Andy Evans wrote:

I'm appalled by the number of DC power supplies I have to build to
feed the filaments of the DHTs I use (directly heated triodes), which
need one supply per tube ideally. I'm using up loads of voltage regs
in the process, and wondered which ones "members of the panel" favour.
Typical supply is a 60VA 0-12, 0-12 transformer, then on each
secondary Schottky bridge, 15,000uf cap, 12v voltage reg and an
adjustable reg confugured as a current source. Typical requirement is
7.25v at 1.25A (10Y), but there's also 2.5v at 1.75A (46) and 5v at
1.25A (300b).

I'm using LM1084 at present, but sneaking in some 78S12 because
they're cheaper. LM1084s have gone up recently, so also interested in
cheaper suppliers than Farnell.

So - which voltage regs are your fave choices here? Good quality
output important, but cost also a consideration. This looks right up
Jim's street for starters.

Dare you use a switching regulator ?

Graham