Ramsey Electronics EDF1, Electronic Dripping Faucet User Manual
Electronic Dripping
Faucet
Ramsey Electronics Model No. EDF1
Who would’ve ever thought that you would want the sound of a
dripping faucet in your house!! Especially after seeing how
annoying it was on all those cartoons we used to watch! Add
an unusual sound to your next alarm project with this unique
noisemaker.
• Unusual sound.
• Adjustable volume and decay.
• Runs on 4V to 9V DC.
• Small size for easy mounting.
• An easy way to irritate your friends and family and learn some
basic electronics too!
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PARTIAL LIST OF AVAILABLE KITS:
RAMSEY TRANSMITTER KITS
• FM10A, FM25B FM Stereo Transmitters
• AM1, AM25 Transmitter
RAMSEY RECEIVER KITS
• FR1 FM Broadcast Receiver
• AR1 Aircraft Band Receiver
• SR2 Shortwave Receiver
• AA7 Active Antenna
• SC1 Shortwave Converter
RAMSEY HOBBY KITS
• SG7 Personal Speed Radar
• SS70A Speech Scrambler/
Descrambler
• TT1 Telephone Recorder
• SP1 Speakerphone
• MD3 Microwave Motion Detector
• PH14 Peak hold Meter
• LC1 Inductance-Capacitance Meter
RAMSEY AMATEUR RADIO KITS
•HR Series HF All Mode Receivers
• DDF1 Doppler Direction Finder
• QRP Series HF CW Transmitters
• CW7 CW Keyer
• QRP Power Amplifiers
RAMSEY MINI-KITS
Many other kits are available for hobby, school, scouts and just plain FUN. New
kits are always under development. Write or call for our free Ramsey catalog.
EDF1 Electronic Dripping Faucet
Ramsey Electronics publication No. EDF1 Rev. 1.2
April 2003
COPYRIGHT 2003 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York
14564. All rights reserved. No portion of this publication may be copied or duplicated without the
written permission of Ramsey Electronics, Inc. Printed in the United States of America.
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Ramsey Publication No. EDF1
Manual Price Only $5.00
KIT ASSEMBLY
AND INSTRUCTION MANUAL FOR
Electronic Dripping
Faucet
TABLE OF CONTENTS
Introduction to the EDF1 ................................... 4
EDF1 Circuit Description ................................... 4
“Learn-As-You-Build” Kit Assembly ................... 5
Parts List ........................................................... 6
Assembly Steps ................................................. 7
Setup and Testing ............................................. 8
Troubleshooting Guide ....................................... 8
EDF1 Parts Layout Diagram .............................. 9
EDF1 Schematic .............................................. 10
Ramsey Kit Warranty ....................................... 11
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RAMSEY ELECTRONICS, INC.
590 Fishers Station Drive
Victor, New York 14564
Phone (585) 924-4560
Fax (585) 924-4555
www.ramseykits.com
INTRODUCTION
Have you ever had a project that you needed an alarm or alert signal for, but
you were tired of the same old “beep beep”? Have you ever made an
annoyance alarm to surprise that special someone, but the sound just wasn’t
irritating enough? Well, help has arrived! The Ramsey EDF1 will provide you
with a small, easy-to-mount noisemaking solution to fill all your unique
auditory needs. All you need to do is connect a small 8 ohm speaker and off
you go!
EDF1 CIRCUIT DESCRIPTION
This is a fairly simple circuit, and pretty easy to follow even for a beginning kit
builder. The kit is built around a one-transistor oscillator made with Q1. This
oscillator is underdamped and is “struck” into oscillation by briefly raising the
voltage between R10 and R5. After the voltage between R10 and R5 returns
to normal, the oscillation dies out, as shown in the picture.
The effect is an exponentially decaying sine wave. An NE555 timer provides
the “striker” that gets the oscillator going. Every second or so the NE555
outputs a pulse that appears at the junction of R10 and R5. Then Q1 outputs
the waveform above which is fed to an audio amplifier. The result is an
output that sounds like a faucet drip or sometimes maybe a guitar string
pluck.
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