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Can you measure the frequency?
With the 470K, 22K and the .0022 cap, It Should be about 1275 Hz.
Not that the Frequency is Very Important in this circuit.
Also this circuit will Discharge the Battery, so if it is desulfated for a long Period, it can do more damage. So you must also keep it charged up.
And Unless the battery has been Under-Charged or Left Un-used for a Long period of time, it is Not Usually Sulphated.
Most batteries are Just OLD and have BAD Cells.
Desulfators Can't Fix that.
yes..the frequency is close to what you said, to be exact it is 1.4KHz, i haven't noticed but i guess the components
have some tolerance, the battery i want to desulfate it is not a total mess, it can hold a charge but after one day it
can no longer feed a starter, it is only able to turn one lights and stuff like that.
First off you should not be trying to make this on a bread board. They may be fine for digital stuff but they are vary unpredictable for analog stuff.
You should at least take your high power components off it and solder them together in open air.
Glade to here that. How much current can you put thru stuff on a breadboard?4pyros, I Only Build Analogue stuff and I have NEVER had any problems using Breadboards or on any measurements on them.
Glade to here that. How much current can you put thru stuff on a breadboard?
Your FET is not turning on and/or all the way. It maybe a bad connection with the high power parts on your bread board.
Take them off and solder them together.
The Signal at the Battery is Being LOWERED in VOLTAGE Because of the Batteries Low Impedance.
The Coils do Not change the Actual Frequency, But they Highly Distort the Waveform.
So your Frequency Counter is Probably NOT Giving a Correct Frequency Reading at the battery.
You need an Oscilloscope to really see what is happening.
The Frequency you get at Pin 3 Is the Actual Frequency.
I looked at the 555 circuit and it is supposed to be on for about 750 us, then off for about 33 us, so the pulses where inductor is on are only 33us in duration, during which time the inductor's current should increase only to about 400mA. In theory, this should be fine. So, 5A rating that I suggested earlier might be an overkill and the inductor rated for 600mA - 1A should be fine, but the 100mA inductor would definitely saturate. If it saturates, you get high currents and something will go.
Another question is whether you get the 95% duty cycle that it is supposed to produce at pin 3 or not? Can you measure the duty cycle?
As a quick fix, I would try decreasing R2 to 10K and then further to 4.7K. This would make "on" pulses shorter while keeping the frequiency, so you can get away with smaller inductor.
I wouldn't change the capacitor. It's probably chosen to set the frequency believed to be good for the desulphation.