The transformer needs to be placed before the full wave bridge rectifier.  The second diode is not necessary, unless it was intended as part of the snubber circuit, in which case it would be reverse biased, shunted across the output. 

The input fuse should be somewhere around 2A, SB.

Regards,

Scott W7SVJ

From: [email protected] <[email protected]> On Behalf Of Windows XD
Sent: Saturday, August 12, 2023 20:10
To: [email protected]
Subject: [GreenKeys] Building my own power supply

Dear Greenkeys community,

I'm trying to build my own power supply for my Teletype model 19, it needs 120-130VDC of power @ 830Ma. I'm working on a circuit for it, but I don't exactly know what I am doing because I've never done this before. Would you let me know if I am on the right track to building a switching power supply? 

P.S. I know it needs a snubber circuit somewhere and none of the actual switching circuitry is there, I don't know enough to know what goes where.