Bo Deadly
Well-known member
As usual I'm goofing around in LTSpice again.
I got a little battery powered mic pre that has an LDR limiter in it. I was thinking the circuit that turns on the LED in the LDR is a little slow so just for kicks I thought I would try to make a circuit that turns it on a little faster. Here's what I came up with:
The plot is of current through the LEDs of the LDRs in the stock circuit and then the circuit on the right which is supposed to be faster, better, stronger, ... At 10dBu the 650uA is about where the LDR would kick it if it were not for the feedback mech of the limiter which is of course not modeled here so the level would have to be quite a bit higher to actually get to 650. But the model is good enough to compare.
Improvements, criticism, comments and general musing is welcome and appreciated. If you know of a better way, now is the time to share your secrets!
I got a little battery powered mic pre that has an LDR limiter in it. I was thinking the circuit that turns on the LED in the LDR is a little slow so just for kicks I thought I would try to make a circuit that turns it on a little faster. Here's what I came up with:
The plot is of current through the LEDs of the LDRs in the stock circuit and then the circuit on the right which is supposed to be faster, better, stronger, ... At 10dBu the 650uA is about where the LDR would kick it if it were not for the feedback mech of the limiter which is of course not modeled here so the level would have to be quite a bit higher to actually get to 650. But the model is good enough to compare.
Improvements, criticism, comments and general musing is welcome and appreciated. If you know of a better way, now is the time to share your secrets!