Hi,
Im considering trying to make a lever meter for my electric guitar signal, despite being very new to electronics. Very rough idea is to send the signal to a buffer amplifier, then use a load of comparators referenced to a resistor ladder to power leds so they light up in sequence as the signal gets stronger. Would prob also need rectification at some point to get to dc. Is this a reasonable way to go about it or not?
Anyway I found a lm741 opamp at home so decided to play around. Using 9v supply and a potential divider to provide the signal, I managed to get it to voltage follow by directly feeding back but only down to about 1.5-2v, the output would not go below that. I think the range I need to be looking at is 0 to 1v, maybe even 0 to 0.5v. Is this something to do with offsetting (or is this just compensating for inaccuracy in the opamp and of no use to me), or do I need an opamp that goes down to ground so I can get down to the range I need? If so what would be suitable? The LM358N perhaps?
Appreciate any help!
Thanks.
Im considering trying to make a lever meter for my electric guitar signal, despite being very new to electronics. Very rough idea is to send the signal to a buffer amplifier, then use a load of comparators referenced to a resistor ladder to power leds so they light up in sequence as the signal gets stronger. Would prob also need rectification at some point to get to dc. Is this a reasonable way to go about it or not?
Anyway I found a lm741 opamp at home so decided to play around. Using 9v supply and a potential divider to provide the signal, I managed to get it to voltage follow by directly feeding back but only down to about 1.5-2v, the output would not go below that. I think the range I need to be looking at is 0 to 1v, maybe even 0 to 0.5v. Is this something to do with offsetting (or is this just compensating for inaccuracy in the opamp and of no use to me), or do I need an opamp that goes down to ground so I can get down to the range I need? If so what would be suitable? The LM358N perhaps?
Appreciate any help!
Thanks.