In article ,
Dave Plowman (News) wrote:
When building a split rail low current PS with discrete components - like
say +/- 15v - does it matter if the transformer doesn't have a centre tap
on the secondary? It's just that I've seen circuits for both around. Some
say to omit the centre tap connection to ground even if it has one.

It depends on what you are trying to power. If the device simply wants a
30v supply, then the centre tap isn't needed. If the requirement is for
+15, 0, -15 then you are going to have to get the 0 reference from
somewhere. It can be done in the load device with suitable circuitry, but
it's much easier to use the centre tap.

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