hey guys
i am waiting for my arduino MEGA to arrive in a few days.
i need to switch a bunch of LM1876's op amps on/off. they have mute pins that mute the signals passing through by receiving 2.5v.
so i figured i could use the arduino pins to switch an array of amps on/off.
however, my question is - do i need to put some kind of resistors inbetween or something to avoid drawing too much power/frying my arduino while muting 10+ LM1876's??
i should add, by default ALL AMPS WOULD BE MUTED AT THE SAME TIME - meaning id continuously be sending 5v through at least 10+ pins most of the time.
also, another question - i have never tried the LM1876's mute function - its instantaneous, right? im building a musical instrument, so if the mute function is delayed, its useless.
thanks!
-ú
i am waiting for my arduino MEGA to arrive in a few days.
i need to switch a bunch of LM1876's op amps on/off. they have mute pins that mute the signals passing through by receiving 2.5v.
so i figured i could use the arduino pins to switch an array of amps on/off.
however, my question is - do i need to put some kind of resistors inbetween or something to avoid drawing too much power/frying my arduino while muting 10+ LM1876's??
i should add, by default ALL AMPS WOULD BE MUTED AT THE SAME TIME - meaning id continuously be sending 5v through at least 10+ pins most of the time.
also, another question - i have never tried the LM1876's mute function - its instantaneous, right? im building a musical instrument, so if the mute function is delayed, its useless.
thanks!
-ú
thanks guys,
is the mute function instantaneous? does it mute the IC right away?
thanks,
ú
Some datasheets offer this information...this one does not.
You will have to test the response time and adjust your arduino accordingly.
Let us know the results.
You can find the location of mute B in the datasheet too.its just 5v to pin 6 and ground, right?
hey tauro
im worried the mute pin might draw to much power from the arduino. the I/O pins of the arduino are limited to 40mA / 20mA reccommended!
and for some reason i cannot get the mute pin to work anyway, using a 5v battery to mute pins and ground. weird huh?
plus i need a latency free mute switch, and im not sure if the LM1876 mute pin works instantly... does anyone have experience with this chips feature?
im worried the mute pin might draw to much power from the arduino. the I/O pins of the arduino are limited to 40mA / 20mA reccommended!
and for some reason i cannot get the mute pin to work anyway, using a 5v battery to mute pins and ground. weird huh?
plus i need a latency free mute switch, and im not sure if the LM1876 mute pin works instantly... does anyone have experience with this chips feature?
Hi,
Just to let you know that I am using a NANO micro to control the speakers output and also the mute of my LM3886 amplifier. Since the mute in the LM3886 it is negative and for isolation I am using a solid state relay LH1546. It worked with no noisy whatsoever.Just clean in the ON/OFF.
Just to let you know that I am using a NANO micro to control the speakers output and also the mute of my LM3886 amplifier. Since the mute in the LM3886 it is negative and for isolation I am using a solid state relay LH1546. It worked with no noisy whatsoever.Just clean in the ON/OFF.
hey, thanks for all the replies!
maybe i can switch the signal on/off before the LM1876 - if i where to use this IC :: http://semicon.njr.co.jp/eng/PDF/NJM2521_E.pdf
can someone help me draw a schematic that flips a low power signal on/off with my arduinos digital pins?
thanks,
úlfur
maybe i can switch the signal on/off before the LM1876 - if i where to use this IC :: http://semicon.njr.co.jp/eng/PDF/NJM2521_E.pdf
can someone help me draw a schematic that flips a low power signal on/off with my arduinos digital pins?
thanks,
úlfur
and for some reason i cannot get the mute pin to work anyway, using a 5v battery to mute pins and ground. weird huh?
No, not weird, if you're using a single supply. In which case you need 1/2 the supply voltage +2.5V to achieve mute.
Hi,
At the beginning I was unable to follow the circuit since you over look that pin 1 it is the one with the square. You have to turn around the socket or leaving it like it is just cosmetic. Are you trying to switch audio no? I was thinking that you was trying to mute the LM1876. The NJM2521 what it does is to select one output from three inputs. I just want to verify that were are in the same track.
At the beginning I was unable to follow the circuit since you over look that pin 1 it is the one with the square. You have to turn around the socket or leaving it like it is just cosmetic. Are you trying to switch audio no? I was thinking that you was trying to mute the LM1876. The NJM2521 what it does is to select one output from three inputs. I just want to verify that were are in the same track.
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