Just try them on the buffer output with diodes fitted on buffer to see if they work and do 1dB steps to see if the lineup to the scale or not and let me know what you find.
But the meter should work on the audio line as that is what they were designed to do but they add distortion so a buffer is the best way to isolate the distortion.
Hey Joe, finally found tine to build. All done. All works. Even put 2 variable resistors and a switch so I can switch between 2 dB levels.
But I did 1dB steps as you suggested and it doesn't line up to the scale.
Just try them on the buffer output with diodes fitted on buffer to see if they work and do 1dB steps to see if the lineup to the scale or not and let me know what you find.
But the meter should work on the audio line as that is what they were designed to do but they add distortion so a buffer is the best way to isolate the distortion.
Hey Joe, finally found tine to build. All done. All works. Even put 2 variable resistors and a switch so I can switch between 2 dB levels.
But I did 1dB steps as you suggested and it doesn't line up to the scale.
OK good to hear you got it working. If it is one of the old type ebay etc meters with old 12v lamp the scale isn't correct or it just doesn't need the VU2 buffer rectifier. As you go down 1dB steps is the needle showing more or less dB?
Moved your posts from our Stereo VU meter build thread to correct Vu2 Build thread.
Just try them on the buffer output with diodes fitted on buffer to see if they work and do 1dB steps to see if the lineup to the scale or not and let me know what you find.
But the meter should work on the audio line as that is what they were designed to do but they add distortion so a buffer is the best way to isolate the distortion.
Hey Joe, finally found tine to build. All done. All works. Even put 2 variable resistors and a switch so I can switch between 2 dB levels.
But I did 1dB steps as you suggested and it doesn't line up to the scale.
OK good to hear you got it working. If it is one of the old type ebay etc meters with old 12v lamp the scale isn't correct or it just doesn't need the VU2 buffer rectifier. As you go down 1dB steps is the needle showing more or less dB?
Moved your posts from our Stereo VU meter build thread to correct Vu2 Build thread.
Just try them on the buffer output with diodes fitted on buffer to see if they work and do 1dB steps to see if the lineup to the scale or not and let me know what you find.
Hey Joe, finally found tine to build. All done. All works. Even put 2 variable resistors and a switch so I can switch between 2 dB levels.
But I did 1dB steps as you suggested and it doesn't line up to the scale.
OK good to hear you got it working. If it is one of the old type ebay etc meters with old 12v lamp the scale isn't correct or it just doesn't need the VU2 buffer rectifier. As you go down 1dB steps is the needle showing more or less dB?
Moved your posts from our Stereo VU meter build thread to correct Vu2 Build thread.
Just try them on the buffer output with diodes fitted on buffer to see if they work and do 1dB steps to see if the lineup to the scale or not and let me know what you find.
Yes try one side with no rectifier mod and see if it track better.
Ok, pulled off all 4 diodes and put 2 jumpers on D1 & D4.
Now the VU's don'e work at all...
Im only getting 0.8mV across the + & - of the 'M' terminals.
Ok, pulled off all 4 diodes and put 2 jumpers on D1 & D4.
Now the VU's don'e work at all...
Im only getting 0.8mV across the + & - of the 'M' terminals.
OK your meters do not have any rectifier in them then. The closest you will get is to what you had with diodes on the VU2 before you removed the them as the scale is not calibrated to the meter coil in your meters.
Ok, pulled off all 4 diodes and put 2 jumpers on D1 & D4.
Now the VU's don'e work at all...
Im only getting 0.8mV across the + & - of the 'M' terminals.
OK your meters do not have any rectifier in them then. The closest you will get is to what you had with diodes on the VU2 before you removed the them as the scale is not calibrated to the meter coil in your meters.
But there is no voltage coming from the 'M' + & - now though. Is this how it's supposed to be?
Ok, pulled off all 4 diodes and put 2 jumpers on D1 & D4.
Now the VU's don'e work at all...
Im only getting 0.8mV across the + & - of the 'M' terminals.
OK your meters do not have any rectifier in them then. The closest you will get is to what you had with diodes on the VU2 before you removed the them as the scale is not calibrated to the meter coil in your meters.
But there is no voltage coming from the 'M' + & - now though. Is this how it's supposed to be?
Yes without the rectifier it will be AC volts going to the meter. With rectifier on VU2 then the meter will get DC.
OK your meters do not have any rectifier in them then. The closest you will get is to what you had with diodes on the VU2 before you removed the them as the scale is not calibrated to the meter coil in your meters.
But there is no voltage coming from the 'M' + & - now though. Is this how it's supposed to be?
Yes without the rectifier it will be AC volts going to the meter. With rectifier on VU2 then the meter will get DC.
Ok. That makes sense.
I've just done a test on my SEW ST-475's with your original mono VU buffers and they don't scale to 1dB increments exactly either.
Ive been mixing TV shows with Pro Tools for about 9 years on these and they are fine. I'm wondering if properly scaled ones will make a difference.
But there is no voltage coming from the 'M' + & - now though. Is this how it's supposed to be?
Yes without the rectifier it will be AC volts going to the meter. With rectifier on VU2 then the meter will get DC.
Ok. That makes sense.
I've just done a test on my SEW ST-475's with your original mono VU buffers and they don't scale to 1dB increments exactly either.
Ive been mixing TV shows with Pro Tools for about 9 years on these and they are fine. I'm wondering if properly scaled ones will make a difference.
Unless you are using the meters for calibrating system it doesn't make any difference.
Yes without the rectifier it will be AC volts going to the meter. With rectifier on VU2 then the meter will get DC.
Ok. That makes sense.
I've just done a test on my SEW ST-475's with your original mono VU buffers and they don't scale to 1dB increments exactly either.
Ive been mixing TV shows with Pro Tools for about 9 years on these and they are fine. I'm wondering if properly scaled ones will make a difference.
Unless you are using the meters for calibrating system it doesn't make any difference.
Yeah cool.
I mixed the Perth A League last night from NEP's HUB and used the VU's. They went well. Mixing a TV show today for Amazon from my home studio. Will see how it goes...
I did notice that the right meter doesn't have same scale as the left. 1dB increments are ok and mostly to scale on the left but not the right. Would that be component tolerances?
I've just done a test on my SEW ST-475's with your original mono VU buffers and they don't scale to 1dB increments exactly either.
Ive been mixing TV shows with Pro Tools for about 9 years on these and they are fine. I'm wondering if properly scaled ones will make a difference.
Unless you are using the meters for calibrating system it doesn't make any difference.
Yeah cool.
I mixed the Perth A League last night from NEP's HUB and used the VU's. They went well. Mixing a TV show today for Amazon from my home studio. Will see how it goes...
I did notice that the right meter doesn't have same scale as the left. 1dB increments are ok and mostly to scale on the left but not the right. Would that be component tolerances?
The buffers once set to a gain are perfect amps and we never see difference between even cheap meters left to right.
The only tolerance would be the meters or if one of the BAT85 has gone open circuit so not fully rectifying.
Easiest way to prove were the problem is. Swap the meter plugs over on the VU2 pcb and see if fault stays with meter or VU2 channel.
I’ve just finished the assembly of the VU2 kit,
Meter lights work, meters move very slightly on turn on,
But,
No response to input signal.
I’m using balanced inputs driven for testing with a Neutrik Minirator.
+4 DB gives nothing, I’ve adjusted the trim pots and still nothing.
Any suggestions on where to start trouble shooting?
Also what sort of voltage would I expect to measure from the meter outputs ?