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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 23, 2012 08:58 AM

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AC Power Control
AC to AC Converters
AC to AC Power Supply
AC to DC Power Supply


Active Filters:
  Band Pass
  High Pass
  Low Pass
  Notch

Acquisition / Data Logging

 Amplifiers:
  Buffers
  High Frequency
  High Impedance
  High Speed
  Low Noise  
  RF (Radio Frequency)
  Transimpedance
  Variable Gain
  Wide Band

Alarm
Annunciator
Astable Oscillator

Audio Accessories
Audio Amplifiers
Audio Oscillator
Automotive

Band Pass Active Filters
Battery Chargers
Battery Monitor
Battery Tester
Beepers & Buzzers
Bistable Multivibrator
Blinkers
Buffer Amplifiers
Burglar
Capacitance Touch Switch
Capacitance Sensors
Charge Pump

Clock
Comparator
Crystal Oscillators
Control
Constant Current
 


 

 Converters:
  AC to AC
  AC to DC
  Current to Voltage
  DC to AC
  DC to DC
  Frequency-Voltage
  Period to Voltage
  Sine-Square Wave
  Switchmode
  Voltage
  Voltage-Frequency

Counters & Timers
Current to Voltage Converters
Current Loop
Current Monitors
Current Source
Data Logging / Acquisition
DC to DC Power Supplies
Delay
Digital
Driver
Discriminator
Display
Doorbell

FET
Fiber Optic
Flashers & Blinkers
Flip / Flop
Fluid Level Detectors
Fluorescent Light
Flyback
Freespace Communication
Freezer / Frost Alarm
Frequency Dividers
Frequency-Voltage Converters

 Gadgets
Geophones

H-Bridge
High Frequency Amplifiers
High Impedance Amplifier
High Pass Active Filters
High Speed Amplifiers
High Voltage Power Supplies
Hour Meter
Human Motion Monitors
Human Proximity Sensors
Human Touch

Indicator
Infrared
Inverters

 

 Lamp / Lighting Controls
Laser
Latch
LED (Light Emitting Diode)
Light Beam Communication
Light Dependent Resistors
Light Detectors
Light Flashing
Limiter
Low Noise Amplifiers
Low Pass Active Filters
Microphone
Micro Power
Miscellaneous
Models
Moisture Sensors
Monostable
MOSFET
Motion Detectors
Motor Controls
Multivibrator

Noise Generators
Notch Active Filters

One Shot
Opto-Isolator
Optic Fiber
Optical Sensors

Oscillators:
  Astable
  Audio
  Crystal
  Radio Frequency
  Sine Wave
  Square Wave
  Triangle Wave
  Voltage Controlled

Over Temperature Monitors

PWM
Peak Detectors
Period to Voltage Converters
Pink Noise Generation
Piezoelectric
Photography
Photo Flash

 Position Detectors
Potentiometer
Power Control
Power Failure
Power Line

Power Supplies:
  AC to AC
  AC to DC
  DC to AC
  DC to DC
  High Voltage
  Switchmode
  Variable

Probes
Protection
Pulse Generation
Pulse Width Modulators
Push Pull
RFID

Radio Frequency:
  Amplifiers
  Detectors
  Oscillators
  Receivers
  Transmitters

Receiver
Rectifier
Relay
Remote Control
Resistance Meters
RF Amplifiers
RF Detectors
RF Oscillators
RF Receivers
RF Transmitters		 SCR
Sample & Hold
Safety/Protection
Security
Seismic

Sensors/Detectors: 
  Automotive
  Capacitance
  Current Monitors
  Human Motion
  Light and Optical
  Liquid sensors
  Motion Detectors
  Peak Detectors
  Position Detectors
  Resistance Meters
  Seismic (Geophones)
  Temperature
  Vibration Monitors
  Voltage Detectors
  Water / Moisture 		Signal Generators
Silicon Controlled Rectifier
Sine Wave Oscillators
Sine to Square Wave Converter
Siren Circuits
Solar
Solar Energy Monitors
Solid State Relay
Sound Operated
Square Wave Oscillators
Sweep
Switches
Switch Mode Power Supplies
Switch Regulators
Super Capacitor Circuits
Sync Circuits
Telephone
Television
Temperature Alarms
Temperature Sensors/Monitors
Tester
Timers & Counters
Touch Switch
TRIAC
Traffic Counter
Train Models
Transformer
Transimpedance Amplifiers
Transistor
Transmitter
Thermistor
Thermocoupler
Triangle Wave Generators
TV Remote Control		 UHF (Ultra High Frequency)
Ultrasonic
Ultrasound
Under Voltage Monitors

VCO
Variable Power Supplies
Vibration Monitors
Voltage Comparators
Voltage Converters
Voltage Controlled Oscillators
Voltage Detectors
Voltage Monitors
Voltage Regulators
Voltage-Frequency Converters		 Water Sensors
Watt Hour Meters
Waveform Generator
Wave Shaping
Wide Band Amplifiers
White Noise Generation
Wireless Telephones

Xenon Lamps
Zero Cross Detectors

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