Hi. Building an amp intended for LCR duties with 3 NC500MP modules. Was looking to add a trigger input but also wanted the option to run the amp without trigger. In an attempt to simplify the design I got the idea if I could tie all 3 GND (J6.4) together and use VAUX (J6.1) from one amp to control PS Enable (J6.9) on all 3 modules. Would this work or would it destroy them?
Attachments
A circuit diagram would help in case of readymade modules.
In my opinion. it maybe better to use the processor trigger only for remote muting (vs. turning off) the amplifiers so that any pops and clicks are suppressed.
In my opinion. it maybe better to use the processor trigger only for remote muting (vs. turning off) the amplifiers so that any pops and clicks are suppressed.
That was also considered and in the manual it says the startup of the amp is delayed and muted so there should be no pops. Attached is the manual for reference
It should not be a problem if the amplifiers share the same grounds. However, if you're concerned, you could run 3 optocouplers (with the diodes connected in series), fed from the pre / processor aux power supply. The transistor sides of the optos could then run from the aux power of the respective module without issues.
3 optocouplers was my first idea but I wanted to simplify that. Since I also want to have the option of running the amp without the trigger (see crude sketch in first post) I got to thinking if I could run them as one amp. My problem was finding a chassis mounted mechanically operated switch to bypass the trigger. I've been able to find one with 2 contact to do the job. Space is scares so want to keep component count and size down
Come on man, 3x6N137 and it's clean output !! Easily available and gives digital output from 5V supply.
The bypass is easy to implement. The normal condition of the amps should be set to 'ON' using a pullup resistor. Whenever the processor is starting up , loading filters, or making changes to settings etc. the amp maybe temporarily disabled using the trigger that pulls down the enable.
In short, turn only the amp on, the amp would turn on. Turn on the processor before that, it won't.
The bypass is easy to implement. The normal condition of the amps should be set to 'ON' using a pullup resistor. Whenever the processor is starting up , loading filters, or making changes to settings etc. the amp maybe temporarily disabled using the trigger that pulls down the enable.
In short, turn only the amp on, the amp would turn on. Turn on the processor before that, it won't.