"My Forum for Comments, Questions & Answers"Not the best, But it is free.
Build Electronic Hobby Projects, That Work.
Latest Parts Update:
Mar 25, 2019, Due to Health Issues, I need to Dispose of my Inventory.
Either I Give them away or Dump them all in the Garbage
So All my Electronic Parts are Now FREE, Excluding the Shipping Cost.
This does NOT Include Parts that need to be Counted out for Specific Kits.
Doing That take too much Time, so a charge will be necessary and PCB's are usually only made on demand, so they are not free.
I Mostly have Just Analogue Parts and some of the 4000 Series, C-Mos IC's.
I have Far Too Many Part to list them, So Tell me What parts you want and I will let you know if I have them.
Shipping Cost Depends on Total Weight and Where it is being sent to?
NOTE: Your Subject Line MUST contain the word Electronic!" or it goes to "JUNK MAIL".
E-Mail Me at: chemelec@hotmail.com
"FindChips.com"
This Will Search "Many Suppliers of ALL Electronic Parts",
Not just IC Chips.
All projects below, that are created by me are:
"Copyright", with all right reserved.
Building these projects for "PERSONAL USE" is Acceptable,
However I do not give permission for any other purpose.
These projects are for varying purposes.
Some are easy, some are difficult,
but all of them have been built and definately work!
1) If you Built Any of These Projects,
2) And I Recommend that All Projects should be Properly Fused, for added protection.
a) I Assume No Liability for any Errors and Omission.
3) In ALL my Schematics, All Capacitors are stated in "uF", (Microfarads) Unless otherwise noted.
However these caps may have Different Marking on them:
4) In ALL my projects, All Resistors are 1/4 Watt Unless otherwise noted.
5) In most of the parts listings and schematics you find in these articles,
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.
GENERAL PROJECT NOTES:
You do so Totally at your Own Risk:
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.
A ".001" Cap is the same as "1n" or may also be marked as "102".
Likewise a ".0047" Cap is the same as "4n7" or may also be marked as "472".
A ".01" Cap is the same as "10n" or may also be marked as "103".
Likewise a ".068" Cap is the same as "68n" or may also be marked as "683".
A ".1" Cap is the same as "100n" or may also be marked as "104".
Likewise a ".22" Cap is the same as "220" or may also be marked as "224".
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
"My Forum for Comments, Questions & Answers"
Not the best, But it is free.
Click Here, "Soldering PROPERLY." Click Here, "Some Data Sheets."
"Alarm Circuit", Using a Laser Beam!
Surround your Entire Yard with this Laser Alarm
"The Car Alternator", A Guideline to Testing it!
Also the car battery, and cables.
"Alternator Regulator",
My NEW "P-Mosfet" Voltage Regulator.
For Typical 12 Volt Battery Charging
or possible HIGH Voltage Outputs of up to 100 Volts.
"Another Alternator Regulator",
"Ducati" Monster Motor Cycle, Voltage Regulator.
Or Other "Permanent Magnet" Alternators.
"The Amplified Zener", Greatly Increase Power Ratings!
And Substantially Reduce Noise Voltages.
"A Simple & Small Audio Amplifier",
Extremely Simple and useful for many applications.
"A 10 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 MAYBE it can be Modified for other Rates of Air Flow.
"Battery-Monitor", Four 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".
Another Battery Charger, for small battery's or battery Packs.
This "Trickle Charger" is Both Current and Voltage Regulated for Sealed Lead Acid or NiMh types.
It uses a Wall Adapter as the main Power Source and Can charge a 6 or 12 Volt ones.
"A Solar or Wind Charger/Dump Circuit
"Solid State design, No Relays
"This is just a Preliminary design".
"My Origional Battery Desulfation/Tester".
This circuit helps to Desulfate Lead Acid batteries.
Added Bonus: This Circuit also gives a good indication of the "Internal Resistance" of the battery.
"My NEW HIGH CURRENT Battery Desulfator/Tester".
This circuit helps to Desulfate Lead Acid batteries.
Added Bonus: This Circuit also gives a good Indication of the "Internal Resistance" of the battery.
Custom made "Boxes for Projects".
"Easy to Make Boxes" of Many Sizes and Shapes.
"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.
"A Car Coil, Output Voltage Tester",
"Chemicals and More",
From a Really old Pharmaceutical Book.
REVISED, April 16, 2013
"Compact Florescent Lamps".
"This is NOT a Construction PROJECT",
"Just a Typical Look at its Circuitry, for anyone interested.".
"Car Ignition Coil Driver", From 12 Volts DC
A Simple Circuit to run a Car Ignition Coil to Obtain High Voltage.
Or a 12 volt to 110 or 220 volt transformer for low power applications.
"Car Ignition Coil Driver", From Direct 110 VAC or 220VAC.
