There was one part which I wasnt able to get and that was the B40C800 bridge rectifier. I tried making my own one out of diodes but it made my head hurt. First attempt at building it was a massive failure so I decided to start from scratch today and have been much more successful.
It didnt help that it seems the more visual schematic I was using had the 5v+ pin on the power marked wrong. A bit of prodding with the multi meter soon sorted out that problem.
Giving up on making a bridge rectifier out of diodes I used a DB104 bridge rectifier, which is rated slightly higher (.2amps and 60v) than the B40800 but this is just a max rating so Ive been advised by nILS that this should be fine.
There is one rather unusual thing, in that on the 14v power line Im getting 9.02v. When I put the multi-meter on the output of the bridge rectifier I get just over 12v. Im not sure if maybe the bridge rectifier is dropping 5v out of it somehow,but I thought that would generate quite a bit of heat, and the bridge rectifier doesnt seem to be getting hot. Becuase the power before the rectifier in the circuit is AC I cant really measure it properly to see what the supply is outputting.
Now as I will be using an 8580R5 SID chip the SID power only needs to be 9v. This would normally be regulated by a resistor on the SID module board but Im wondering if now I can just leave that resistor out. I will have to talk to one of the more learned on Midibox.org to see if anyone has any ideas.
I have tried 2 different power supplies, and even though one of the power supplies makes a disturbing buzzing noise, I get the exact same voltage out of it.
Its progress at least, my soldering is getting alot tidier with all this practice and Im getting pretty decent at de-soldering :)
Click the pic for more.
No comments:
Post a Comment