Hi
I've salvaged a 40 0 40 transformer from an old sub-woofer and would like to construct a bench supply whilst I'm sat twiddling my thumbs.
I've loads of LM317s and 2n3055s so was hoping I could use them to make a two output supply. Can I do that with the transformer I have or does it have to be 2 separate windings? Also, looking at 317 specs I suspect the input voltage (once smoothed with the huge caps that were in the sub's supply) might be too high. How can I pull it down 'simply'?
I've salvaged a 40 0 40 transformer from an old sub-woofer and would like to construct a bench supply whilst I'm sat twiddling my thumbs.
I've loads of LM317s and 2n3055s so was hoping I could use them to make a two output supply. Can I do that with the transformer I have or does it have to be 2 separate windings? Also, looking at 317 specs I suspect the input voltage (once smoothed with the huge caps that were in the sub's supply) might be too high. How can I pull it down 'simply'?