tag:blogger.com,1999:blog-3465922128874862400.post3339289654222937439..comments2024-03-28T04:34:13.466-07:00Comments on Coda Effects: Ground loops and guitar pedalsCoda Effectshttp://www.blogger.com/profile/11269924772680602439noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-3465922128874862400.post-65404245070107366162020-09-17T02:43:14.346-07:002020-09-17T02:43:14.346-07:00Thanks for a very informative mail..
I know next t...Thanks for a very informative mail..<br />I know next to nothing about electronics apart from the internal workings of guitars...<br />I have a stranger problem than the example you gave...I am trying to wire together a selector pedal that will allow 3 loops and a master bypass switch. The idea is to use this as a vehicle to learn habit more about how pedals work, and I need to create a less jumbled pedal board sound.<br /><br />I found a couple of online suggestions, but neither is working for me.<br />1. http://ashleyjsaunders.com/blog/build-true-bypass-loop-pedal/<br />I am using example 4. but with only three loops. I noticed that he has a mistake (?) in the right hand stomp switch, that the ground to the LED and the return to the master bypass switch are swopped…or?<br /><br />2. https://www.premierguitar.com/articles/the-diy-true-bypass-lesson-1<br />i am using the three switch diagram and adding a master bypass.<br /><br />I don’t read proper schematics, so need a more graphic visual aid…<br /><br />After three or four attempts at this simple (?) rig, doing both as suggested and then trying to figure out why they arn’t working, I am somewhat frustrated. <br />I have managed to get the master bypass running with two loops, but not the last, or the master bypass with the last loop working.<br />My uneducated guess is that I’m screwing up on creating the ground connections correctly.<br /><br />My last attempt I separated the led circuit completely from the loop wiring…more wire but simpler to trouble shoot…still didn’t help. LEDs work perfectly but still only 1st loop (master bypass working consistently)<br /><br />I don’t have the skills to look at the diagrams and see where the potential problem lies.<br /><br />I am using a 12 volt loop for the LEDs, with Leds that have inbuilt 12volt capacitors.<br /><br />I have learnt a lot, but it would be nice to get a working solution. I was assuming that if all the grounds are connected in a star or broken circle, this should work?<br /><br />Any suggestions?AlbertNhttps://www.blogger.com/profile/03593870106813083941noreply@blogger.comtag:blogger.com,1999:blog-3465922128874862400.post-83857304508915454562019-03-02T17:18:06.993-08:002019-03-02T17:18:06.993-08:00A few points not mentioned:
1. A ground plane is ...A few points not mentioned:<br /><br />1. A ground plane is an intentional design choice, not a lazy one, If you work for a engineering manager they will fight you or dictate that multilayer is too expensive. An inner layer gnd plane is recommended, not an outer layer as reviewing skin effect at higher frequencies such as radio frequencies are a culprit of unintended ingress especially if outer layers are not designed as a clam shell with a single reference for all planes and boundary stitching. Connect IC pins, bypass caps is a common mistake in mitigating EMI issues.<br /><br />2. If a good part placement is made and you place your return paths immediately below forward paths you achieve minimum impedance whether it be a trace or ground plane. You can achieve minimum resistance while crossing paths which is not recommended. Having a gnd plane along with a power plane allows for interplane capacitance which is a distributed capacitance and provides low impedance bypass and effective for HF suppression.<br />Mike Joynerhttps://www.blogger.com/profile/02596732822768701271noreply@blogger.com