Bar-graph display ?

There is a circuit for a bar-graph display,

http://www.aaroncake.net/circuits/vumeter.htm

The circuit has a diode between the input an pin 5
amd is described to have an input range of 0 to 1
Volts.

My question is wouldn't the input range have to
start at 0.6 Volts due to the diode ?

 

[cpemma]

<davidca@btinternet.com> wrote in message
news:bg120a$1ap$1@hercules.btinternet.com...

There is a circuit for a bar-graph display,

http://www.aaroncake.net/circuits/vumeter.htm

The circuit has a diode between the input an pin 5
amd is described to have an input range of 0 to 1
Volts.

My question is wouldn't the input range have to
start at 0.6 Volts due to the diode ?

Yes, but the diode isn't needed, the 3915 can handle the negative-going part

of the wave without false output.