kazuviking
Member
- Joined
- Sep 5, 2022
- Messages
- 9
- Likes
- 0
I built a super simple class a hp amp and wondering how big of a trafo do i really need. The BOM states that a 25 or 50VA transformer is needed but when i measure the current draw its 110(+-10)mA on both positive and negative rails. Currently i run it from a 150W trafo(14-0-14V) that i salvaged from an old surround amp but its way to big in size and the other windings are not in use. Everywhere i read people suggest that you need way oversized one even if it barely draws any current. From my simple calculation it draws 3.2W on both rails so would a 4.5VA or 7VA 2x12V suffice?
Other info: The amp have its own super simple zener+transitor reg and the transformer have a full bridge after it. The current transformer is way too big and it don't fit into my small enclosure.
Any help is appreciated.
Other info: The amp have its own super simple zener+transitor reg and the transformer have a full bridge after it. The current transformer is way too big and it don't fit into my small enclosure.
Any help is appreciated.