bram

API 512c pinout: mic input on which pins? (yes i've rtfm)
« on: January 31, 2008, 11:46:43 AM »
Hi all:
I do not fully understand the pinout for my API 512C preamp. I read the information provided by API:
Pin 1 CHASSIS GROUND
Pin 2 OUTPUT + (+4 LEVEL)
Pin 3 OUTPUT + (-2 LEVEL)
Pin 4 OUTPUT -
Pin 5 COMMON
Pin 6 525 STEREO LINK
Pin 7 INPUT- (-2 LEVEL)
Pin 8 INPUT- (+4 LEVEL)
Pin 9 INPUT+ (-2 LEVEL)
Pin 10 INPUT+ (+4 LEVEL)
Pin 11 GAIN TRIM RESISTOR
Pin 12 +16VDC
Pin 13 POWER SUPPLY COMMON
Pin 14 -16VDC
Pin 15 +48VDC
Now, I know that the first Aphex and API lunchboxes would let you choose between high and low level input and output, which would explain originally the 3 output pins and the 3 (or even 4?) input pins. Now I had some (dummy) questions:
- is there still a way to choose level in the new lunchboxes? I assume the default level is +4
- As I understand, according to http://www.apiaudio.com/b512c.html the API 512b has (-) input on pin8, and the API 512c on pin7. If I make a preamp card for myself, do I NEED 4 pins for the input (+ground on pin5) or is 2 pins (one (+) on 9 or 10 and one (-) on 7 or 8 sufficient?
Sorry if this sounds silly.

regards,
Bram


 

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