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Hobby Circuits designed by Dave Johnson

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

List of Dave's Circuit Designs

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



DC to DC Power Supply Circuits
 
Circuits Designed by David Johnson, P.E. :

CMOS Inverters Form 125Khz Oscillator

CMOS Nand Gate Forms Gated 125Khz Oscillator

Digital noise generator

ELC signal between 200Mhz-400Mhz

Exciter Circuit-12v Touch Switch

FETs & Logic Devices Divides Supply Voltage on Charge Pump Efficiently 

Flexible Outputs from Square Wave Driver

Fluorescent Lamp Night Light Needs Only 1 Watt

Fully Isolated 50/60hz Sync Generator

Gated 125Khz Oscillator

Gated Crystal Oscillator with Very Low Power

Generate 0.5v Negative Supply

High Power Touch Switch Exciter Circuit

Laptop Power Supply

LC Oscillator Medium Power 125Khz

Medium Power 125khz Oscillator

Medium Power 125khz Oscillator #2

Micro Power Over-Temperature Alarm

Negative 0.5 Volt Supply

Over-Temperature Micro-Power Alarm

Peak to Peak 300v Signal Generator

RS-232 Serial Interface Status Indicator Circuit

Simple Circuit Negative Supply Circuit

Square Wave Driver Has Flexible Outputs

Touch Switch Exciter

Ultra Low Power Human Finger Detector

Ultra Pure 125kHz Sine Wave Signal Source

Very Low Power Astable Multivibrator

Very Low Power Gated Crystal Oscillator

Voltage Boost to Series Regulator provided by Capacitor

Voltage Converters-0.5 to 6 Volts
+5v Powered Charge Pump Battery Charger

0.5v Negative Supply

0.5v to 6v Voltage Converter

1 Watt Fluorescent Lamp Night Light

125Khz LC Oscillator

125KHZ Medium Power Oscillator

125Khz Oscillator from CMOS Inverters

125khz Oscillator with Medium Power

125Khz Ultra Pure Sine Wave Signal Source

12v to 19v Laptop Power Supply (Concept)

12v Touch Switch Exciter Circuit

200Mhz-400Mhz Voltage Controlled Oscillator (VCO)

24v NiMH
Battery Charger using a 12v Solar Panel 

300v Peak to Peak Signal Generator

5+V Classic Linear Supply using 6.3VAC Transformer

50/60Hz Sync Generator-Fully Isolated

Astable Multivibrator with Very Low Power

Audio Frequency Digital Noise Generator

Battery Powered Plus-Minus 15v Supply

Caps Provide Voltage Boost to Series Regulator

Charge Pump Battery Charger-+5 Volts

Charge Pump Efficiently Divides Supply Voltage 

Classic Linear 5v Supply using 6.3vAC Transformer

CMOS Inverter 125khz LC Oscillator

CMOS Inverter forms a Resonant LD Oscillator 

 

Hobby Circuits by Category

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

 

 


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