Start with a gemsbok loin (rugstring), nicely matured, cubed. Bacon is good. Some dried apricots, soaked in water for a few hours (also soak the skewers so they don’t burn). Some blanched onion, and some cherry tomatoes (it helps to work things out ahead of time, I had 8 skewers, 24 cubes of meat, 16 apricot halves, 16 tomatoes and 10 rashers of bacon cut into thirds. Some sosaties got more bacon, some got less onion).
Drizzled with olive oil & rosemary sauce.
Add a green salad and half a butternut wrapped in foil and put on the coals much earlier, and call it Sunday night supper.
Oooh look! Someone threw out this perfectly good Spectrum SPL-603 power supply!
Well, mostly perfectly good…
The 723 had given up all its magic smoke, to the point where the socket is also buggered. Fortunately this is a stock part in my junkbox, as are 2N3055s (the one output transistor was shorted emittor-to-collector, but I can’t explain why this would break the 723). I also replaced the H1061 with a BDW93B because I could.
Truth be told, this is a terrible PSU.
So why the high non-regulated DC? I thought maybe it drops under load because cheap transformer, but this is not the case. The transformer gives out 38VAC which drops to 35VAC with a 1A load.
The general schematic is similar to http://www.circuit-projects.com/cimg/2V_to_7V_8A_power_supply_by_723_and_7812.gif but with a difference — the base of the current limiting transistor is connected to a voltage divider (R4/R5) to ground. This causes the current limiting point to be higher for a higher output voltage. Again, counter-intuitive.
So I changed things around to how it should be. Fitted a different transformer, from an old UPS — it’s only good for about 18V out but that’s enough for me. Not going to try to make a purse out of this sow’s ear.