Hi All,
I've recently completed the zero point micro 2 board, hooked it up to my basic test rig (rock before box) and the effect doesnt work!
Sound is making its way through the pedal, but all the pedal seems to produce is a rythmic noise: the volume of the noise increases with the mix pot, but no other pots appear to do anything.
the only part substitution: i used a 78L05 in place of the LM78L05 listed in the BOM of the pedal (see link)http://www.banzaimusic.com/78L05.html
I've checked for solder bridges and cold joints: everything seems to be OK. I socketed the ICs and regulator, so I dont think there is an issue with them
Does anyone have any suggestions
Thanks
Hi,
it seems that there is a mistake in the schematic. The DGND (pin 4) of the PT2399 is never tied to ground.
So, if you tie it to ground (or pin 3), it should work.
Steve
There's no mistake in the schematic. Pin4 is tied to ground internally to Pin3 inside the IC via a 10R resistor.
schweltzer, if you are using a 7805 regulator you need to flip it around. The pinout is opposite of the LM78L05.