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#amplifier

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A-wai :debian:

And finally, here are the 2 devices in situation: the 2-way switcher on my vintage stack (on the right of the OR15), and the 6-way one on my modern stack (between the Soldano and the red A-wai amp) 🙂

All amplifiers are now permanently wired and ready to rock, I just have to plug my guitar, power the amp(s) on and use the switcher to select the one I'll be playing 🎸🤘

6/6

A blue 2x12 cabinet with a blue/grey grillcloth, with a blue vintage-styled A-wai Custom Amps head on top, and an Orange OR15 head on top of the latter. On the right, there's a small black box (the amp switcher).
A small 1x12" cabinet on the left of the picture, on top of which are stacked a Soldano amplifier head, the 6-way amp switcher (looking like a thin black box), a red snakeskin A-wai amp head, a Peavey 6505 MH and a Warwick Gnome. The right of the picture shows a blue-ish grey vertical 2x12" cabinet with a A-wai amp head of the same color on top of it.
#Guitar#Amplifier#DIY
Public
A-wai :debian:

Amp switcher: the build 🧵

Background story: fosstodon.org/@awai/1140938655
Project overview: fosstodon.org/@awai/1141105471
Relays array board: fosstodon.org/@awai/1141504390
Control matrix board: fosstodon.org/@awai/1141844996

I went with Hammond 1441 series enclosures, as they're made out of steel and can therefore bear the weight of a few tube amplifiers stacked on top.

This made drilling difficult (especially the holes alignment), so I'd recommend going with aluminum cases if possible.

1/

A black steel box, drilled with 15 holes, with most of them being obviously mis-aligned to some extent. The box sits on top of an old newspaper, with carboard panels on the background for avoiding metal projections across the room.
#Guitar#Amplifier#DIY
Public *
A-wai :debian:

I got the "Amp Switcher" PCBs in the mail a few days ago 😀

As I plan on building both a 6-way and a 2-way switcher, I ordered boards (5 of each) for the larger size only. The "relays array" board is 2oz copper and has a slightly different color.

The photos also show a "control matrix" board resized to 2-way switching (bottom right); this is easily done by hand using brute force, although I suggest using pliers to ensure it's all cleanly cut.

Closeup on a blue printed circuit board, showing details of the silkscreen.
Blue printed circuit boards in front and on top of a white cardboard box labelled "PCBWay".
Blue printed circuit boards in front and on top of a white cardboard box labelled "PCBWay".
#Guitar#Electronics#Amplifier
Public
Matt

Some time ago, #Elecraft stopped making the 100W #amplifier module for their #K2 kit radio. However, all is not lost, as the #KXPA100 solid-state switching amplifier designed for their KX3 radio can work great with the K2, after a small mod to the K2. I describe this mod in the blog article linked below. As a result, I can send #CW on my K2 at 100W with silent switching and full QSK. The KXPA100 is equipped with a 100W ATU, giving full flexibility regarding the antenna.

teachmaths.org/20140420_elecra

Matt's Musings · Elecraft K2 Amplifier Keying CircuitI have been building an Elecraft K2 kit radio , and I completed construction this Easter weekend. When I ordered the kit, I didn’t order the internal ATU or the 100W amplifier option, as I already have an Elecraft KXPA100 amplifier with KXAT100 ATU . However, this amplifier is designed to work with the KX3 radio, and so to get it to work with the K2, I would need to build up a keying circuit.
Public
A-wai :debian:

Amp switcher: control matrix design 🧵

Background story: fosstodon.org/@awai/1140938655
Project overview: fosstodon.org/@awai/1141105471
Relays array board: fosstodon.org/@awai/1141504390

Now for the final part of the design phase: the command PCB!

The idea here is to provide a simple way to select the amplifier to be used, so a rotary switch feels like the best solution. As I don't want to bother with a power switch, I also decided the 1st position will act as an OFF position.

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Electronic schematics.
#Guitar#Amplifier#DIY
Public
A-wai :debian:

Amp switcher: relays array design 🧵

Background story: fosstodon.org/@awai/1140938655
Project overview: fosstodon.org/@awai/1141105471

As I mentioned previously, I intend to design a single board for both the input and ouput switching sections.

I had initially planned to have only the jacks (and associated relays/circuitry) going to/from the amp on the board; then I wanted to add the speaker out jack, and maybe also a buffer, and make it optional, and... Well, you get the idea 😉

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3D rendering of a printed circuit board, showing 9 jack connectors, 8 relays and a number of other electronic components.
#Guitar#Amplifier#DIY
Public
A-wai :debian:

Amp switcher: high-level design 🧵

This project's goal is to be able to select a single amplifier out of 6 without having to mess with cables, and use them with a single input cable and speaker cabinet.

Let's start with the block diagram: the guitar input is routed to one of the amplifiers' input, and the speaker output from the same amplifier is routed to the cab.

Although this all looks fairly simple, there are a few points that require significant attention.

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#Guitar#Amplifier#DIY
Public
A-wai :debian:

It's that time again where my brain needs a new, different project 😉

But first, a bit of background story: I've been playing music, and mostly guitar, for over 3 decades now. Being quite a nerd, at some point I started looking into guitar-related electronics, and eventually fell down the "tube amplifiers" rabbit hole.

I grew passionate about tube amps and even built my own; most were sold over the years but I still have a few, and recently bought a couple new ones.

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Two stacks of guitar/bass amplifiers: * on the left, a small red 1x12" speaker cabinet with 3 amplifier heads on top * on the right, a grey vertical 2x12" cab with an additional head on top of it
#Guitar#Amplifier#DIY
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