Dayton Audio SA100 Subwoofer amp

[speedmadness]

New to the Forum, and looking for some help on an old Dayton Audio SA100 Subwoofer Plate Amp. Found this amp in some old stuff I was cleaning out and I cannot determine where the actual speaker lead outputs should be. There are no leads to hook up to the Sub coming off of the amp. Does anyone have a schematic that would show what I am missing here? Thanks.

 

[llwhtt]

The + speaker lead should be connected to one side of the big copper coil, no idea where the - lead goes, ground somewhere. Need closer shot of the amplifier PCB.

Craig

 

[speedmadness]

Thanks, Craig. GND seems pretty straightforward, there is an obvious pin on the pcb. The power lead off the coil, not so much. The wires that are already on there seem a bit sketchy to me. Not sure that heat shrink and soldering are as it was delivered from Dayton. Would love to see a schematic or photos of another one.

 

[Ian Finch]

As Craig pointed out, the output from the power amp. board has to come from one side of the coil and that would be the one connected to the adjacent fuse, then the other side of the fuse connects to an output pin which I think is most likely the PCB pin sticking up next to the fuse. You'll notice the similar ground pin for the speaker, I think.

Why not use a meter to check for continuity between there and the fuse, then recheck after pulling the fuse to prove the circuit. Check there's no DC there either (which could be the reason the connection is removed) then give it a little audio and connect a speaker from that pin to ground and verifry that's correct.

 

[speedmadness]

Many thanks to Craig and Ian. I found a pair of pins on the PCB, p1 and p2. P1 has continuity to the fuse next to it, which has a feed from the coil going to it. Hooked up an old speaker to the pins and powered it up with some signal. Seems to work great. On to phase 2 ... I have a Vifa 10" Sub and this plate amp ...