Projects for Persons with an Electronic Hobby
NOTE: You will find my Email Address and Phone Number on my Home Page.
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"After the Middle of August, 2008".
(Sorry, Medical Problems.)
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Hobby Projects to Build, That Work.
These projects are for varying purposes.
Some are easy, some are difficult,
but all of them have been built and definately work!
If You Have Questions or NEED HELP? *** E-mail me! ***
Latest Update: April 30, 2008
GENERAL PROJECT NOTES:
1) If you Built These Projects,
You do so Totally at your Own Risk:
a) I Assume No Liability for any Errors and Omission.
b) I will also Not be held Responsible for any Injuries or Death, as what you build is Totally out of my control.
c) All Electronic Projects: "Require a certain amount of Skill and Caution".
Electricity Can be Deadly.
2) In ALL my projects, All Capacitors are stated in "uF", (Microfarads) Unless otherwise noted.
3) In most of the parts listings and schematics you find in these articles,
I list resistors and sometimes capacitors with the multiplication factor within the values.
Examples: 4K7 is a 4.7 K. 3M3 is a 3.3 Meg. 4P7 is a 4.7 Pf. 4u7 is a 4.7 uF
100R is 100 Ohms 4R7 is 4.7 ohms (R = Resistance)
** This is common practice by some manufactures and the reason for this is
quite simple. By putting the "letter" in place of the "Tiny Decimal Point"
it eliminates the chance of missing it.
Particularly on a poorly photo-copied or printed copy of a schematic.
"My Forum for Readers Comments or Questions"
Definately Not the best, But it is free.
Click Here, "Soldering PROPERLY."
Definately MOST IMPORTANT For Your Projects.
Click Here, "Some Data Sheets."
For a few Hard to get ones.
"Alarm Circuit", Using a Laser Beam!
Surround your Entire Yard with this Laser Alarm
"The Alternator", A Guideline to Testing it!
Also the car battery, and cables.
"The Amplified Zener", Greatly Increase Power Ratings!
And Substantially Reduce Noise Voltages.
"A 13.5 Watt RMS Amplifier",
Really, Really Simple.
"Anemometer Circuit.",
A totally Electronic circuit to measure Air Flow, Zero to 250 feet per Minute.
Thats only 2.84 MPH, But it can be Modified for other Rates of Air Flow.
"Battery Rejuivnator for Lithium Batteries",
These batteries are Not Rechargable.
But you can get Considerable Extra Life in this way.
"Battery-Monitor", Very Simple Circuits for your car.
"Battery Charger", Current and Voltage Regulated for Sealed Lead Acid types
Like the Battery used in my Metal Detector or other simular types
"Battery Charger, 110 to 12 volt, Non-Isolated type.
"POSSIBLE SHOCK HAZZARD", A Good Simple Charger, BUT When Charging,
"This Circuit and the circuit it is connected to, MUST BE ISOLATED FROM THE USER"
"Car Battery Charger", An "SCR Design with a 10 Amp rating".
"Calculators for Coils, Inductance and Much More",
A Bunch of Very Useful JavaScript Calculators that I created.
"Car Loop Detector",
Another Simple, But Very Effective Circuit.
Bury the coil in your driveway and it will detect any vehicle there.
"A Cat or Dog Detector, for a Cat or Dog Flap on a door.
This is Now Working".
"But Subject to possible changes for improvements".
"Circuits, Miscellaneous.",
I have Numerous Circuit, Some Simple, Some Not.
Some are Building Blocks, Some are Not.
MORE WILL BE POSTED HERE SOON, as I get them drafted up.
"Color Organ for a Car,
3 Channels.", An Active Filter Design.
Mosfet outputs can drive Subsantial Currents for driving Lamps or ???.
NOTE: Now a New Design for Common Grounded Lights using P-Mosfets.
"Color Organ for in Home, 3 Channels.",
An Active Filter Design.
An old idea, but I've had numerous requests for a good design for this.
So Here It Is.
