Orbitronics Regulated Amplifier FA-5657/1

GroupDIY Audio Forum

Help Support GroupDIY Audio Forum:

smilan

Well-known member
Joined
May 29, 2017
Messages
340
Hi, I'm looking info / schematic of this Orbitronics Mic Preamp Regulated Amplifier FA-5657/1.
What can you tell me about it?
 

Attachments

  • s-l1600 (11).jpg
    s-l1600 (11).jpg
    331 KB · Views: 0
  • s-l1600 (10).jpg
    s-l1600 (10).jpg
    164.6 KB · Views: 0
  • s-l1600 (9).jpg
    s-l1600 (9).jpg
    209.5 KB · Views: 0
  • s-l1600 (13).jpg
    s-l1600 (13).jpg
    505.7 KB · Views: 0

mjrippe

Well-known member
GDIY Supporter
Joined
Dec 27, 2011
Messages
2,915
Location
Brooklyn, NY
Military, or Federal Aviation (FA). I think I owned one at some point but it was a long time ago. There are some sites that have docs for this sort of stuff, but it can be hard to sort through as they may be listed as part of a complete system.
 

smilan

Well-known member
Joined
May 29, 2017
Messages
340
Thanks, I've been searching the internet for info on this unit and could not find anything useful. Do you remember what should be the supply voltage for it?
 

mjrippe

Well-known member
GDIY Supporter
Joined
Dec 27, 2011
Messages
2,915
Location
Brooklyn, NY
I do not recall. Look for ground and power traces, then find the capacitor that connects them. If it is a 35v cap, then try 24VDC, if it is a 25v cap then try 18VDC, etc. Also check the orientation of the cap - these are early enough that they could be postive ground!
 

Latest posts

Top