adding simple overload LEDs to input channels
« on: November 27, 2004, 04:59:56 PM »
MY new API 7800 and 8200 line mixer has a pre-wired connection for outboard meters for the stereo bus.  But there are no meters or LEDs of any kind on the 8 input channels.  I will be using this rig on location in a variety of situations, and there are times when I might be able to hear that there is a problem, but not be able to immediately identify where its coming from.   In that situation, something as basic as a single overload LED indicator on each of the 8ch would be very helpful.

Two questions:

* where to tie into the 8200/7800 system (I'll ask API on Monday)
* DIY or purchase the 8ch LED box?

Has anyone out there ever done anything like this?  Or have a better idea?

Thanks.
Steve
Lexington 125  - High Resolution Location Recording

[email protected]
www.lexington125.com


Flatpicker

adding simple overload LEDs to input channels
« Reply #1 on: November 27, 2004, 07:14:20 PM »
A really cool and simple signal/overload circuit for the API would be to use one like shown in this Rane MS b1 schematic: http://www.rane.com/pdf/ms1bsch.pdf

Looks like you could just Connect the 3rd 75ohm secondary of the output transformer to the points marked ?OL1? and ?OL2? and you?re done. The bi-colored LED will turn green when the signal is present and red when an overload occurs. Even runs off the same +/- voltage as the API.


 

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