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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, June 01, 2021 03:22 PM

Text & Graphics Copyright David A. Johnson, PE  --  ALL Rights Reserved.
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Light Emitting Diode (LED) Circuits
Master Category List   --  Dave's 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 Lighthouse Flasher

LED Lighthouse Flasher for HO Model Train






Line Powered High Intensity LED Flasher

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


Model Airplane Wing Tip Flasher

Model Train Lighthouse Flasher Revisited

Modified LED Night Light

Negative 0.5 Volt Supply


One Nimh Cell powers White LED

One-Watt White LED Night Light

Plus & Minus DC Power Supply

PV Solar Cell Test Fixture

Radio Tower Lamp Monitor

Ramping Lamp Driver

Reduced Power Sequential LED Flasher

Revisited-Model Train Lighthouse Flasher

Shop Safety Light

Simple Circuit Negative Supply Circuit

Solar Modified Colman Lantern

Solid State Relay that is Bidirectional

Tester for Pulsed LEDs

Three Volt Universal LED Flasher

Three-Volt Low Battery Voltage Flasher

Three-Volt Powered Super Bright LED Flasher

Transmit to a Remote LED Indictor Light


Ultra Low Power LED Flasher

Voltage Monitor for a 9v Battery

White LED Array that is Lined Powered

White LED Driver powered by a 3v Battery

White LED Night Light


120 VAC / 240 VAC Indicator


1-Nimh Cell powers White LED

1us LED Pulse Driver + Voltage to Frequency Converter

1W White 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

3v Powered Super Bright LED Flasher

3v Universal LED Flasher

4 to 20ma Current Loop Senses Temperature


AC Line Powered LED Flasher

AC Line Powered LED Pilot Light

Auxiliary 12v Automotive Style LED Light Makes Table Lamp

Circuit Indicates Battery Charge Current

Circuit indicates Battery Charging Current

Classic Linear 5v Supply using 6.3VAC Transformer



Computer, Long Period, Watch Dog Timer

Constant Current Drives LEDs

Constant Current LED Driver

Control Variable LED Intensity

Controlled Up/Down Ramping Light

Drive a LED with an Intensity Ramping Mode


Flashing High-Power LED

Flashing LED Advertising Badge #1

Flashing Light to simulate Car Alarm

Generate 0.5v Negative Supply


HO Model Train Lighthouse Flasher

HO Train Lighthouse Flasher Revisited

Hot AC Power Line Indicator


Increased power for LED Flasher

Indicates 120 VAC or 240 VAC

Indicates Battery Charge Current

Inductive Pulse Receiver (175Khz)

LED Array powered by 24 VAC

Hobby Circuits by Category

Dave's Circuits

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

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Copyright  January, 1998 - June, 2021     David A. Johnson  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.