Circuits designed by David Johnson, P.E.
Last Updated on: Friday, December 29, 2017 02:53 AM

List of Dave's Circuit Designs

Text & Graphics Copyright © David A. Johnson, PE  --  ALL Rights Reserved.
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Audio Frequency Digital Noise Generator

Caps Provide Voltage Boost to Series Regulator

Charge Pump Efficiently Divides Supply Voltage 

Classic Linear 5v Supply using 6.3vAC Transformer

CMOS Inverter 125khz LC Oscillator

CMOS Nand Gate Forms Gated 125Khz Oscillator

High Power Touch Switch Exciter Circuit

Medium Power 125khz Oscillator

Medium Power 125khz Oscillator #2

Micro Power Over-Temperature Alarm

Square Wave Driver Has Flexible Outputs

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 Converters-0.5 to 6 Volts

+5v Powered Charge Pump Battery Charger 

0.5v Negative Supply

1 Watt Fluorescent Lamp Night Light

125Khz LC Oscillator

125Khz Oscillator from CMOS Inverters

12v to 19v Laptop Power Supply (Concept)

12v Touch Switch Exciter Circuit

200Mhz-400Mhz Voltage Controlled Oscillator (VCO)

300v Peak to Peak Signal Generator

50/60Hz Sync Generator-Fully Isolated