Soft Switch True ByPass with NAND Gates

[@hailfastcore]

Incredible! Really well done video.

[@Epic501]

Such an awesome video series, but for future videos, with the VO editing you should use an expander rather than a gate, the quite loud fan noise in the background being chopped hard off is distracting. It counter-intuitively sounds much less noisy to actually keep some of the noise there at all times.

[@erikvincent5846]

Can you let me know an exact time on the video it does this? I want to see if I can isolate it out better for the next videos.

[@delatronics3257]

The use of a latching Logic or transistor circuit is probably more reliable and definately cheaper IMHO

[@modeno74]

That would be nice to add to a pedal build, great explanation. Will the relay and IC be available on the webstore at some point?

[@chunkymonkey059]

Is there any switch popping with this circuit? I've tried similar switch circuits with dpdt relays and would get a pop when hitting the foot switch. I've tried a couple different things to reduce it but haven't had any luck.

[@erikvincent5846]

I haven't had much problems with popping on this circuit. So long as the effect PCB has the proper bleeder resistors and doesn't have leaky input/output capacitors, it should be fine. Note that the resistor for the LED is 4.7K or greater, as that also helps reduce the likelihood of popping.

[@chunkymonkey059]

@@erikvincent5846 Good to know, thanks! I'm actually using it as a loop switcher so instead of going to a PCB I'm going to a send and return for another pedal. I appreciate all the videos. I've learned a lot.

[@chipsterb4946]

@@chunkymonkey059 please post your results if you build the looper. That was my first thought when I started watching this video. I don’t need a “smart” looper but do want silent, relay and true bypass switching. Loop 1 for fuzz & wah, #2 for overdrives, #3 for dirt boxes, and #4 for modulation/time effects. Everything I’ve found on the market is more complicated and bloody expensive.

[@chunkymonkey059]

@@chipsterb4946 👍

[@nathanguy981]

This video has been super helpful. If I replicated the circuit with the other half of the NAND gate and another relay, I should be able to control a dual overdrive circuit, yes?

[@fen3184]

Great video, thank you! Two noob questions, if you don't mind... 1. If the switch is likely to degrade over time, and have a more erratic micro-bounce, would it be wiser to replace the 0.33uF capacitor from the start, rather than wait? 2. If swapping out the 0.33, how high is too high, such that tapping the switch too quickly/lightly wouldn't be long/hard enough for the circuit to kick in?

[@erikvincent5846]

Valid point, you could go higher, but you don't want to go too high.

[@lordrahulcool]

@@erikvincent5846 will 330nf mylar ceramic cap be okay or it needs box cap?

[@erikvincent5846]

@@lordrahulcool mylar will work too.

[@thenonebadh]

NIce vid. Quick question: youre using the Nand-gates as inverters right? If so would it be possible to realise the circuit wit NOR-gates? I have a few CD4070BE-chips flying around...Keep up with your work.

[@erikvincent5846]

I believe you might be correct about the NOR gates. I just had a bunch of NANDs sitting around from an old 8-Bit computer project I was working on.

[@pedro_rivera99]

Can I use the remaining gates as another bypass switch? For example, in an overdrive/boost, I use two of the gates for the overdrive side and the other two I used it for the side Very good video, I've always used a 555 timer as a latch for this type of switching

[@erikvincent5846]

You could use the other two, yes. I've done the 555 timer before as well. They are both good circuits and easy to use.

[@tnopsaudio]

theres no relay pop?

[@elijahbanaspati7375]

Dude can you help me please. I have a Seymour Duncan Tweak fuzz and I think it got some troubles. When the pedal set off and the tweak knob is in "1" all the signals totally goes bypass and clean, but when I tweak it to 2 - 6, it really affects the signal and the tone even when I've turn the pedal off. Can you help me explain what's really happening here? Thankyou very much before.

[@erikvincent5846]

Well, assuming the schematic on this page is good, which is a bold assumption, forum.seymourduncan.com/forum/the-pedal-board/306294-tweak-fuzz-double-tweak-mod#post5112438 then that would indicate you have something bad with that switch or a loose wire going to that switch. The tweak knob is just a rotary selector going between different RC input filters of increasing/decreasing values, which then, in turn, goes into a silicon fuzz face style topology. Because of those RC filters, it appears to have several 100K resistors as the "R" in the "RC", so I wonder if any of them, in particular is accidentally shorting out other pins and causing the two transistors to oscillate or do other weird things. Technically, that stomp switch would be isolated from that, in by-pass mode, but that too might be a problem, being that maybe the stomp switch is bad.

[@elijahbanaspati7375]

@@erikvincent5846 wow thankyou very much dude🙏🙏🙏.

[@tomfoolery2082]

Is it a complex mod to make a pedal tru bypass . Thx

[@erikvincent5846]

Depends on the enclosure the circuit is in.

[@error8418]

It's possible to cram something like this into a boss pedal