Harry Dalek wrote:I feel looking at it again and your advice i think i will stick to the 2 diode idea ..
As I mentioned, it's fine for moderately light loads, and those where the drain on the two DC supplies are relatively equal. But if you have an large imbalance on the positive and negative supply load you end up with effectively DC passing through the transformer windings. This can lead to saturation of the transformer core leading to more heat - not good.
I repeat, "Get the right transformer for the job." Never skimp on power supplies, without them meeting the challenge your whole project is doomed.
I could quote Hans Summers from his website (http://www.qrp-labs.com), except I cant find the exact passage right now, but it's basically this...many failures or poor performance of our kits are simply down to poor power supplies...(he goes on to elaborate).
Steve A.