PwrSupply: Rectifier Substitution B40C800 for DB104

MIDIbox SID
1

Can I substitute a DB104 rectifier for the B40C800? Reason I ask is that my source did not have any and said the DB104 should work… Below are the links to the spec sheets… Forgive me I am not so knowledgeable on these compnents…

DB104

http://www.ortodoxism.ro/datasheets/RECTRON/DB104.pdf

B40C800

http://www.ortodoxism.ro/datasheets/wte/B40C800.pdf

Thanks…

2

It looks like it would probably work, but assuming you already have a SID PCB, it would be more trouble than it’s worth because the pinout is different.  The normal round rectifier used has AC “inputs” at opposite corners, while the device you suggest has both AC inputs on one side.  This would mean you’d need to do some “bendy legs” tricks and use some extra wire, and it would probably be a mess.

If you don’t have the prescribed regulator, you could easily make do with four 1N4001 diodes, wired to the terminals as shown in the SID module schematic.  (If you look at the rectifier in the schematic, it’s drawn as 4 diodes, which is all a full-wave rectifier really is).

If you are already 100% certain you are running DC on to the SID board, and you are careful enough to ensure you have the correct polarity (+ to + and - to -), you could even omit the rectifier entirely, and just use a couple of little jumper wires in its place.

3

If you are building your own PSU its fine, I used a DB105 on my psu.

But as Nebula said, the pinout and footprint is different so you can’t use it as a drop in on the mbSid pcbs

4

I took the pin out config in consideration of the DB104…

here is the following Voltage readings that I get…

5.11 V between grd (- side of 100nf cap) and pos (+ side of 100nf cap)

7.96 V between grd (- side of 100nf cap) and 220 ohm resistor (for led connection)

1.12 V between grd (- side of 100nf cap) and pin#3 7809 regulator

13.12 V between pin #1 and pin #2 of the 7809… Not sure why that is but can I assume to tap off of that connection for my 14 V feed?

C64 PS outputting 5.11 VDC and 9.8 VAC which is correct…

Thanks for the previous replies…

In the meantime I’m going to check my connections and the voltage output of the C64 power supply that I have…