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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!

Light Emitting Diode (LED) Circuits
Master Category List   --  Dave's Circuits

Circuits Designed by David Johnson, P.E. :

LED Flashing Badge #1

LED Flashing Badge #2

LED Lighthouse Flasher

LED Lighthouse Flasher for HO Model Train 

LED Pilot Light powered by AC Line




Lighthouse LED Flasher


Line Powered High Intensity LED Flasher

Line Powered White LED Array

Line Status Indicator for 1 Telephone Line

Low Current Flashing LED Power Indicator

Low Pass Filter, 3Khz, with an Audio Amp

Low Power LED Flasher

Low Power Sequential Flasher using 10 LEDs

Low Power Universal LED Flasher


Miniature Lighthouse Light Simulator

Model Airplane Wing Tip Flasher

Model Train Lighthouse Flasher Revisited

Modified 4 D Cell LED Lantern

Modified Colman Lantern3

Modified LED Night Light

Negative 0.5 Volt Supply

Night Light from White LED


Nine-Volt Battery Voltage Monitor

On/off Pushbutton Switch with 30 Minute Timeout

One NiMH
Cell powers White LED

One-Line Telephone Line Status Indicator

One-Watt White LED Night Light


Plus & Minus DC Power Supply

Pot Controlled Variable LED Intensity Circuit

Power Supply-24 Volts AC to 24 Volts DC

Pulsed LED Test Circuit

Pushbutton Controlled Up/Down Ramping Light

PV Solar Cell Test Fixture

Radio Tower Lamp Monitor

Ramping Lamp Driver

Ramping LED Driver

Reduced Power Sequential LED Flasher

Remote LED Indicator Light

Revisited-Model Train Lighthouse Flasher

Safety Light

Shop Safety Light

Simple Circuit for White LED Night Light

Simple Circuit Negative Supply Circuit

Solar 1w Cob LED Light

Solar Fireflies In Jar Light

Solar Powered Flood Light using NiMH

Solar Powered Infrared 1W Security Camera Illuminator

Solar Powered Lighthouse

Solar Powered Mason Jar Light

Solid State Relay that is Bidirectional

Sound Triggered Night Light

Super Bright 3v Powered LED Flasher

Table Lamp with Auxiliary 12v Automotive Style LED Light

Ten-LED Sequential Flasher using Low Powr

Tester for Pulsed LEDs

Three Volt Universal LED Flasher

Three-Minute Closet Light

Three-Volt Low Battery Voltage Flasher

Three-Volt Powered Super Bright LED Flasher

Tool Shed LED Light

Transmit to a Remote LED Indictor Light


Ultra Low Current 3v LED Flasher #6

Ultra Low Power LED Flasher

Universal LED Flasher


Up/Down Ramping Light Pushbutton Control

Version a of 1.5v LED Flasher

Voltage Monitor for a 9v Battery

Voltage to Frequency Converter 1us LED Pulse Driver

Well Pump Flasher & Beeper

White LED Array that is Lined Powered

White LED Driver powered by a 3v Battery

White LED is Powered By One NiMH

White LED Night Light

White LEDs powered by 24V

Wig/Wag LED Flasher

Wireless LED Flasher
0.5v Negative Supply

1 Line Telephone Line Status Indicator

1.5v LED Flasher Version A

10 LED Sequential Flasher using Low Powr

120 VAC / 240 VAC Indicator


Cell powers White LED

1us LED Pulse Driver Voltage to Frequency Converter

1W Solar Path Light with COB

1W White LED Night Light

20 LED Night Light

24 Volts AC to 24 Volts DC Power Supply

24V DC Powered Beeper with 4 Separate Inputs

3 Minute LED Closet Light

30 LED Night Light

3-Minute Closet Light

3-Minute Closet Light #2

3v Battery Powered White LED Driver

3v Powered Super Bright LED Flasher

3v Universal LED Flasher

4 to 20ma Current Loop Senses Temperature


8 Solar Cell LED Light

9v Battery Voltage Monitor

AC Line Powered LED Flasher

AC Line Powered LED Pilot Light

AC Power Loss Alarm

Active AC Power Line Indicator

Advertising Badge #1 with Flashing LED

Advertising Badge #2 with Flashing LED

AIR Transparency Monitor, Xenon Flash Transmitter

Auxiliary 12v Automotive Style LED Light Makes Table Lamp

Battery Charge Current Indicator

Battery Free LED Flasher

Bidirectional Solid State Relay

Charging a 24v Battery Charger from a 12v Source

Circuit Indicates Battery Charge Current

Circuit indicates Battery Charging Current

Classic Linear 5v Supply using 6.3VAC Transformer

Closet Light with Automatic 3-Minute Timeout



Computer Controlled PWM Circuit

Computer, Long Period, Watch Dog Timer

Constant Current Drives LEDs

Constant Current LED Driver

Control Variable LED Intensity

Controlled Up/Down Ramping Light

Convert Solar Powered Light to Flasher

Current Indicator for Battery Chargers

Does Power Line have 120 VAC or 240 VAC?

Drive a LED with an Intensity Ramping Mode

Either Indicates 120 VAC or 240 VAC 

Fake TV Camera Flasher



Flashing LED Advertising Badge #1

Flashing LED Power Indicator

Flashing Light to simulate Car Alarm

Generate 0.5v Negative Supply

High Intensity Line Powered LED Flasher

High Power LED Flasher

HO Model Train Lighthouse Flasher

HO Train Lighthouse Flasher Revisited

Hot AC Power Line Indicator

Improved Solar LED Spot Light

Increased power for LED Flasher

Indicates 120 VAC or 240 VAC

Indicates Battery Charge Current

Inductive Pulse Receiver (175Khz)

IR Remote LED Indicator Light

LED Array powered by 24 VAC

LED Camping Lantern with Dimmer

LED Driver using Constant Current

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

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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