Circuit - Circuits designed by David A. Johnson, P.E.

Circuits designed by David Johnson, P.E.
Last Updated on: Friday, November 17, 2017 06:32 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
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:
Current to Voltage
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
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

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
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:

Capacitance
Current Monitors
Human Motion
Light and Optical
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
Solar
Solar Energy Monitors NEW
Solid State Relay
Sound Operated
Square Wave Oscillators
Switch
Switch Mode Power Supplies
Sync Circuits

Telephone
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

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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