My first CORE is done no 5 volt???

MIDIbox SID
1

Hi all!

Iam kind of new here but I need some help? I have soldered my first CORE for my SID synt. When I put 9V AC into it I dont get 5V on J2, only something like 2.3V. Half ov what it should be. I am all new to this. But I think my 7805 is to blame.

First try to power up i put the 9V AC onto J2 (only for a short time!!!)

IC1:MCLR(1) - IC1:Vss(12) = 2.3V

IC1:Vdd(11) - IC1:Vss(12) = 2.3V

IC1:Vdd(32) - IC1:Vss(31) = 2.3V

IC2(8) - IC2:(5) = 2.3V

I could be my voltage meter thats crap but it messures the  9V from power supply OK!

Please help a guy out!!

Mattias

2

Could it be, that you have placed the regulator “backwards”?

Bye, Moebius

3

Dont think so? How can I tellIt is the same way as in the pictures. But it gets really hot!!

Mattias

4

Ok,

If the metal part of the regulator is facing towards PIC, it’s ok.. Then it’s probably short circuit somewhere. Do a visual inspection of the solderside..

Bye, Moebius

5

:smiley: :smiley: :smiley: Thanks there was a bad solder (short circuit). It was hard to spot. This was the first thing I ever soldered so the solderside looks like shit but I think I got it right now!!!

Thanks ../Mattias