"Delayed DC Power"
This circuit Creates a Tiny Power Delay to a Circuit. Read Why I designed it.
An "Up / Down Digital Counter" With 7 Segment LED Displays
"REVISED" Really as Simple as you can get and has 4 Displays.
"Diodes in Parallel, An Article on increasing current capability, Plus More."
Dimension Control,
Add an effective New Dimension to your Stereo sound, "Increase Seperation and Reduce Noise".
"Electro-Etching"
An Alternative, Cheaper method of Etching PCB's, uses much less Ferric Chloride
"Electro-Static Air Filters",
This article deals with Principals of a Good Electrostatic Filter system, Plus Basic Plans.
"With a Schematic for the HV Static Supply",
"And I can Now Supply the Trigger Coil for this",
"Fluid Sensor and More."
It Can Detect Most Liquids and more.
"Ground Fault Indicator"
Check out your AC Outlets for Possible Hazzards
"An Electric Fence project"
A Very Efficient and Simple Cmos Design.
"A H-Bridge Design"
With a Protection against Having Two Positive Input Pulses.
"A Momentary High Voltage Arc Circuit"
Can be used to Ignite a barbeque or a Gas in a Potato Gun.
"Hydrogen Generator below, Will it produce more?"
MY TEST RESULTS
"Hydrogen Generator, PWM Circuit"
Included are:
Basic Cell Construction using ABS plastic.
And: A Basic PWM, With a fixed Freqency.
And: My Simple Hyderogen PWM with frequency adjust.
And: A Current Limited PWM. (Max. Current Limit Control)
And: An 02 Extender Circuit.
And: A Mark/Space Generator.
Also: A TL594, 3 Frequency Generator.
"Ignition Coil Driver"
A Simple Circuit to run a Car Ignition Coil to Obtain High Voltage.
"Inductor and Ferrites"
How to Determine AL Vaues for use in winding Ferrite Core Coils.
"Inverter, A 12 volt unit, Very Basic type"
Simple and Useable to play with, But not practical and a Waste of time and Money.
Not Near as Efficient as my Mos-Fet Inverter below.
"Inverter, 12 volt unit, Mos-Fet design
A Very Reliable, Efficient and Practical Design.
Do Not ask how to Build this for Power ratings over 1000 watts,
That is NOT Practical.
"Knight Rider", Look-a-like Lights.
"An LED Flasher", with a Slow Rise and Fall Time
A Simple Circuit Using a 555.
"Digital Lock",
A Simple, But Very Effective Circuit.
"Vehicle Loop Detector",
Another Simple, But Very Effective Circuit.
"A Low Battery Cutoff"
Also acts as a Master On / Off Switch.
NOW, A New P-Mos Version. Supplys Positive voltage to grounded devices.
A Simple BFO Metal Detector"
Not the best, but can be useful.
Metal Detector Coils, for my PI Detectors
Small Detector Coils, with Ferrite Cores for my PI Detectors
Testing Metal Detector Coils,
for Free Air Resonance and Interwire Capacitance.
Metal Detector, A Pulse Induction Detector. "Pulse-1"
Hundreds of this Detector have been built with Very favourable Feedback.
Metal Detector, My "Pulse-2" Induction Type Detector
This is a Revised Version of the Pulse-1 above with Additional
Controls for More Flexibility.
This Project is Definately Not Recommended for the Beginner.
My Metal Detector Coil Jig
Not a Project, But this is how I make the Flat Coils.
I have Shown this here because of Numerous Requests.
Pictures of My PI Metal Detector Project.
These have been "Built by Various Persons", Including there Comments.
"Metal Detector", based on the CS209, Now Discontinued.
Especially Suited to find studs in Walls.
Note: this IC is discontinued and getting hard to obtain.
"Metal Detector", based on the TDA0161.
Preliminary Circuit Article...More Info to Come.
Microphone from a Speaker,
A circuit to Impedance Match a Speaker, as a Mike.
Speakers can make a Good Microphone for some applications.
Bigger Speakers may also have a Good Low Frequency Response.