These SCR Circuits can run a Car Ignition Coil in your home, to Obtain High Voltage.
"Car Loop Detector",
A Simple Circuit, but not as Stable as I would like.
Bury the coil in your driveway and it will detect any vehicle there.
"Car Loop Detector-2", More Stable.
A Better Circuit, And It is Very Stable.
Bury the coil in your driveway and it will detect any vehicle there.
"Another Car Detector", "Loop-3".
A Better Circuit, And Extremely Stable.
Bury the coil in your driveway and it will detect a vehicle coming in it.
IF IT CONTAINS a Reasonable Amount of a MAGNET METAL, Such as Steel.
"A Cat or Dog Detector, for a Cat or Dog Flap on a door. (This has some Stability Problems.)
However the "Car Loop Detector-2" Above is Much Better for detecting these animals.
Just use this Same, Single Loop of wire on the animal and it works good.
"Just some Coil pictures",
This May help some people.
"A 3 Channel Color Organ for Home Use......Revised May 23, 2016
An Active Filter Design.
"Common Ground", 3 Channel Color Organ for a Car.
An Active Filter Design.
"4 Channel, HOME Color Organ.
"FOUR Channels.", All Channels are Active "Band Pass" Filters.
"This has Much better Light Seperation and a Parts Kit with the PCB is now Available.".
"4 Channel, CAR Color Organ.
"FOUR Channels.", All Channels are Active "Band Pass" Filters.
"This has Much better Light Seperation and a Parts Kit with the PCB is now Available.".
"Delayed DC Power"
This circuit Creates a Tiny Power Delay to a Circuit. Read Why I designed it.
"A 555 Delayed DC Power Source"
This circuit can give a few minutes of Delayed Power to a Circuit.
An "Up / Down Digital Counter" With 7 Segment LED Displays
"REVISED" Really as Simple as you can get and has 4, 5 or 6 Displays.
"REVISED" This Schematic and PCB's updated on Nov 2, 2011.
"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".
"My Electric Fence Monitor"
A Very Efficient and Simple Cmos Design.
My "Electric Fence project", "Fencer-1"
A Very Efficient and Simple Cmos Design..
Look and See What one of this circuit Caught?
Another "Electric Fence project", "Fencer-2"
Considerably MORE POWERFUL, If Needed!.
This is "the Second Most Popular Project on my site".
"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.
"My Freezer Alarm and Freezing Alarm Circuits"
VERY SIMPLE and EFFECTIVE.
"Geiger Counter"
Some people might like this.
"Ground Fault Indicator"
Check out your AC Outlets for Possible Hazzards
"Headlight Minder"
Turns OFF your Headlights, if you forget.
And with a Time Delay, if wanted.
"My Heated Floor System."
This is Just an Article, NOT A Project.
"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, PWM Circuit"
Included are:
Basic Cell Construction using ABS plastic.
And: A Basic PWM, With a fixed Freqency.
And: My "Simple Hydrogen PWM" with frequency adjust.
And: A Current Limited PWM. (Has a Max. Current Limit Control)
Also: My New Current Limited PWM, Highly Efficient. ("My Ultimate PWM").
"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.
Negative and Positive Ion Generators.
"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.
Lamp Status Monitor.
This Circuit will detect a Burned out Light Bulb and light an LED when this occurs.
It Could be useful to monitor your cars Brake Lights.
"A 25 LED Chaser". (Sequencer)
A Fairly Simple C-Mos Circuit.
"An LED Flasher", with a Slow Rise and Fall Time
A Simple Circuit Using a 555.
"Digital Lock",
A Simple, But Very Effective Circuit.
"A Low Battery Cutoff"
Also acts as a Master On / Off Switch.
NOW, Also a New P-Mos Version. Supplys Positive voltage to grounded devices.
LOW OHM Digital Meter.
They Measure from: 0.001 to 1.999 Ohms, or from: 0.01 to 19.99 Ohms.
Also a "NEW" Dual Range Meter.
My Method for Measuring Gig/Tera Ohm Resistors.
A BFO Metal Detector"
Not the best, but Simple, and Now with a PCB.
A BETTER BFO Metal Detector"
Much Better and Simple, Parts and PCB Available.
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.
A Metal Detector, for Pin Pointing.
"Possibly More info to come later".
My "SUPER SENSITIVE", Pin Pointing Metal Detector.
"Metal-AV, A Pulse Induction Detector."
A PI Detector with "Audiable & Visual" Indications of Targets.
Suitable for use on some Conveyor Belts.
My "NEWEST", PI Metal Detector
A Single Coil Pulse Induction Detector.
Just as Good as my "Pulse-1", but less Expensive.
And Most people Only Use a Single Coil.
Metal Detector, A Pulse Induction Detector. "Pulse-1"
Hundreds of this Detector have been built with Very favourable Feedback.
