Hi all
Been using solar panels to charge SLA batteries for ages, running domestic mains lamps converted to use 12v multi-LED modules in my home. Now I'm ready to go a step further, having a decent amount of stored electricity I want to invert up to 220v AC for laptop power and other light uses.
I havent done any electronics for a long time but used to be capable as a teenager (I'm 33) of building radios and the like from loose components and some of the knowledge remains
This circuit looks promising - seems plausible and not too hard for me to make
12v to 220 transistor inverter using darlington pairs and 2n3055s
Most of the parts are silly-cheap on eBay but I dont like the look of the BD140 PNP power transistor used to drive the base of the 2N3055 output transistors: It says it must be cooled but its a TO-216 / SOT32 format which is difficult to heatsink. (too small, and the sinks are rare)
If I use a TO-220 package TIP32C transistor in its place would the circuit still work as intended? I dont properly understand the gain calculations as they would be applied to a darlington pair driver circuit, the maths is a bit beyond me but it appears the TIP32C has roughly equivalent specs but at a higher power
Would it then need less cooling and last longer / run cooler ? Or would putting a higher power rated part there unbalance the circuit, needing different resistances to get the right power on the final drive to the 2N3055 ? (which will be both on big heatsinks)
Massive thanks in advance from this amateur.. I'm here to learn
Been using solar panels to charge SLA batteries for ages, running domestic mains lamps converted to use 12v multi-LED modules in my home. Now I'm ready to go a step further, having a decent amount of stored electricity I want to invert up to 220v AC for laptop power and other light uses.
I havent done any electronics for a long time but used to be capable as a teenager (I'm 33) of building radios and the like from loose components and some of the knowledge remains
This circuit looks promising - seems plausible and not too hard for me to make
12v to 220 transistor inverter using darlington pairs and 2n3055s
Most of the parts are silly-cheap on eBay but I dont like the look of the BD140 PNP power transistor used to drive the base of the 2N3055 output transistors: It says it must be cooled but its a TO-216 / SOT32 format which is difficult to heatsink. (too small, and the sinks are rare)
If I use a TO-220 package TIP32C transistor in its place would the circuit still work as intended? I dont properly understand the gain calculations as they would be applied to a darlington pair driver circuit, the maths is a bit beyond me but it appears the TIP32C has roughly equivalent specs but at a higher power
Would it then need less cooling and last longer / run cooler ? Or would putting a higher power rated part there unbalance the circuit, needing different resistances to get the right power on the final drive to the 2N3055 ? (which will be both on big heatsinks)
Massive thanks in advance from this amateur.. I'm here to learn