Ever seen a 15 Inch Microphone, this Circuit will do it.
"Op-Amps", Basic Circuits for the beginner.
The 7 Basic Circuit Configurations for op-amps
"An Oscillator, Sawtooth and Square Wave Output",
Simple, Single Supply and Works Very well with Minimum Parts Count.
"The Oscilloscope, a Collection of Setups and Waveforms.
"Parabolic Microphone",
An Article & Circuits for Parabolic and Shot Gun Microphones
"Parts For Sale",
You might want to check out What I Have.
"PCB Layouts", Assorted PCB's that I have designed.
Hydrostar Generator, M250 Power Amp & More to Come.
Etched Boards Available on Request
"Peltier Devices or Thermoelectric Modules.
Also known as "TE Modules" or "Solid State Heat Pumps".
"Power Supply", Voltage and Current Regulated.
A Versatile and Most useful device, Especially for the Beginner
"Super Power Supply", Voltage and Current Regulated.
With Suitable Output Transistors, This Supply Can handle almost any Voltage or Current.
This Design is based on the Discontinued MC1466L Integrated Circuit,
But Now you can make it using Descrete Parts. Transistors, Caps and Resistors.
Although not Really Difficult, I don't believe this Project is Suitable for the Beginner.
"A Simple Switching Power Supply".
A Versatile and useful supply to Experiment with, Good for the Beginner to learn.
"Transistor Preamp", Very Good.
A versatile, High Gain design. Can be Frequency compensatated for Various applications,
including Dynamic Microphones, Tape and Phono Applications.
Shown is a "Flat" response, but most others can be easily obtained.
"Proximity Detector"
Here is a Simple, But Very Effective One.
"Pulsed LED", A High Current Circuit.
Just to Play with, But it Might have some Practical Applications.
"PWM", A High Current Pulse Width Control, Excellent and Real Simple!
Newly Revise Design, NOW for Either "N" or "P" Channel Mos-Fet's.
"Roulette Wheel", A 4000 Series, C-Mos design.
Has numbers 1 to 36 plus the 0 and 00, with totally random odds.
"An SCA Adapter".
For Advertisement Free Background Music on FM.
"Sine Wave Oscillator".
Here is a simple Low Distortion Sine Wave Oscillator Circuit.
"A Solar Cell, Battery Charger".
A Simple Regulator for Charging Lead Acid Batteries from a Solar Cell.
"Sound Pressure Level Meter".
The Schematic and PCB have now been Completed, It All works well.
"Strobe Light", 12 Volt, Coil Powered.
"Stun Gun Circuits, 1 & 2", For Ammusement only!
"A Powerful Stun Gun Circuit, 3",
Presented Here For "Informational Purposes only", "Not for Actual Construction!"
A Temperature Sensor Control
A basic circuit using Diodes to detect temperature differences.
"TENS" Circuits, that I have Designed, built and used
I make No Medical Claims as to the Usefulness of these devices.
A Thermostat Control for Electric Heaters
Two practical replacement for heaters with problems, or an add on.
"Timer circuits for Very Long Delays, Using a CD4541B
Very Useful Timers.
"FM Transmitter.
A simple 2 transistor circuit with a Coil on the PCB".
"Vehicle Loop Detector",
Another Simple, But Very Effective Circuit.
Bury the coil in your driveway and it will detect any vehicle parked there.
"Voltage Booster" (Very Simple)
Uses a LT1372 and only a Few parts, But can handle 1. 5 amps Input Current.
Input as low as 3 Volts, Output may be as high as 35 Volts.
"LED Voltmeter, Expanded Scale (ideal for your car)
Its Useful to see the charge voltage.
This Helps in detecting a Bad Alternator before it creates a dead battery.
"Watt Meter", Measures True RMS Watts
Measure All your AC Household Appliances.
"My New Windmill Design", Free Power
A Practical Alternative to help reduce your Heating Bills.
More to come, Soon
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All Imformation in this Article is "Copyright protected".
Chemelec *Copyright © 2002, 2008*
