Hi Guys
I built the circuit below as it pretty much met my requirements and expected, even with my little knowledge of electronics to modify it fairly easily, but have failed.
I have replaced the LEDs with 3 high intensity LEDs in series on each channel and upped the supply voltage to 9 volts so they reach maximum brightness.
As standard, at minumum sensitivity FSD is around 90dB and I need to increase this to 120dB but still leave maximum sensitivity FSD at around 75db, which it is a present.
Additionally the spread from LED1 to LED5 is around 15dB and I need to reduce this to around 7.5dB.
Any help would be greatly appreciated.
Thanks
Mike
I built the circuit below as it pretty much met my requirements and expected, even with my little knowledge of electronics to modify it fairly easily, but have failed.
I have replaced the LEDs with 3 high intensity LEDs in series on each channel and upped the supply voltage to 9 volts so they reach maximum brightness.
As standard, at minumum sensitivity FSD is around 90dB and I need to increase this to 120dB but still leave maximum sensitivity FSD at around 75db, which it is a present.
Additionally the spread from LED1 to LED5 is around 15dB and I need to reduce this to around 7.5dB.
Any help would be greatly appreciated.
Thanks
Mike