We're going to start recording to tape again but our desk lacks metering on all the channel outs so i'm looking into adding a basic LED output meter for each channel.
We'll need to know levels going to tape but the machines VU will be out of sight.
The only place to fit them is next to the channel faders so i can either tap off directly post fader inside that module or tap off after the (post fade) direct out level control.
(But that would mean routing the signal back down the desk to the fader module.)
The LM3915 looks to be a simple solution but i'm wondering if i need an additional buffer where i'm tapping off post fader.
Its data sheet shows a buffer on the input of the chip, is this sufficient or do i need extra buffering to leave the audio untouched?
I found this api circuit on the forum which looks very close like what I'm after.
5 LEDs is perfect really.
http://www.classicapi.com/catalog/images/gallery/3124/1987-era-3124-schemo.pdf
Possibly this will be ok as is?
Attached is the circuit after the fader.
We'll need to know levels going to tape but the machines VU will be out of sight.
The only place to fit them is next to the channel faders so i can either tap off directly post fader inside that module or tap off after the (post fade) direct out level control.
(But that would mean routing the signal back down the desk to the fader module.)
The LM3915 looks to be a simple solution but i'm wondering if i need an additional buffer where i'm tapping off post fader.
Its data sheet shows a buffer on the input of the chip, is this sufficient or do i need extra buffering to leave the audio untouched?
I found this api circuit on the forum which looks very close like what I'm after.
5 LEDs is perfect really.
http://www.classicapi.com/catalog/images/gallery/3124/1987-era-3124-schemo.pdf
Possibly this will be ok as is?
Attached is the circuit after the fader.