12V LM350T Lead Acid battery charger question

khatus

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Hello friends, I want to make this lead acid battery charger.



Here, I want to use 1000pF polyester film capacitor instead of the electrolytic capacitor C3? My first question is can I use 1000pF polyester film capacitor instead of 1000pF electrolytic capacitor?



if i use the DPDT Self-Locking Push-Button Switch, in the place of the S1 Start pushbutton, will there be any problem?

 

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I have no idea why electrolytic is shown in the diagram, the part is not critical and any non-polarized capacitor should work.
Pin 1 is really for internal compensation and not intended to be grounded at all but I don't think any damage will occur if a latching switch is used. I think I would try adding a resistor (100 Ohms?) in series with the switch, if it still works it would be safer. Only in series with the switch, leave the capacitor between pins 1 and 8 or it might oscillate.

Brian.
 
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Will there be a problem if I use 15 ohm and 230 ohm 1/4 watt resistors? The value of these two resistors must be high wattage or low wattage? If it is high wattage then how much wattage should I use?
 

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I did a sim of grounding that pin, and sim showed no reak effect on output.
So my guess is Spice model not complete. Looks like Q9/10/12/13 off, so
output goes high allowing LM350 to function as 2A current source ? So
button must be momentary ?




Current thru R2/R3 limited by 15K R4, so low wattage should be fine.
 
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