Eight Ball Overdrive

[JimL]

I populated the PCB today. Got some help with one item: the 2sk209g orientation. FYI: I used an adaptor and did not consider the girth of a 220u cap. It was a tight fit and something to consider. I decided to go with the N4148 diodes that the build called for and I made no changes in the directions. There are quite a few components involved in this build and I am going to have it up on the PedalPCB auditorium platform tomorrow and then get it boxed up probably Monday because of the Superbowl tomorrow.

Right now I am deciding of my graphics choice here is too risqué. I see most people use the pool reference for their graphics.

It will be all gold, the footswitch, Stompbox powder coated enclosure, LED bezel, output jacks, and knobs. I am including images of my board and soldering..

 

[Robert]

FYI: I used an adaptor and did not consider the girth of a 100u cap. It was a tight fit and something to consider.

If you run into that issue again you can mount them vertically using right angle pins (or rigid solid core wire).

 

[JimL]

Well, I got it up on the platform didn’t work. Checked all the resistors and caps redid all of the solder. No time for further testing today because of that Super Bowl I got a party to go to. I did have trouble with one cap the 100 and in the upper right. So I gave that a little more attention. I had initially put the wrong cap there and had to really jag around to open up the hole so hopefully I didn’t damage the board too bad maybe that’s why it doesn’t work. I’ll certainly be back to this tomorrow.

 

[Robert]

Let's start with the easiest stuff first...

Did the LED light up?

Where did you get those MC33178 opamps?


Now I want to mount a battery on my Auditoriums.....

 

[owlexifry]

for what it's worth, you can actually just sub the JFET for a 2N5089 (or probably a 2N5088) and it doesn't sound any different. (per breadboard investigations).
it's just an input buffer.

Where did you get those MC33178 opamps?

good call.
maybe drop in something guaranteed genuine like a 4558 or whatever and see if it works (opamp choice isn't really critical to the sound)

 

[JimL]

Looks like I got them

Let's start with the easiest stuff first...

Did the LED light up?

Where did you get those MC33178 opamps?


Now I want to mount a battery on my Auditoriums.....

Yes, the light works. And you get a little bit of a extremely muffled sound. I haven’t tested it since I redid all the solder and I just checked where I got those chips from... Amazon. I got some good ones that I purchased from pedal PCB but I decided to try these Amazon ones because they were less work.The second image below shows the ones from PedalPCB and they just require a bit more fussing so I tried the others. What other chip you think I could stick in there? I do have many others and some I know are great. I have some 4558s that I will try tomorrow. They are from Stompbox.

Note: OK, I just got home. Put it back on the auditorium platform. If I put everything at 10, I get just some far away distortion.

 

[owlexifry]

I got those chips from... Amazon.

unfortunately buying opamps from amazon will be as likely to land genuine units as me shooting a 3-point basket blindfolded.

it's probably the only component type (ICs) in this entire game where using genuine parts matters.

please install some genuine opamps.

 

[Robert]

TL072 / RC4558 will work perfectly fine.

It may or may not sound identical, but it'll help you identify (or eliminate) your opamps as the problem.

 

[JimL]

unfortunately buying opamps from amazon will be as likely to land genuine units as me shooting a 3-point basket blindfolded.

it's probably the only component type (ICs) in this entire game where using genuine parts matters.

please install some genuine opamps.

Thanks. And looking at the images in the Amazon ad they are not the same as the chips

TL072 / RC4558 will work perfectly fine.

It may or may not sound identical, but it'll help you identify (or eliminate) your opamps as the problem.

I failed at a video, but I put the 4558s in, and it was the same. Odd that I turn everything on ten and the volume A100 only allows the pedal to spit out some sound once it gets turned to 9. Once I turn volume to ten I can here the other knobs controlling tone. It is not right and something is holding it back.