Hey,
I'm having real trouble understanding the whole VU meter, dB(and associated suffixes), Vrms caper - even after reading the great threads here that covers such subjects and also googlin various info from here n there...really isnt clicking on how I should go about setting stuff up - I know it should but i'm a simple soul when it comes to basics...
First off this is G1176 specifc as I want to calibrate it all proper and make sure the meter is behaving as it should etc..
So to begin with and rather then asking 1001 q's and waffling on I'm just gonna ask a q at a time to make sure I understand the process at it progresses...
Right then, 1st q:
Before using the meters I should first make sure they hit 0VU with a 1.23Vrms input signal right (When measuring the voltage i'd have the dmm set to VAC and look for the 1.23V ye?)? So from my soundcard output (600R balanced) I tie pin 3 to 1 and this goes to the meter - input, pin 2 goes to the meter + input via a 5k trimmer connected in series. Then I apply a signal and trim till I get 0VU. With the resistance measured on the pot this is the value resistor I'd use inplace of the 3K6 resistor on the 1176 pcb...?
Meters I'm using are the 500mA SM14's with a diode bridge added...
Once i get this part I can start calibrating this thing proper I hope...
Thanks
I'm having real trouble understanding the whole VU meter, dB(and associated suffixes), Vrms caper - even after reading the great threads here that covers such subjects and also googlin various info from here n there...really isnt clicking on how I should go about setting stuff up - I know it should but i'm a simple soul when it comes to basics...
First off this is G1176 specifc as I want to calibrate it all proper and make sure the meter is behaving as it should etc..
So to begin with and rather then asking 1001 q's and waffling on I'm just gonna ask a q at a time to make sure I understand the process at it progresses...
Right then, 1st q:
Before using the meters I should first make sure they hit 0VU with a 1.23Vrms input signal right (When measuring the voltage i'd have the dmm set to VAC and look for the 1.23V ye?)? So from my soundcard output (600R balanced) I tie pin 3 to 1 and this goes to the meter - input, pin 2 goes to the meter + input via a 5k trimmer connected in series. Then I apply a signal and trim till I get 0VU. With the resistance measured on the pot this is the value resistor I'd use inplace of the 3K6 resistor on the 1176 pcb...?
Meters I'm using are the 500mA SM14's with a diode bridge added...
Once i get this part I can start calibrating this thing proper I hope...
Thanks