PSU design?

[Karl ALEXANDRE]

> 723 !
> 
> JH. 


	2 weeks ago, I made tests before building my +/-15v supply for my modular.
	I used a 723 with a balast transistor. The circuit was wired on those
	white lab board (the ones 2 array of 5 vertical holes). It worked very fine
	a very few mV ripple at 15v loaded with a big 12R resistor. It worked fine
	so i made a nice pcb to group the positive and negative supply. I used large
	trace for ground, unreg and reg voltage. 
	What a disapointment ! on the pcb version i get an horrible ripple, several 
	hundred mV ! there is ripple everywhere... I really don't hunderdtand why !
	Same componement were used for the preliminary test and the final soldered
	version.
	
	I use this nice regulated ( :( ) supply for my drilling machine :)

	

				Karl
	
	PS: I re-designed the digital board of my 303 clone, for rack mounting. I now 
	includes a command panel. At the end of the week end i hope it will finished. 
	Planed functionnality : internal sequencer, midi control, sysex dump of the
	patterns.