sir, I'm Arya, from Indonesia, I've read all your good article, but can you help me to design an Linear PSU that provide 12 vdc 5A output from 220vac, but it must also charge a 60Ah Lead Acid car battery at 5Ah, but when blackout(no 220vac supply) DPDT relay will switch to use battery to light 50watt 12vdc light bulb for incubator heater and it's 12vdc electronic thermostat. when 220vac supply on again dpdt switch will use PSU to light heater, and the will charge the battery.
this is my available electronic component in my inventory:
1. 1x Big Trafo 220v to 30v 25Amps
2. 1x LM317T IC
3. 2x 7812 IC
4. 4x TIP41C
5. 2x 2N3055
and assorted diodes and resistor and of course i have 2 dpdt relay
i also have few mosfets like IRF540, and 18N50, but i don't know how to use it.
i also have 4 of, 5 watt 0,1 ohm resistor, and the charger that I wanted to build, can it have automatic cut off, so I can leave the battery forever on the unit, and all of that spare parts that I already mentioned before was salvaged material, but has been tested and everything was seems OK,
for the small capacitor i can manage to find it, if there are any.
o yeah, that transformer that i mentioned before already have 25 v 3300uF capacitor, and it's big 30 Amps rectifier( it's look like 4 legged transistor that have a sign look like this - ~ ~ + is that right?, a rectifier?) both of it soldered with cables, near the trafo.
can you help me sir?, please, lights out in Indonesia is often happen especially here in eastern Indonesia, in Mollucas Islands.
Thank you before sir. Arya.
The idea is intended to ensure an uninterrupted supply of warmth to an incubator chamber regardless of the presence or absence of the mains grid voltage.
Referring to the above design of the proposed emergency incubator lamp with charger circuit, we can see a straightforward layout consisting of a transistorized voltage regulator stage formed by a Darlington paired 2N3055/TIP41 BJTs and an opamp based battery over voltage, lower voltage cut off stage.