1 Knob Noise Gate

[Skajaquada]

Hi guys.  I tried the last layout in the thread, but wasn't getting any effect at all.  I looked at the second layout, and moved the ground leg of C3 up one row.  Now it's working TOO well...  Not only is it cutting out the noise, but it's also cutting most of the gain out.  I'm using bc549s with a bs170, and a b25k pot.  Any ideas?

[Skajaquada]

*sigh* disregard this guys...  Apparently I'm an idiot, and I wasn't seeing an error I made on the board, even though I checked it about 20 times lol.

I got it working, the 3rd layout is great.  Thanks boratto!

[Willybomb]

Registered just to post this:

Great layout and effect, works fantastically.  Used a 250kB pot for the purpose of testing.  Otherwise, bs170 and bc549s were used.

Thanks,
Willy.

[ξεναγος νεκροπολης]

i'm leaving this here just in case someone needs this..i made a second layout cause i wanted it with trimpot and as small as possible so i can use it as a daughter board inside the animato that really has a problem...



Savvas

[Addy Bart]

Thanks for sharing this layout. I'm sure it will come in handy at some point.

[mug]

Hey Savvas,
nice idea to use it that way - my plan it to stick it in a 1590a, prob. with a 9mm pot.
Anyway - is there a specific reason why you left out the 100 µF from 9V to GND (C1)?

[ξεναγος νεκροπολης]

hi there! sorry for the late answer.
i drew this so you can put this in the same box with an other effect.i left out the 100uf cause i powered this daughter board from the main board that already had that cap. so for your project it would be a good idea to put this cap back in somewhere...
cheers
Savvas

[mug]

That's what I was guessing - thanks!
I've build it in the mean time and it works really nice - threw in a B50K pot and its easy to dial in the right threshold.
Won't box it though since I found out how to avoid the noise issue I had without a gate (JamMan looper has its own PSU now) - but it might come in handy once!

[motterpaul]

I am now stumped. I built two or three of these that worked perfectly a year ago, but now I just tried to build two more in a row and both just suck tone.

The first ones sounded the same whether the box was on (and gate open) or off, but these newer ones have a huge volume drop when the gate is on but open.

Any suggestions? Is the ohmage of the pot super important? It says 1M, but to try 25k or 50k - that's a pretty big difference. I have tried 1m, 500k, 250k, and 50k and it doesn't really seem to make any difference.

I noticed originally the suggested BC170 trannys (i think) instead of 2n7000 - I used the latter. Does it matter?

[Sphere80]

Flip them

[motterpaul]

Flip the transistors - different pinout?

[motterpaul]

Never mind,  I see it now. I will give it a try

[rocket88]

If you're having issues with a build post about it in the debugging section.

[doxasound]

I just built two of these and I had to flip my transistors around for it to work... weird... I used a 2n7000 and BC549 transistors. After flipping the pinout this noisegate worked so well! Thanks so much! I put this inside an AT distortion clone and it silenced the thing without attenuating my volume too much! Thank you!

[doxasound]

Just realized the 10uf input cap is backwards!

Not sure how I got this working the first time I built it, unless I caught that cap, but never said anything haha

[reggy1]

I'm also a bit confused by the poloarity of c4 (10uF).

The layouts of boratto and chris60601 show the input going to -'ve of c4 and gate 1.

The schematic of chris60601 and Savas's layout shows the input going to +'ve of c4 and gate 1.

I also noticed that Storyboardist, on his excellent blog, has the input going to -'ve of the cap and gate 1 on both his schematic and layout.

Doxasound mentions that the 10uF cap is in backwards, but in which version? Boratto's and chris60601's layout, or chris60601's schematic and savas's layout?

Reg

[Shaggy45]

i built this today from the third layout. i tried the 10uf in both orientations and it didn't seem to make a difference. i tried both bc107 and 2n7000. i had to swap the orientations of all the transistors for it to work. hope this helps

[Addy Bart]

Has anyone tested the circuit using headphones? Got this on the breadboard, and there’s a noticeable clicking sound whenever the gate reopens.

[motterpaul]

I never noticed a pop or clicking when using it live.

On 2/26/2018 4:04 PM, Addy Bart [via Guitar FX Layouts] wrote:

Has anyone tested the circuit using headphones? Got this on the breadboard, and there’s a noticeable clicking sound whenever the gate reopens.

---

If you reply to this email, your message will be added to the discussion below:

http://guitar-fx-layouts.42897.x6.nabble.com/1-Knob-Noise-Gate-tp16440p41919.html

To unsubscribe from 1 Knob Noise Gate, click here.
NAML

[Addy Bart]

Thanks motterpaul - I’ll try it through my amp next time.

I tried messing around with the cap values in the hope I could soften the switching but no joy. Guess a gate with an attack pot is what I need.