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Hobby Circuits designed by Dave Johnson

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

List of Hobby Circuit Designs

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

Silicon Controlled Rectifier (SCR) Circuits
Circuits designed by David Johnson, P.E. :

Display RF Signal Strength

Ideal Diode Function

Isolated Miniature AC/DC Power Supply

Laser Light Detyector-10Mhz to 20Mhz

LED Array powered by 24 VAC

LM317 adjustable voltage regulator used in Battery Eliminator Circuit

Low Power 12,000 Volt Power Supply


Monitors AC Current

Photovoltaic Solar Panels-Ideal Blocking Diode Circuit

Plus & Minus DC Power Supply

Protects from Battery Polarity Reversal

PV Solar Panels-Ideal Blocking Diode Circuit


RF Signal Detector at 2.45GHz

Tester 4-20ma Current Loop

Touch Switch 240VAC

Voltage Boost to Series Regulator provided by Capacitor

24 Volts AC to 24 Volts DC Power Supply

24V DC Powered Beeper with 4 Separate Inputs

24-Volt AC Powered Isolated +5V Supply

A Current Transformer used to Harvest Energy

AC Current Monitor

AC to DC (240v to 5v)Power Supply

AC to DC 18V Power Supply

AC to DC Power Supply requires Low Power

AC/DC relay from Charge Coupled MOSFET

Capacitance-Based Touch Switch

Circuit Eliminates 9v Battery

Convert AC to DC signal with is Full Wave Rectifier


Hobby Circuits by Category

Dave's Circuits

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


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