Im trying to work out a metering solution for the fred forssell opto limiter project and its brought up some greater questions about gain reduction in general.
Directly, how does the left deflection of the VU meter in an 1176 in GR mode work? Ive looked at the metering circuit a bit and really cant translate the schematic into a working understanding of whats happening there. Im guessing that the circuit presents a voltage to the meter when at rest, when the limiter kicks in, the fet just drops the voltage to the meter?
Assuming this is how it works, could I use the optocoupler present in the forssell circuit to work in place of what the fet is doing in the 1176 circuit?
Im most used to gain reduction metering like that and would really like to incorporate it on a VU meter on the forssell project. I wired a VU as shown in fred's original schematic and get right deflection, so thats not too much use. Im guessing I could graft the 1176 meter circuit onto the forssell project, but would like to try to understand how it works before kludging something together in a shotgun method.
If anyone can suggest perhaps a simpler circuit or a better solution, that would be beyond cool.
dave
Directly, how does the left deflection of the VU meter in an 1176 in GR mode work? Ive looked at the metering circuit a bit and really cant translate the schematic into a working understanding of whats happening there. Im guessing that the circuit presents a voltage to the meter when at rest, when the limiter kicks in, the fet just drops the voltage to the meter?
Assuming this is how it works, could I use the optocoupler present in the forssell circuit to work in place of what the fet is doing in the 1176 circuit?
Im most used to gain reduction metering like that and would really like to incorporate it on a VU meter on the forssell project. I wired a VU as shown in fred's original schematic and get right deflection, so thats not too much use. Im guessing I could graft the 1176 meter circuit onto the forssell project, but would like to try to understand how it works before kludging something together in a shotgun method.
If anyone can suggest perhaps a simpler circuit or a better solution, that would be beyond cool.
dave