Nordcore wrote:
That one should work.
Just measured my build with a (somewhat larger) 16V transformer:
transformer idle: 3W
with phaser: 7W max.
... so your 18V/500mA (=9W output) transformer should be OK.
One wire of the jack goes to one AC pin, the other to the GND pin. The other AC pin on the the PCB is not used.
Fuse should be 500mA slow blow. (Only one used/needed!)
(The second AC just gives less ripple. As there is plenty of filtering in the input it is not really needed...)
Apologies to Nordcore, but I don't see how the circuit that Jürgen published will work properly with a single transformer winding.
A single transformer winding will only power one of the regulators in the circuit. If you are lucky, and power the +15V regulator and the circuit may partially work, but most of the op-amps in the circuit need 2 rails and without modifications the circuit won't work as designed (you would have to short the -15V rail to ground, then the front panel lamp wouldn't work and you would have to bias the op-amps to pass a full AC signal, so not a good compromise).
If you are taking the trouble to build a top of the range phaser like this, don't compromise on critical parts like the power supply, use the right parts. In this case, either use a dual winding external transformer like the PA-20 mentioned, or use a dual winding internal transformer and take proper care in setting up the correct safe mains connections and fuses. Other people in this thread have already identified suitable internal transformers.
Just my opinion of course, but I think I am right in this case.
[Edit]
Now I am really confused, as the photo's on Jürgens site only show a single winding connected.
I obviously need to look into this a bit more.
For DonaldHarper, it might be worth checking if your transformer connections are the same as Jürgens photographs.
[\Edit]
Regards
Magman
