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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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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 Lighthouse Flasher

LED Lighthouse Flasher for HO Model Train

LED Strings powered by AC Line

LED Test Signal Generator-40Khz

Light to Frequency Converter

Line Powered High Intensity LED Flasher

Low Current Flashing LED Power Indicator

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

Momentary Touch Activated Switch

Monitor ON/OFF status of a Remote Switch

One-Watt White LED Night Light

Optical Filter using Color Film Negative

Over-Temperature Micro-Power Alarm

Protects from Battery Polarity Reversal

PWM Circuit for Motor Speed Control

PWM Motor Controller uses a 555 Timer

Ramping Lamp Driver

Reduced Power Sequential LED Flasher

Remote Range Extender TV/VCR

Remote TV Camera Power

Replace a Pushbutton Switch with this Infrared Safety Switch

Safety Light

Service Request Beeper

Servo Pulse to Voltage Converter

Shop Safety Light

SSR Requires Ultra Low Control Current



Thermostat for 12v Cooling Fan

Three Volt Universal LED Flasher

Three-Volt Low Battery Voltage Flasher

Three-Volt Powered Super Bright LED Flasher

Transistor-Switch Detects Audio Signal

Transmitter for Line Powered Xenon Flash

TV-VCR Light Source 40Khz Repeater


Universal Flasher using a Latching Relay

Water Filling Station Controller

Water Pump controlled by Solar Power

White LED Array that is Lined Powered 

12 Volt Lite/Dark Lamp Switch

12v Brush Motor Speed Controller

12v DC Motor with Logic Controlled Automatic Brake

14v LED AuxiliaryLamp with a 60 Watt Lamp

1W White LED Night Light

2 Pushbutton Motor Controller

3 Minute LED Closet Light

3v Powered Super Bright LED Flasher

3v Universal LED Flasher

50ua Current Drives Solid State Relay Requires Only

AC Line Powered LED Flasher

AC Line Under/Over Voltage Alarm

Alarm Sounds At Freezing Temperatures

Automatic DC Motor Brake

Battery-Powered Freezer Alarm

Battery-Powered LED Flashing Advertising #2

Bi-Directional Charge Coupled Powers MOSFET Relay

Boost Infrared TV/VCR Remote Signal

Capacitance Touch Switch

Characteristics of CMOS Logic Inverter Amplifiers

Classic Linear 5v Supply using 6.3VAC Transformer


Control Variable LED Intensity

Controlled Up/Down Ramping Light

Controller for a 9v Powered Xenon Photoflash

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

Flashing High-Power LED

Flashing LED Advertising Badge #1

Fluorescent Lamp Intensity Modulator

Fluorescent Lamp Night Light Needs Only 1 Watt


HO Model Train Lighthouse Flasher

HO Train Lighthouse Flasher Revisited

Increased power for LED Flasher

Infrared Remote Extender Circuit

IR TV/VCR Remote Booster


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