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Messages - willpirkle

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Amplifier Discussion / Re: Simple 3W amp IC? (for 4ohm speaker)
« on: January 21, 2021, 07:19:54 AM »
I’m using this TDA1517 stereo amp kit in one of my audio electronics classes. I built and tested it over Christmas and it is stable at 4 ohms. For $12 (Jameco, $27 on Amazon) it might be worth a try for your application. The output power will depend on the supply voltage and current capabilities.

- Will

The Newcomer's Forum / Re: Kustom 50-2 Amplifier /70’s
« on: December 07, 2020, 06:30:00 PM »
Have u tried these guys? no Kustom parts per se, but they’ve got a ton of pots for amps.

Amplifier Discussion / Re: Champion Amp Kit help needed.
« on: October 18, 2020, 08:17:16 AM »
Figure 6 shows the external volume pot as 10k-log for line-level sources.

Guitar News / Re: Puzzle shaped pedals to get rid of cables? Check!
« on: October 15, 2020, 06:54:53 PM »
I don’t know why I love this, but I do!

Schematics and Layouts / Scholz XPR -> XPRa Mod Instructions
« on: August 29, 2020, 01:40:13 PM »
I have heard that instructions for the XPR to XPRa mods are out there...somewhere... and that the mods are extensive.

TIA if you can hook me up

- Will

This might help:

All the best,
Will P.

Schematics and Layouts / Re: Scholz UDG Schematic
« on: July 01, 2020, 05:32:41 PM »
Yeah, there’s one on for $750 (WOW!) but I am interested in seeing the double clipping stages.

Schematics and Layouts / Scholz UDG Schematic
« on: June 29, 2020, 09:02:42 PM »
Has anyone traced out the Ultimatum Distortion Generator?

Amplifier Discussion / Re: Complete Rookie
« on: May 07, 2020, 10:37:44 AM »

Amplifier Discussion / Re: HH ic 100
« on: May 02, 2020, 05:29:28 PM »
Do u have the schematic?

Schematics and Layouts / Re: GK Indicator Footswitch
« on: May 02, 2020, 02:38:32 PM »
Boom! Thank you!!!

Schematics and Layouts / GK Indicator Footswitch
« on: May 02, 2020, 11:08:07 AM »
I haven’t contacted GK yet, but thought I’d ask here first — looking for the schematic for this GK footswitch used on the 112SC, 212SC, 150GT, etc from ~1980. The PCB inside is marked 50033B. The unit I received was DOA and someone disconnected the leads to the B channel switch at some point. I have a 112SC to test with.

Amplifier Discussion / Re: HH ic 100
« on: April 20, 2020, 10:19:48 PM »
I’d suggest drilling out the rivet that holds the band together, assuming you can fit a drill bit in there, and replace with a nut/bolt. I mention it because I just drilled out a seized screw in a GK400RB two days ago, after trying just about everything else. Super frustrating.

EDIT: you may also be able to use a diagonal cutter to slice through the rivet.

Schematics and Layouts / Re: Peavey Mixer: PV8USB Schematic and Repair
« on: April 09, 2020, 09:17:16 PM »
Thanks for your posts! - this is a great forum (I’m relatively new) and a wealth of information here.

Amplifier Discussion / Re: Feng - Mini Amp using PAM8403 (2x 3 Watt)
« on: April 07, 2020, 06:37:55 PM »
Have a look at the NSC (now TI) “Boomer” series LM468x amplifiers. I worked on the test systems for those parts, and I could not believe how much useable power we wrenched out of +5V. We debuted them at an AES show, with a guitar “amp” we made with 4 of them (4W) all running on a 9V battery and VReg, inside of a little plastic box with belt clip. For a 5V platform, these were awesome. I think they still make a few of the models now, all smd tho.

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