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July 07, 2020, 11:22:32 PM

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11
Preamps and Effects / Re: Zoom g1xon and diy guitar amp based on lm386
« Last post by Oooscar on July 04, 2020, 06:09:01 AM »
Just to share with you...

I have tried the g1xOn with a generic TDA7297 stereo amp board bought on eBay, and I can get louder volumes without the squeal... (I am bit experimental... But it seems you can get nice volume and sound in a cheap DIY way) I have been told as well that cheap pickup coils can also contribute to produce that squeal, due to microphonic effects. Wax potted ones have less microphonic effect. In the future I will try better pickups also.
12
Amplifier Discussion / Re: Speaker switching
« Last post by Psc on July 03, 2020, 11:11:55 PM »
I wasn't going to do aby because I'm making them into heads.  I should have clarified that. What I was thinking was more like having my clean effects y off to the jc120, then all dirt pedals to the peavey. I just want one 212 cabinet for the whole affair though.
13
Amplifier Discussion / Re: Speaker switching
« Last post by Enzo on July 03, 2020, 10:42:28 PM »
For that matter, using the existing speakers in those two combos, a readily available ABY switch on the front end would work too, wouldn't it?

You are right, we need to isolate the speaker grounds.  The Peavey speaker return is NOT to ground, it has a current sense resistor there.  I don't have JC120 handy, but the similar JC77 does reference speakers to ground.  But still, even if both went to ground we might create a ground loop if connecting them.


When you described the project, I immediately got a mental picture of how I would do it, your inner vision is diffrent, but I bet yours will work too, and if it differs by one relay, so what.   I have a very lengthy history in relay systems - think old pinball machines and other control systems - and I think certain ways, but it ain't rocket surgery.
14
Amplifier Discussion / Re: Speaker switching
« Last post by Psc on July 03, 2020, 09:47:26 PM »
It's probably unnecessary, it's true, but I have most of the stuff on hand. So I have it set up to switch the positive and the negative, but I probably have to keep the rings separate from each amp, do I not? I would imagine you need to keep each power supply isolated.
15
Amplifier Discussion / Re: Speaker switching
« Last post by Enzo on July 03, 2020, 08:57:34 PM »
It shouldn't matter if either amp sits unloaded, so how about one DPDT relay per speaker?  Or for that matter a single 4PDT.

The commons go to the speaker terminals, then the throws go to jacks from either amp.

My personal view: seems kinda hard core to switch between those two amps in the middle of a song.
16
Amplifier Discussion / Speaker switching
« Last post by Psc on July 03, 2020, 07:09:54 PM »
Hello all.  Hopefully this is the right place to ask this.  I have two solid state stereo chorus amps, a peavey stereo chorus and a jc120, and I had a thought to use them both with the same speaker cabinet and make a foot switch so I could do it on the fly.  I came up with a schematic that involves six relays. It works very much like a reversing starter.  You push the button for the peavey, it seals in a relay that closes the contacts for the speaker output for that amp and disables the jc120 relay.  To change you hit a stop button, then hit the jc120 button.

I want to do all that to prevent the outputs of the amps from connecting.  I am wondering if this is safe, and more importantly is there anything I haven't thought of.  I expect I'll need three separate plates to mount the jacks, one for each amp and one for the output so that the negatives won't be connected?

If there's a reason I should abandon this please let me know. It's one of those things that I couldn't stop thinking about.
17
Amplifier Discussion / Re: Pignose 7-100 fizz
« Last post by tonyharker on July 03, 2020, 06:21:46 AM »
See here:
https://sites.google.com/site/pignose7100/ and

https://slowbean.net/thread/pignose-7-100-from-70s-with-germanium-transistors/?tagid=4180,4700,4958,5204,5217,5225,5240,5378,5905,6237,6830,7244,7413,7585,7655,7717,8306,8308,8390,8438,9188,9311,9327,9329,9556,9804,9828,9864,10059,10081,10199,10200,10292,10403,10404,10484
18
Amplifier Discussion / Re: Pignose 7-100 fizz
« Last post by phatt on July 03, 2020, 03:25:44 AM »
I'm not in the know about that amp but I'd guess the circuit is basic and the fizz maybe just the way they come.
Being a basic unit, Crossover Distortion of the power stage is likely the issue.
If you can dig up a schematic for that amp and post it, others here might be able to help tweak the circuit for you.
Phil.
19
Amplifier Discussion / Pignose 7-100 fizz
« Last post by Bluesman90 on July 01, 2020, 11:03:07 PM »
Hello friends! I recently purchased a Pignose 7-100 but I can't get good clean sounds as there is some fizz in the background. Is this normal in the Pignose? Is there a way to fix this fizz?
I am attaching a video where you can hear this fizz.

https://youtu.be/_ewFZHYTvT8
20
Schematics and Layouts / Re: Scholz UDG Schematic
« Last post by willpirkle on July 01, 2020, 05:32:41 PM »
Yeah, there’s one on reverb.com for $750 (WOW!) but I am interested in seeing the double clipping stages.
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