Hello,
I made LM3915 Vu meter which is working fine, however i have some problems.
I used this schematic:
http://users.otenet.gr/~athsam/vu_meter_4.htm
At R1 I used 10Kohm potentiometer and for input I connected 3.5mm jack.
When I connect my VU meter to my laptop it lights up to 4 LEDs, so I have to connect it to my speakers (which gives higher volatage, as I understand) and only then I can light up all LED's, however I need to be able to light it up from laptop.
Can anyone recommend me any amplifier circuit that would be easy to fit up into this schematic and would solve my problem?
Also my dot-bar switch doesn't work, when I switch it on/off it changes only brightness of LED for some reason, but it still is in bar mode.
I made LM3915 Vu meter which is working fine, however i have some problems.
I used this schematic:
http://users.otenet.gr/~athsam/vu_meter_4.htm
At R1 I used 10Kohm potentiometer and for input I connected 3.5mm jack.
When I connect my VU meter to my laptop it lights up to 4 LEDs, so I have to connect it to my speakers (which gives higher volatage, as I understand) and only then I can light up all LED's, however I need to be able to light it up from laptop.
Can anyone recommend me any amplifier circuit that would be easy to fit up into this schematic and would solve my problem?
Also my dot-bar switch doesn't work, when I switch it on/off it changes only brightness of LED for some reason, but it still is in bar mode.