This is "the Most Most Popular Project on my site".
Pictures of My Pulse-1 & 2 Metal Detector Project.
These Detectors have been "Built by Various Persons",
And I included their Comments on it's performance.
Metal Detector, My "Pulse-2" Induction Type Detector
This is a Revised Version of the Pulse-1 above with Additional
Controls for Possibly More Flexibility.
This Detector is "Definately Not for the Beginner".
My Metal Detector Coil Jig
This is Not a Project, But this is how I make the Flat Radial Coils.
I have Shown this here because of Numerous Requests.
"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.
Using a Speaker as a Microphone,
A circuit to Impedance Match a Speaker, as a Mic.
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.
"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.
"Op-Amps", Basic Circuits for the beginner.
The 7 Basic Circuit Configurations for op-amps
Inside the 741 Op-Amp, Zoomed in Pictures.
"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
NOW With some NEW CIRCUITS.
"Parts For Sale",
You might want to check out What I Have.
"Peltier Devices or Thermoelectric Modules.
Also known as "TE Modules" or "Solid State Heat Pumps".
New: A One Can Pop Cooler.
"A Power Monitor, for AC Lines of 110 to 240 VAC."
May be useful to some persons.
"LM723 Power Supply", Voltage and Current Regulated.
A Versatile and Most useful device, Especially for the Beginner
"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.
"Using Potentiometers as a Variable Resistors.",
You might want to check this out.
"Propane Leak Detector".
Can also detect Other Hydro-Carbon Gases.
"A Simple Switching Power Supply".
A Versatile and useful supply to Experiment with, Good for the Beginner to learn.
This is Direct 110 VAC input.
"A Good 12 Volt Switching Power Supply".
A Versatile and useful supply to Boost or Reduce the Battery voltage.
This Circuit Can drive Multiple Mosfets for Very High Power.
"Adjustable HV Output, 12 Volt Switching Power Supply".
The Output is Continuously Adjustable from about 20 to 190 Volts.
No Transformer needed, Just a Choke Coil.
"Transistor Preamp", Very Good.
A versatile, High Gain design. Can be Frequency compensatated for Various applications,
including Dynamic Microphones, Tape and Phono Applications.
Shown are Values for a "Flat" & "RIAA" response, but many others can be created.
"Proximity Detector".
Here is a Simple, But Very Effective One.
"Proximity Detector with HOLD Times".
Here is a another Simple Proximity Detector, but with added Features.
"Pulsed LED", A High Current Circuit.
Just to Play with, But it Might have some Practical Applications.
"PWM", A High Current Pulse Width Control,
They Work Excellent and Real Simple to build!
New and Revised Designs, NOW for Either "N" or "P" Channel Mos-Fet's.
A Ramping Circuit and Displaying on an LM3914
Could be used for a Turn Signal Indicator.
Also includes an additional Circuit and PCB for Driving Higher Power Lights.
An Inductance/Capacitance, Reactance Chart.
"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.
Plans for a "Shotgun Microphone".
Also with Tube Lengths based on 1/4 Octave Frequencies.
"Sine Wave Oscillator".
Here is a simple 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.
"Switching Supply, 12 Volt Strobe.
A "HIGH POWER STROBE", suitable for many applications.
"A Simple and Versatile Strobe Circuit" using 555's.
Good for both Lamps and High Powered LED's.
"A Simple and Versatile Strobe Circuit using Alternating Lights".
Good for both Lamps and High Powered LED's.
"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 REVISED, 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.
"Two Timer circuits, Adjustable On/Off Times, Using a CD4541B
REVISED & Very Useful for some applications.
"Timer's", Various, Using a 555
Some Useful Timers, as Requested by some of my Readers.
1) Apply Power, A Time Delay, than Permanent ON till power down.
2) Apply Power = Delay, than On, Delay off, On, Delay off & Repeating.
3) MORE COMING.
"FM Transmitter.
A simple 2 transistor circuit with a Coil on the PCB".
"Ultrasonic-1, Sound Detector.
Quite Sensitive & Useful to Detect Ultrasonic Sounds.
Now Revised for Either a 24 or 40 Khz Transducer.
"Ultrasonic-2 Sound Detector.
"SUPER SENSITIVE" for Detecting Ultrasonic Sounds.
Can be used with Either a 24 or 40 Khz Transducer.
"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.
"LED Voltmeters 20 & 30 LED's
Both Can be Switched to Bar or Dot Displays.
"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.
(I wanted to build this as a working unit, but due to health reasons, its not going to happen.)
"My Wire Table", as of April 2010
Here is a Wire Chart I Created and it should print about 8 1/2" * 11" @ 300 dpi.
Wire from "0000 to 46 AWG" and it also shows Wire size verses Skin Effects of AC Current.
FUN FOR ALL TO ENJOY
