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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, October 24, 2017 03:04 PM

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

Control Circuits

Circuits Designed by David Johnson, P.E. :

LED Camping Lantern with Dimmer

LED Driver-Wireless

LED Flasher needs only 1.5 VOLTS

LED Flasher that is Battery Free

LED Flasher Universal 3v

LED Flasher-Wig/Wag

LED Flasher-Wireless Circuit

LED Flashing Badge #1

LED Flashing Badge #2

LED Lighthouse Flasher

LED Lighthouse Flasher for HO Model Train

LED Strings powered by AC Line

LED Test Signal Generator-40Khz

Light to Frequency Converter

Light/Dark 12V Switch

Lighthouse LED Flasher

Line Powered High Intensity LED Flasher

Line Powered White LED Array

Line-Powered Xenon Flash Transmitter

Logic Controlled 12v DC Motor with Automatic Brake

Low Battery Voltage Flasher

Low Current Flashing LED Power Indicator

Low Power H Bridge Motor Controller

Low Power LED Flasher

Low Power Sequential Flasher using 10 LEDs

Low Power Universal LED Flasher

Low Voltage 120vAC Power Line Alarm

Low Voltage Latch Circuit

Micro Power Over-Temperature Alarm

Model Airplane Wing Tip Flasher

Model Train Lighthouse Flasher Revisited

Modified LED Night Light

Momentary Touch Activated Switch

Monitor ON/OFF status of a Remote Switch

Night Light from White LED

One-Watt White LED Night Light

Optical Filter using Color Film Negative

Over-Temperature Micro-Power Alarm

Pot Controlled Variable LED Intensity Circuit

Power Line Alarm

Protects from Battery Polarity Reversal

Pushbutton Activates Service Request Beeper

Pushbutton Controlled Up/Down Ramping Light

PWM Circuit for Motor Speed Control

PWM Motor Controller uses a 555 Timer

Ramping Lamp Driver

Ramping LED Driver

Rapidly Stops DC Motor Drive

Reduced Power Sequential LED Flasher

Remote Extender Circuit

Remote Range Extender TV/VCR

Remote Relay Driver

Remote TV Camera Power

Replace a Pushbutton Switch with this Infrared Safety Switch

Safety Light

Service Request Beeper

Servo Pulse to Voltage Converter

Shadow activated (or hand wave) Motion Detector

Shop Safety Light

Simple Circuit for White LED Night Light

Solar-Powered Pump Motor Controller

Solid State Relay Requires Only 50ua Drive Current

Sound Triggered Night Light

SSR Requires Ultra Low Control Current

Super Bright 3v Powered LED Flasher

Switch Detects Audio Signal

Ten-LED Sequential Flasher using Low Powr

Thermostat for 12v Cooling Fan

Three Volt Universal LED Flasher

Three-Minute Closet Light

Three-Volt Low Battery Voltage Flasher

Three-Volt Powered Super Bright LED Flasher

Touch Activated Switch

Transistor-Switch Detects Audio Signal

Transmitter for Line Powered Xenon Flash

TV /VCR Remote Range Extender Circuit

TV-VCR Light Source 40Khz Repeater

Two Pushbutton Motor Controller

Ultra Low Current 3v LED Flasher #3

Ultra Low Current Oscillator

Under/Over Voltage Alarm on AC Line

Universal Flasher using a Latching Relay

Universal LED Flasher


Up/Down Ramping Light Pushbutton Control

Version a of 1.5v LED Flasher

Water Filling Station Controller

Water Pump controlled by Solar Power

White LED Array that is Lined Powered

Wig/Wag LED Flasher

Wireless LED Flasher

Xenon Lamp Flash Detector Amplifier

Xenon Photoflash Controller

1 Watt Fluorescent Lamp Night Light

1.5v LED Flasher Version A

1.5V Touch Activated Switch

10 LED Sequential Flasher using Low Powr

12 Volt Lite/Dark Lamp Switch

120 VAC Low Voltage Alarm

12v Brush Motor Speed Controller

12v Cooling Fan Thermostat

12v DC Motor with Logic Controlled Automatic Brake

12v Light/Dark Lamp Switch

12v Touch Switch Exciter Circuit

14v LED AuxiliaryLamp with a 60 Watt Lamp

1W White LED Night Light

2 Pushbutton Motor Controller

3 Minute LED Closet Light

3 Volt Low Battery Voltage Flasher

3-Minute Closet Light

3-Minute Closet Light #2

3v Powered Super Bright LED Flasher

3v Universal LED Flasher

40Khz LED Test Signal Generator

40khz TV-VCR Light Source Repeater

50ua Current Drives Solid State Relay Requires Only

555 Timer Forms Simple Circuit PWM Motor Controller

5w Fluorescent Lamp Intensity Modulator

60 Watt Lamp with Auxiliary 14v LED Lamp

6V to 24V DC Day/Night Switch

9v Powered Xenon Photoflash Controller

AC Current Controls Hour Meter

AC Line Powered LED Flasher

AC Line Under/Over Voltage Alarm

AC Power Line High/Low Voltage Tester

AC Power Loss Alarm

Advertising Badge #1 with Flashing LED

Advertising Badge #2 with Flashing LED

Alarm Sounds At Freezing Temperatures

Alternating CW & CCW Motor Driver

Amplifier for a Xenon Lamp Flash Detector

Audio Activated Switch

Audio Frequency Digital Noise Generator

Automatic DC Motor Brake

Battery Free LED Flasher

Battery-Powered Freezer Alarm

Battery-Powered LED Flashing Advertising #2

Bi-Directional Charge Coupled Powers MOSFET Relay

Boost Infrared TV/VCR Remote Signal

Brush Motor Speed 12V Controller

Capacitance Touch Switch

Characteristics of CMOS Logic Inverter Amplifiers

Charge Coupled Bi-Directional Power MOSFET Relay

Circuit Protects from Battery Polarity Reversal

Classic Linear 5v Supply using 6.3VAC Transformer

Closet Light with Automatic 3-Minute Timeout


Computer Controlled PWM Circuit

Control Variable LED Intensity

Controlled Up/Down Ramping Light

Controller for a 9v Powered Xenon Photoflash

Convert Solar Powered Light to Flasher

Cooling Fan Thermostat (12v)

CT Hour Meter

CW & CCW Alternating Motor Driver

Dark Activated 12v Power Supply Switch

Detect Short Xenon Lamp Flashes

Detector/Switch for Audio Signal

Detects Low Voltage 120VAC Power Line

Detects Xenon Lamp Flash

Digital noise generator

Drive a LED with an Intensity Ramping Mode

Five-Watt Fluorescent Lamp Intensity Modulator

Flashing LED Advertising Badge #1

Flashing LED Power Indicator

Fluorescent Lamp Intensity Modulator

Fluorescent Lamp Night Light Needs Only 1 Watt

Freeze Alarm

Freezer Over-Temperature Alarm

Freezing Temperature Alarm

High Intensity Line Powered LED Flasher

High Power LED Flasher

HO Model Train Lighthouse Flasher

HO Train Lighthouse Flasher Revisited

Incandescent Lamp Inrush Current Limiter

Increased power for LED Flasher

Infrared Remote Extender Circuit

Infrared Safety Switch

Infrared TV/VCR Remote Booster

IR TV/VCR Remote Booster

Isolated Remote Switch Circuit


Hobby Circuits by Category

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



Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

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