Thread for random DIY-related questions

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crochambeau
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Re: Thread for random DIY-related questions

Post by crochambeau »

In that diagram the signal enters and exits the 4053, which is a CMOS circuit (not a physical connected switch) so that is not true bypass.

In my mind, anything that requires the power supply to be connected in order to complete a bypass signal path is not "true bypass".

That said, I use 4053 the switch signals and have no complaints. I would not sweat "true" anything - unless it's a client directive, these objects we make are ELECTRONICS.

I find each pass through a 4053 is roughly 100 ohms (it's a non-conventional rule of thumb I use, I've measured lower for sure) series resistance on the signal path, so the switches can get lossy if you're not planting any gain in the mix.
When in doubt, add resistance.

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Re: Thread for random DIY-related questions

Post by crochambeau »

If you're goal is an A/B comparison fixture, I would say a relay would be a better switch source.
When in doubt, add resistance.

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Re: Thread for random DIY-related questions

Post by FAP »

Yeah I figured as such :shrug: I’m reluctant to try relay bypass just because I would have no idea which kind(s) to get; in theory it makes perfect sense but I’m typically wary of electro-mechanical solutions due to wear & tear… granted a toggle switch is also electro-mechanical: guess I can’t really win on that front :P
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Re: Thread for random DIY-related questions

Post by crochambeau »

Relays should experience minimal wear and tear - unless you're switching something with DC on it - but yeah, it's basically just a switch. The real benefit is being able to throw multiples with a single command, or automate stuff (though relays switch slowly compared to CMOS) - CMOS can switch at audio rates.
When in doubt, add resistance.

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Re: Thread for random DIY-related questions

Post by FAP »

Trying to make an “interface” for my Zoom recorder. Basically, I need something that will attenuate the signal going into each individual input on the Zoom (in 4CH mode, this means IN1, IN2, and the EXT. MIC input serving as an additional stereo input). I could reduce the input gain on the zoom, of course: I’m just not sure I trust it. Will this circuit work, or would it lead to signal bleed (even if each channel is separated/not mixed together)?
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Re: Thread for random DIY-related questions

Post by crochambeau »

FAP wrote: Tue Jun 17, 2025 7:51 am Trying to make an “interface” for my Zoom recorder. Basically, I need something that will attenuate the signal going into each individual input on the Zoom (in 4CH mode, this means IN1, IN2, and the EXT. MIC input serving as an additional stereo input). I could reduce the input gain on the zoom, of course: I’m just not sure I trust it. Will this circuit work, or would it lead to signal bleed (even if each channel is separated/not mixed together)?

Image
That should work fine, the only thing that could cause bleed is if common/ground is resistive or floating - so if you do wind up with crosstalk that's where I'd look first.
When in doubt, add resistance.

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