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Hobby Circuits designed by Dave Johnson

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

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Beeper & Buzzer Circuits
Circuits Designed by David Johnson, P.E. :

Doggie Water Dispenser Alarm

Door Knob Alarm

Door Knock Beeper

Knocking rings Doorbell

LED Array powered by 24 VAC

Next-Generation-Star-Trek Doorbell

Piezoelectric Beeper that is Very Loud

Piezoelectric Triggered Switch

Piezoelectric Vibration Sensor Activates Switch

Power Loss Beeper

Power Reminder Beeper

Produces Beep once each Minute

Pushbutton Activates Service Request Beeper

Really Loud Output Beeper Circuit

Remote Doorbell Beeper

Service Request Beeper

Snow Depth Alarm

Sound Generator-Clicking

Star Trek Doorbell

Star-Trek Next-Generation Doorbell

Still Another Very Loud piezo Alarm Beeper

Sweeping Siren Alarm-3 volts

Switch activated by Piezo Vibration

Tap Switch uses a Piezo Wafer

Three-Volt Powered Very Loud Beeper

Time to Dust

Touch Alarm for Door Knob

Unplugged Appliance Alarm

Very Loud 3v Powered Beeper

Very Loud Beeper Circuit

Very Loud Pulsating Beeper

Well Pump Flasher & Beeper

24V DC Powered Beeper with 4 Separate Inputs

3v Powered Loud Beeper

3v Sweeping Siren Alarm

AC Power Loss Alarm

Alarm Beeps when the “Check Engine” Light Turns On

Another Very Loud piezo Alarm Beeper

Appliance Unplugged Alarm

Basement Doorbell Beeper

Basement Remote Doorbell

Beeper indicates Check Engine

Beeper that is Very Loud

Call-for-Service Beeper

Check Engine Beeper

Circuit Monitors 120 Power Line

Circuit Monitors Power Loss

Click Sound Generator

Doorbell heard in Basement

Finger Tap Piezo Relay


Footstep Alarm for Human Traffic

Front Desk Service Beeper

High Sound Output Beeper

Illuminated 16vAC Doorbell Lamp Replacement  

Indicates when it is Time to Dust


Hobby Circuits by Category

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



Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

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