Channel switcher PCB
Moderators: pompeiisneaks, Colossal
Channel switcher PCB
I thought maybe someone might find this useful. Here are gerber files for a multi channel switcher PCB: http://ghr.fi/tube/switcher/multichanne ... gerber.zip. It's a 2 layer PCB sized 74mm X 42mm.
http://ghr.fi/tube/switcher/multichanne ... gerber.zip
http://ghr.fi/tube/switcher/multichanne ... gerber.zip
- dorrisant
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Re: Channel switcher PCB
Nice work... but I don't know how excited I should be. Do you have a link for the circuit description from Merlin?
"Education is what you're left with after you have forgotten what you have learned" - Enzo
- chief mushroom cloud
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Re: Channel switcher PCB
I just incorporated this very circuit into a piece of amp production equipment (to toggle amps on burn-in rack to monitor speaker outputs at o-scope)
Don't overthink it. Just drink it.
Re: Channel switcher PCB
The gist of it is when a button is pressed a relay driver transistor turns on. Only one transistor will be on at a time.
You can find a description of how this kind of a circuit works here http://sound.whsites.net/project163.htm. Just scroll down to where it says Discrete CMOS Logic.
You can find a description of how this kind of a circuit works here http://sound.whsites.net/project163.htm. Just scroll down to where it says Discrete CMOS Logic.
Re: Channel switcher PCB
What is V+ for this circuit?
Re: Channel switcher PCB
Interesting project. Can individual switches be turned off, like pedal? So you have radio button option between 4 switches and option to bypass all?
Poslano sa mog Redmi Note 6 Pro koristeći Tapatalk
Poslano sa mog Redmi Note 6 Pro koristeći Tapatalk
Re: Channel switcher PCB
Great project!
I’ve had some of these made and in the next few weeks will incorporate into a 4 channel amp, so will report back.
Quick question: can 2 of these chips be used simultaneously for 8 channels? Wondering how the flip/flop reset would work in this instance
Cheers
I’ve had some of these made and in the next few weeks will incorporate into a 4 channel amp, so will report back.
Quick question: can 2 of these chips be used simultaneously for 8 channels? Wondering how the flip/flop reset would work in this instance
Cheers
- chief mushroom cloud
- Posts: 420
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Re: Channel switcher PCB
Yes. We used this circuit for a set of amp monitoring and burn-in units in mfg....with two of these circuits per unit (8ch) and linked for a total of 24 ch...just connnect the CLK pins together.
Haven't tested more than that. Might need bi-directional buffer between CLK circuit sets if cable L get too long. We just use std midi cables to link clk and audio. Also used CD40xx buffers to drive relays...but I would use 2N7000 or similar to lo-side switch relays and LEDs for anything under 8ch. Also, DON'T share your relay logic gnd w/ your audio gnd.....reference terminate it at chassis common.
Don't overthink it. Just drink it.
- dorrisant
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Re: Channel switcher PCB
Very nice... I am a bit excited now, gotta try it out. Thank you very much for posting!
"Education is what you're left with after you have forgotten what you have learned" - Enzo
Re: Channel switcher PCB
[quote="chief mushroom cloud" post_id=397727 time=1556724621 user_id=54]
[quote=kdmay post_id=397613 time=1556499639 user_id=9465]
Quick question: can 2 of these chips be used simultaneously for 8 channels? Wondering how the flip/flop reset would work in this instance
[/quote]
Yes. We used this circuit for a set of amp monitoring and burn-in units in mfg....with two of these circuits per unit (8ch) and linked for a total of 24 ch...just connnect the CLK pins together.
Haven't tested more than that. Might need bi-directional buffer between CLK circuit sets if cable L get too long. We just use std midi cables to link clk and audio. Also used CD40xx buffers to drive relays...but I would use 2N7000 or similar to lo-side switch relays and LEDs for anything under 8ch. Also, DON'T share your relay logic gnd w/ your audio gnd.....reference terminate it at chassis common.
[/quote]
Thanks mate
I am actually planning on building an 8 channel amp and 4 channel cab switcher, so this is helpful!
In the amp build I mentioned I am trialling this, I am definitely not going to share the logic ground with the audio ground. A buddy did this with one of the Tube Town Midi boards and had all sorts of troubles so had already warned me on this.
[quote=kdmay post_id=397613 time=1556499639 user_id=9465]
Quick question: can 2 of these chips be used simultaneously for 8 channels? Wondering how the flip/flop reset would work in this instance
[/quote]
Yes. We used this circuit for a set of amp monitoring and burn-in units in mfg....with two of these circuits per unit (8ch) and linked for a total of 24 ch...just connnect the CLK pins together.
Haven't tested more than that. Might need bi-directional buffer between CLK circuit sets if cable L get too long. We just use std midi cables to link clk and audio. Also used CD40xx buffers to drive relays...but I would use 2N7000 or similar to lo-side switch relays and LEDs for anything under 8ch. Also, DON'T share your relay logic gnd w/ your audio gnd.....reference terminate it at chassis common.
[/quote]
Thanks mate
I am actually planning on building an 8 channel amp and 4 channel cab switcher, so this is helpful!
In the amp build I mentioned I am trialling this, I am definitely not going to share the logic ground with the audio ground. A buddy did this with one of the Tube Town Midi boards and had all sorts of troubles so had already warned me on this.
- dorrisant
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Re: Channel switcher PCB
Yes. No reason to ground it to the chassis.
"Education is what you're left with after you have forgotten what you have learned" - Enzo
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Re: Channel switcher PCB
I’ve bread boarded this circuit and works well. However on power on, all switches are on.
Is this normal behaviour? Kinda not useful if it is!
I’m sure I’ve done a thing wrong
Is this normal behaviour? Kinda not useful if it is!
I’m sure I’ve done a thing wrong