Okay, So I've been reading the forums and gaining as much knowledge as possible. I set out to do my first project. Its a guitar splitter with two transformers for running two separate amps with a DI out as well. Heres the schematic.
http://www.geofex.com/FX_images/splitter.gif
So I've got it all put together and I'm getting a decent signal when playing through it but Also getting a really loud hum. With the power off the hum is gone, also when the guitar volume is turned down the hum is gone as well. Touching the strings makes an audible difference in the hum as well.
Does this on every output jack including the DI, same exact hum from each, so this tells me either a grounding issue or something with the opamp right?
I'm using a 2134 instead of a 134 so I just grounded the input pins of the unused side of the opa.
I've got +9 and -9 on pins 8 and 4 respectively. I've got 0v at the output pin on the opamp.
I checked my resistor values again and all look right. Only thing I can think of is that for the 2.2mF cap, I ordered this http://mouser.com/Search/ProductDetail.aspx?R=ECW-F2225JBvirtualkey66720000virtualkey667-ECW-F2225JB
which is a 250v and seems way overkill by the size of it. I went ahead and put it in but I'm wondering if this is causing my hum.
Should I get a smaller voltage cap and replace it?
Thanks and excuse my noobishness, I'm still learning and want to get some good practice before I start on bigger projects.
http://www.geofex.com/FX_images/splitter.gif
So I've got it all put together and I'm getting a decent signal when playing through it but Also getting a really loud hum. With the power off the hum is gone, also when the guitar volume is turned down the hum is gone as well. Touching the strings makes an audible difference in the hum as well.
Does this on every output jack including the DI, same exact hum from each, so this tells me either a grounding issue or something with the opamp right?
I'm using a 2134 instead of a 134 so I just grounded the input pins of the unused side of the opa.
I've got +9 and -9 on pins 8 and 4 respectively. I've got 0v at the output pin on the opamp.
I checked my resistor values again and all look right. Only thing I can think of is that for the 2.2mF cap, I ordered this http://mouser.com/Search/ProductDetail.aspx?R=ECW-F2225JBvirtualkey66720000virtualkey667-ECW-F2225JB
which is a 250v and seems way overkill by the size of it. I went ahead and put it in but I'm wondering if this is causing my hum.
Should I get a smaller voltage cap and replace it?
Thanks and excuse my noobishness, I'm still learning and want to get some good practice before I start on bigger projects.