How to change multiple parts in circuit using one toggle switch?

[walnutzh]

I am going to keep going, because I think it is interesting.

We have 9 modes and 24 SPST switches. I assume you would need 2 of the switches to go between the 4558s. That would let you connect 22 components wherever you want them with the rest of the switches. That should be more than enough to get 9 slightly different modes.

In the end, I am betting the analog switches end up being cheaper than some other options:

http://beavisaudio.com/projects/screamerlab/

Fantastic analysis! I'm not building anything involving those kind of complexity, just pure curiosity. Do you have a pic of the six quad spst? I can't recognize those switch on bonsai's circuit board. Thanks!

[Ripthorn]

For my plexi/JCM800, I was switching individual components using only two dual triode tubes.

I have also designed a delay that uses two quad SPST switch IC's controlled via microcontroller, and it works well, though you have to go through the effort of integrating the microcontroller. The CD4066 is quite handy for this task. For something like a tube screamer, a lot of variations can be achieved with relatively few parts substitutions (diodes in FB path, a resistor or cap here or there). The rotary switch can feed the microcontroller to control the switch IC's. It's not that bad and can make for awesome flexibility. Relays are great if you need to manage large voltages or have greater isolation than switch IC's provide (for example, in really high gain circuits).

[Vivek]

For my plexi/JCM800, I was switching individual components using only two dual triode tubes.

I have also designed a delay that uses two quad SPST switch IC's controlled via microcontroller, and it works well, though you have to go through the effort of integrating the microcontroller.

I used an Arduino to read foot switches and present control signals to Analog switches.

Code is available for those who are interested.

[ElectricDruid]

We have 9 modes and 24 SPST switches. I assume you would need 2 of the switches to go between the 4558s. That would let you connect 22 components wherever you want them with the rest of the switches. That should be more than enough to get 9 slightly different modes.

No only that, but if the switches are controlled by a microprocessor, you have complete freedom about which switches are on or off in each mode without any hardware mucking about. And you can change your mind until you get 9 modes you're happy with, just by reprogramming.

So say you've got various switches that let you select different combinations of low-end roll-off, gain, and post-distortion filtering...you could spend a lot of time experimenting with different switch combinations to find nine nice modes. Don't forget capacitors could be done in parallel and resistor values in series, so 2 switches would give you 4 combinations (both off, one on, other on, both on). Like that, 24 switches sounds like thousands of possible options, although not all are going to be useful or sound different from other combinations.

[r080]

Fantastic analysis! I'm not building anything involving those kind of complexity, just pure curiosity. Do you have a pic of the six quad spst? I can't recognize those switch on bonsai's circuit board. Thanks!

Lizardmn posted the link to the picture already, but here it is:

https://image.ibb.co/kmDKLq/ADAEB332-82-E1-4356-BDDC-E4145-FF92902.jpg

ADG1612
https://www.analog.com/media/en/technical-documentation/data-sheets/ADG1611_1612_1613.pdf

[PRR]

[ElectricDruid]

Lol! The brute force approach isn't your style, Paul, surely!

Anyway, 10A seems like overkill...isn't there one smaller?!

[PRR]

> Anyway, 10A seems like

What, you want to go to 11?

[walnutzh]

Fantastic analysis! I'm not building anything involving those kind of complexity, just pure curiosity. Do you have a pic of the six quad spst? I can't recognize those switch on bonsai's circuit board. Thanks!

Lizardmn posted the link to the picture already, but here it is:

https://image.ibb.co/kmDKLq/ADAEB332-82-E1-4356-BDDC-E4145-FF92902.jpg

ADG1612
https://www.analog.com/media/en/technical-documentation/data-sheets/ADG1611_1612_1613.pdf

nice! Thanks! it sure opens a lot of possibilities even for breadboard experiments.

[eh la bas ma]

There is a tool from guitarpcb available on musikding.de :

https://guitarpcb.com/wp-content/uploads/2018/06/The-AMAZING-ROTO-TONE-DELUXE-Final.pdf

This is designed to allow you to switch several components in a circuit. There is 4 mods possible, eight if you add a switch, as shown in instructions.

I had some difficulties understanding the routing, so I only used this kit to switch diodes configuration in a circuit.

According to the "Muff'n moduletta mod", this tool allows you to change only two components in the circuit, but I hope it might help.

[ElectricDruid]

> Anyway, 10A seems like

What, you want to go to 11?

Ouch! I suppose a 1590DD is always an option....?!?

[amptramp]

For a long time, turret tuners were used to select one of 12 channels on a TV.



Each of the channel strips contained coils tuned to a separate channel.  Later tuners were planar, sort of like a large rotary switch with a number of separate poles on one switch deck.

[eh la bas ma]

On this topic, I wonder if there is a way to switch two components at the same time in this configuration :

I built a Comet kit (DS-1 clone) and I wonder if it's possible to add the BM mode on a switch. There is a diode (D6) and a cap (cx1 near R6) at different locations, I wish I could put both parts on a single switch, maybe one with two positions and 6 terminals.

https://aionfx.com/project/comet-legacy/

"Big Muff mod: The DS-1 has a couple of building blocks in common with the Big Muff, notably the tone control
and the gain stage before the op amp. Some have experimented with adding a couple of parts to the DS-1's
gain stage to make it identical to a Big Muff clipping stage. To do this, put a 100n cap in CX1 and two 1N914s
for DX1 and DX2. This will clip the signal before it gets amplified by the op amp."

Is it doable with a  DPDT on-off ? How would it be wired ?

Edit : sorry... I made a mistake about D6, it's really Dx1 & Dx2. Close to Cx1, so it should be easier.




looks ok? sounds like it working...