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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, December 29, 2017 02:53 AM

List of Dave's Circuit Designs

Text & Graphics Copyright David A. Johnson, PE  --  ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY CONTENT to your WEB SITE server!




Micro Power Circuits
Circuits Designed by Dave Johnson, P.E. :

Infrared Safety Switch

LED Flashing Badge #1

LED Flashing Badge #2

Light Detector with High Ambient Light Immunity

Light/Dark Activated Motion Detector

Low Battery Voltage Flasher

Low Frequency Oscillator draws only 2 Nanoamps

Low Power 40KHz Light Detector

Low-power optical interrupter

Machine Vibration Triggers Hour Meter

Micro Power 40Khz Burst Laser Diode Driver

Micro Power Over-Temperature Alarm

Micropower CMOS Oscillator, Draws Only 0.5ua

Micropower Pulse Generator

Monitors Pump Motor

Motion Alarm using piezo Device

Nine-Volt Battery Eliminator

Nine-Volt Battery Voltage Monitor

One-Line Telephone Line Status Indicator

Optical Interrupter Draws Microamps

Pop Free Microphone On/Off Switch Circuit

Precision Fullwave Rectifier

Precision Ultra Lower Power Oscillator

Pump Motor Monitor

Simple Circuit Wire Security Loop Alarm

Solid State Relay Requires Only 50ua Drive Current

Supercapacitor Voltage Limiting Circuit

Switch Detects Audio Signal

Ten-Second Ultra Lower Power Oscillator

Thermocouple Temperature Activates Relay

Touch Activated Switch

Two Transistor Oscillators

Ultra Low Current Oscillator

Ultra Low Power Latching Relay Circuit

Ultra Lower Power Oscillator

Version a of 1.5v LED Flasher

Very Loud 3v Powered Beeper

1 Line Telephone Line Status Indicator

1.5v LED Flasher Version A

1.5V Touch Activated Switch

10 Second Ultra Lower Power Oscillator

12v Touch Switch Exciter Circuit

2 Transistor Oscillators

3 Volt Low Battery Voltage Flasher

32Khz Ultra Low Power Crystal Oscillator

3v 2hz Oscillator

3v Powered Loud Beeper

40Khz Light Detector with High Ambient Light Immunity

9v Battery Eliminator

9v Battery Voltage Monitor

9V Pulse Generator

Advertising Badge #1 with Flashing LED

Advertising Badge #2 with Flashing LED

Alarm-Piezo Device Detects Motion

Audio Activated Switch

Battery Eliminator

Battery Free LED Flasher

Charge Pump Efficiently Divides Supply Voltage 

Circuit Forms Ideal Diode Function

Clear Fluid Monitor

Detects Shadow Activated Motion

Door Knob Alarm

Door Knock Beeper

Freeze Alarm

Freezer Over-Temperature Alarm

Freezing Temperature Alarm


 

Dave's Circuits

Hobby Circuits

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  David A. Johnson, P.E. about these circuits

 


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