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Try connecting a 1/8” stereo jack as follows: Tip (left) to pins 3 and 5 Ring (right) to pins 1 and 9 Ground (sleeve) to pin 13
Also, I used a 10K pot to limit the sub, although this didn't work as I expected. I connected the left audio channel to pin 3 of the pot, pin 1 of the pot to ground, and pin 2 of the pot (middle pin) to pin 2
of the DB15.
And finally, ground pins 6,7 & 8 to ground (pin 13). The center channel is unused. Tweak the pot until the bass sounds right. Note that the sub will suck
power out of one of the channels and I haven't bothered to figure out why.
When you are done soldering (I did all of this inside the sub box, drilling 1/4" and 3/8" holes for the
audio jack and pot), hot glue everything so that the sub woofer doesn't shake it loose. I do not know what pins 11 and 12 are. They have 100 ohm impedence to ground and a DC offset of
0.140 mV. Remember that there is no volume control on this, so when you are testing it, start low. Do no use "line-out" to drive this, use the head-phone out so that you have volume control on your iPod or
whatever. I connected the 3 "enable" pins to ground and it worked for, ie the amp went from standby/idle mode
with zero output to a decent output level. |
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发表于 2019-11-23 15:26
