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Hobby Circuits designed by Dave Johnson

Last Updated on: Wednesday, November 22, 2017 02:30 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!




Signal Generation Circuits
 
Circuits Designed by David Johnson, P.E. :
Honeybee Counter

Indicates when it is Time to Dust

Indicates when it is Time to Dust

It's Time to Dust Indicator

LC Oscillator Medium Power 125Khz

LED Flashing Badge #1

LED Flashing Badge #2

LED Test Signal Generator-40Khz

Light to Frequency Converter

Low Battery Voltage Flasher

Low Frequency Oscillator draws only 2 Nanoamps

Low Power 100khz Light Receiver

Measure Button Battery Cell's Internal Resistance 

Medium Power 125khz Oscillator

Medium Power 125khz Oscillator #2

Micro Power 40Khz Burst Laser Diode Driver

Micro Power Over-Temperature Alarm

Micropower CMOS Oscillator, Draws Only 0.5ua

Miniature Pushbutton On/Off Switch

Motorized Duck Decoy Timer

On/Off Flip/Flop Circuit with Automatic Timeout

One Shot (D-Flip/Flop) Circuit

Oneshot & Latch Pushbutton

Oscillator Draws 2 Nanoamps

Oscillator with Ultra Low Current

Over-Temperature Micro-Power Alarm

Parallel LC Oscillator with CMOS Inverter 

Precision 40Khz Triangle Generator

Precision Ultra Lower Power Oscillator

Slotted Opto-Sensor used in Honeybee Counter

Ten-Second Ultra Lower Power Oscillator

Time to Dust

Timer for Darkroom Camera Shutter

Touch Activated Switch

Triangle Signal Generator

Turn D-Flip/Flop into a One Shot Circuit

Ultra Low Current Oscillator

Ultra Low Current Oscillator #4

Ultra Low Power 32Khz Crystal Oscillator

Ultra Low Power Astable Multivibrator

Ultra Lower Power Oscillator

Ultra Pure 125kHz Sine Wave Signal Source

VCO from CMOS Schmitt Trigger IC

Version 4 of a Ultra Low Current Oscillator

Very Low Power Astable Multivibrator

Very Low Power Gated Crystal Oscillator

Very Low Voltage Oscillator Circuit
1 Second One Shot Circuit

10 Second Ultra Lower Power Oscillator

100Khz Low Power Light Receiver

125Khz LC Oscillator

125KHZ Medium Power Oscillator

125Khz Oscillator from CMOS Inverters

125khz Oscillator with Medium Power

125Khz Ultra Pure Sine Wave Signal Source

200Mhz-400Mhz Voltage Controlled Oscillator (VCO)

3 Volt Low Battery Voltage Flasher

3v 2hz Oscillator

40Khz Burst Laser Diode Driver

40Khz LED Test Signal Generator

40Khz Precision Triangle Generator

Advertising Badge #1 with Flashing LED

Advertising Badge #2 with Flashing LED

Astable Multivibrator with Very Low Power

Astable Ultra Low Power Multivibrator

Automatic Timeout included with this On/Off Flip/flop Circuit

Battery-Powered LED Flashing Advertising #2

Button Battery Cell Internal Resistance Measurement Circuit

Cheap Low Power 3v 2hz Oscillator

CMOS Inverter 125khz LC Oscillator

CMOS Inverter forms a Resonant LD Oscillator 

CMOS Inverter Parallel LC Oscillator

CMOS Inverters Form 125Khz Oscillator

CMOS Nand Gate Forms Gated 125Khz Oscillator

CMOS Oscillator, Draws Only 0.5ua

CMOS Schmitt Trigger IC Makes VCO

Crystal Controlled 1KHz Signal Generator

Delayed Pulse Generator

D-Flip/Flop One Shot Circuit

ELC signal between 200Mhz-400Mhz

Flashing LED Advertising Badge #1

Flexible Outputs from Square Wave Driver

Gated 125Khz Oscillator

Gated Crystal Oscillator with Very Low Power

Generate Short Delayed Pulse

Highly Stable Lower Power Oscillator

 

Hobby Circuits by Category

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