Project Update, October 19, 2013.

[Gary Lecomte]

chemelec.com/Projects/Low-Ohm/Low-Ohm.htm

Added a Few More-----Chemicals and more, as shown in a 1917, "Practice of Pharmacy" Book.
chemelec.com/Projects/Chemicals/Chemicals.htm

Geiger Counter Project
chemelec.com/Projects/Geiger-Counter/Geiger.htm

Completed PCB, Ramping Circuit the displays with LED's
youtu.be/Sc6WsSQTk8U
Also a Short Video.
Possibly use this for a turn Signal indicator.

Prototype of a Ramping Circuit the displays with LED's
youtu.be/vwEJ_TiDfKk
A Short Video.
Possibly use this for a turn Signal indicator.

My NEW Battery Desulfator/R-Tester is Now Complete.
chemelec.com/Projects/Bat-Desulfator/2012-Desulfator.htm
Check it out.

New 4 channel, 12 Volt Color Organ for your vehicle.
chemelec.com/Projects/Color-DC/Car-Color-Organ4.htm

New 4 channel Color Organ for home use.
chemelec.com/Projects/Color-AC/Home-Color-Organ4.htm

Up/Down Counter Project Updated with More PCB's for 4, 5 or 6 displays.
chemelec.com/Projects/Counter-UD/Counter-UD.htm

Power Supply using an LM723.
chemelec.com/Projects/LM723-PS/LM723-PS.htm

25 LED Chaser, Sequencer, UPDATED
chemelec.com/Projects/Sequencer/LED-Chaser.htm

Headlight, Delayed OFF:
chemelec.com/Projects/Headlight/Headlight.htm

Conveyor Belt Metal Detector:
chemelec.com/Projects/Metal-AV/Metal-AV.htm

Loop Detector:
chemelec.com/Projects/Loop-Detector-2/Loop-Detector-2.htm

Propane Leak Detector:
chemelec.com/Projects/Propane/Propane.htm

AC Power Monitor:
chemelec.com/Projects/Pwr-Mon/Pwr-Mon.htm

After getting a few comments as to:
Is my website still being updated?

This is so people Will Know my site is still being updated regularly.

If anyone has IDEAS for Good ANALOGUE Projects, that Numerous persons will bennifet from:
LET ME KNOW.
And "I will see about Designing them".

[ka3trx]

Regarding the AC Power Monitor - Would it be difficult to increase the power handling capability to possibly switch on a dust collector (ShopVac) when a woodworking tool is turned on? Maybe with a relay?

BTW, love your projects site and forum! KA3TRX (Vic)

[Gary Lecomte]

Jun 26, 2011 20:28:12 GMT -8 ka3trx said:

Regarding the AC Power Monitor - Would it be difficult to increase the power handling capability to possibly switch on a dust collector (ShopVac) when a woodworking tool is turned on? Maybe with a relay?

BTW, love your projects site and forum! KA3TRX (Vic)

Yes you can replace the LED with a Relay.

[lamazoid]

nice headlight project, Gary! I like the simplicity of your circuit.
i have also developed automatic light switch, since from 2011 in Russia there is obligatory to turn on ligts ANY time you drive, no matter day on night. but my cricuit uses microcontroller and its more complicated to integrate it into car, since it acts like secondary control, allowing manually turn lights on and off, and also measures DC voltage to avoid discharging battery too much. i can post if anyone is interested..

[Gary Lecomte]

Hi Lamazoid, Thanks for the Good Comment:

Since My circuit Interupts the Power BEFORE the Light Switch, ;Dyou still have Manual Control of the lights with the Headlight Switch.

And if your car is running, hopefully your battery is Charging.
If Not your battery will go DEAD, Reguardless of the Headlights.
(Just not as Fast)

[lamazoid]

Actually, the 1st goal of making that circuit was getting rid of manual on-off lights during the daily drive. Almost all modern cars have sound alarm when light is on (while ignition is off and key is removed from ignition lock) , so its hard to forget it, but only newest ones will also automatically turn ON the lights.

[Gary Lecomte]

Well I specifically designed this for OLDER CARS.

And the Newer Cars that automatically turn on the Headlights (AT Least in NORTH AMERICA), "Only turn them on at About HALF Power for DayLight Running".
They only go to Normal Brightness when you actually Switch them on.

[Deleted]

I would like to build an EKG monitor. As you get older, you may find a need for one. Is there any circuitry that you could design that would help?

I built your fencer and it works well.

Thanks
thingy

[Gary Lecomte]

Dec 21, 2011 18:12:14 GMT -8 @thingy said:

I would like to build an EKG monitor. As you get older, you may find a need for one. Is there any circuitry that you could design that would help?

I built your fencer and it works well.

Thanks
thingy

I really doubt that is practical for in-home use.
It would be difficult for the average person to really determine the results correctly.

Just a Blood Pressure meter will probably give some better indications.

[Deleted]

I want to understand car mattery desulfator design,
Please guide me
Thankyou

[Gary Lecomte]

Sept 12, 2012 20:56:46 GMT -8 @majeed said:

I want to understand car mattery desulfator design,
Please guide me
Thankyou

What don't you understand?
The Desulfator part of the circuit is just a Power Oscillator.

But it is not so easy to Explain it all in Detail, in writing.
Especially when I don't know your Electronic Understanding?

[retiredat55]

Hi Gary, thanks for your updates!

I studied the new desulphator, but I have a question.
I don't see why you write (at R7) that the trickle charge depends
of the input voltage when you have a 12 V zener (Z1) on the power rail. Would the voltage not always be 12 V at R7?

Secondly, do you happen to get two ferrite rods for the sg coil left?
How can I order them?

Dante

[Gary Lecomte]

Oct 6, 2012 12:13:10 GMT -8 retiredat55 said:

Hi Gary, thanks for your updates!

I studied the new desulphator, but I have a question.
I don't see why you write (at R7) that the trickle charge depends
of the input voltage when you have a 12 V zener (Z1) on the power rail. Would the voltage not always be 12 V at R7?

Secondly, do you happen to get two ferrite rods for the sg coil left?
How can I order them?Dante

No, the Zener does NOT Maintain 12 Volts across the entire circuit.
If you look closely, you will see that the Zener is Only across the 555, And there is a 330 Ohm resistor to the battery negative.

Yes I have some Ferrite Rods.
You need to Contact me by Email for this.

[retiredat55]

You're right!
I didn't notice the 300 Ohm resistor there, sorry.
I built the "old" type of desulphator and was just curious to
see a new type.
Good idea that internal resistance indicator!

Dante

[akosiwilly]

is it compatible to intall a desulphator in parallel with voltage stabilizer in old car?