impedance matching line driver
Misc Oscillators and Multivibrators
- Monostable flip flop with inverters
- Astable multivibrator
- Bistable multivibrator
- 555 timer LED flasher
- 555 ramp generator
- 555 hysteretic oscillator
- 555 monostable multivibrator
- Common-base Colpitts oscillator
- Common-base Colpitts oscillator 2
- Colpitts crystal oscillator
- Opamp Wien bridge oscillator
- Tunnel diode oscillator
- Pulsed oscillator
- Twin-T oscillator
- Armstrong oscillator
- Monostable multivibrator with 74121
Basic Power Supplies
- Voltage tripler
- Voltage quadrupler
- JFET current regulator
- Constant-current diode
- PWM power controller
- Full-wave bridge rectifier
- Full-wave rectifier using center tap transformer
- Rectifier and filter
- Tube power supply
- LM317 voltage regulator
- LM317 current regulator
- Simple DC to DC converter
- Generating -5 volts from 9 volts
- Opamp regulator with series-pass transistor
- NPN transistor voltage regulator
- PNP transistor voltage regulator
Linear Power Supplies
- 5V from old cells
- 7.5V uninterruptible power supply
- How discrete voltage regulator with current limiter works
- LED based voltage regulator
- High power car voltage regulator
- Zener-diode regulated power supply
- 150-volt series regulator
- Supply for amplifier timer
- LM317 regulator with pass transistor
- Efficient regulated power supply
- 0V to 30V regulator
- Dual-rail power supply
- High-current adjustable regulator
- Transistor current regulator
Testers and Detectors
- 741 tester
- Mains voltage sensor
- AC line current detector
- AC current monitor
- AC current monitor 2
- Static charge monitor
- Lightning strike detection
- Circuit board tester
- Room noise detector
- Infra-red level detector
- Voltage to pulse width converter
- Zero phase shift indicator
- Smoothly adjustable DC load
- Peak/average detector