Amek BC315 Standalone Unit/BCIII Schematics

Sitai · Jan 10, 2016

I have an Amek BC315 channel strip that I am trying to make work as a standalone unit. I have figured out where my mic in and line out will likely be, but I am having trouble with the power section. From reading on an older forum it looks like the V+ Bus and V- Bus are the right pins, but I am unsure of what the correct voltage would be and which of the V+/V- pins to go to, since there are 4 of each.

Any advice or the schematics/technical manual would be extremely helpful.

Thanks in advance.

sahib · Jan 10, 2016

Pin configuration attached.

Sitai · Jan 11, 2016

Awesome, thank you! Most everything seems to be working, except I am having a strange problem where I cannot get a good output signal. I have tried every output I could think of, including L/R out, Subgroup Outs, Aux sends, Insert sends, and the direct out, but all I get is silence, until I turn the preamp gain almost all the way up, at which point I get an extremely treble-y and distorted signal. I'm pretty lost on what else to do. Do you have any ideas what this might be?

Itai

EDIT: Was finally able to make it work unbalanced from the Pre-fader Insert Send, now I just can't seem to get a balanced output, which I would like. Do you know which outputs should work balanced? Also, what does the Hi/Lo mean? In another schematic I saw it as Hot/Cold, which I know corresponds to the pins on a TRS or XLR cable. Hi/Lo makes less sense to me.

sahib · Jan 11, 2016

Hi-LO = HOT-COLD

I was going to post the schematic but it seems somebody had already posted it in the tech docs
http://groupdiy.com/index.php?topic=44846.0

andybaker28 · Jan 31, 2016

Hi there,

I have a Amek BC 3 that I use everyday! Love it. I am not sure in your case, but I have a few channels of BC 315 that I purchased separately after I got the console that have no output due to the fact that there is VCA automation on the channels. Same as you it does work in solo mode or pre fader out. I was told by a tech that for mine to work I need to either supply voltage to the automation of the channel or remove the automation from the circuit which would entail getting a new fader as well. The automation was a separate little pcb that was installed near the fader, hope that may help you…

These guys have one in their shop and know it very well.
www.audiomaintenance.com

Good luck!

Whoops · Feb 2, 2016

sahib said:
Hi-LO = HOT-COLD

I was going to post the schematic but it seems somebody had already posted it in the tech docs
http://groupdiy.com/index.php?topic=44846.0

Hello Sitai, see the link Sahib posted.
You're a new member, please always search first in the forum and visit the tech documents threads before asking.

Sitai said:
EDIT: Was finally able to make it work unbalanced from the Pre-fader Insert Send,

Yes, that's seem right it should be the best place to take an Output. Then feed it to a THAT1646 balancing board, you can use the SSL9K balancing pcbs for that, and then you have a balanced output to take to the XLR

Sitai said:
, now I just can't seem to get a balanced output, which I would like. Do you know which outputs should work balanced? Also, what does the Hi/Lo mean? In another schematic I saw it as Hot/Cold, which I know corresponds to the pins on a TRS or XLR cable. Hi/Lo makes less sense to me.

You will not get a balanced out you have to balance it yourself with a transformer or with a Balancing IC, THAT 1646 or DRV134.
Think about it, why would the output of the channel be balanced? It has to go down the bus rails, then sum with the other channels and only the balancing will only be made to the final Master stereo L/R Outputs.