simple noise gate idea...advice sought!!

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simple noise gate idea...advice sought!!

Postby pinkjimiphoton » 18 Jul 2013, 04:25

hi guys, i find more and more i could use a decent or even a crummy noise gate to play with, as some of the filth boxes i've got would be able to raise the dead much
more effectively without the scirrocco of noise they produce when like, 6 or 8 of them are engaged.

so me and petey were looking around at easy gates, and found one on techniguitare.. but petey said someone here said it didn't work.
well, if they built the vero in the pdf on that site, it sure won't... they have all kinds of mistakes in it. CLOSE, but no cigar as groucho used to say.

so i took a look and saw the problem... they had reversed a couple component values from the schematic, and had pin 5 of the opamp grounded...when it should have had a 100n cap and 2.2m resistor there. i think that jumper to ground is why it wouldn't work as shown.

for reference, here's the forum page with files for the project:

http://techniguitare.com/forum/fiches-t ... t9557.html

here's the original schematic:

Image

i looked at it, and it looked easy, and doable on vero cuz it was simple.

so i aimed to overcomplicate it some.

also, they specced tl071, and i don't have any... i have 741's, but... i also have ne5534's, which are low noise jfet single opamps. an ass load of 'em.

so i figured i'd adapt it.

now, i've used a similar kind of 741with frequency compensation... and it sounded good, but without the frequency comp circuitry it's noisy as f***.

so i looked at the data sheet, looked fairly simple... a cap between pin 8 and 5 (don't know what value is good, i wrote .47 on the schem but on the vero it shows sockets to experiment with)
and a pot between pins 1 and 8, with a 22k resistor being fed by the b+ voltage.

i THINK it should enable finding the frequency for where it cuts off... not sure. need advice on this part, cap values and such please if possible.

if it's not worth f'n with, please illuminate me so i can ditch the stuff... or if i made some other dumb mistakes.. ;)

likely, with me. :icon_eek:

here's the data sheet or the 5534:

http://www.onsemi.com/pub_link/Collateral/NE5534-D.PDF

also added an ass load of power supply filtering/protection... current limiting resistor, snubber, diode in line and diode reverse biased to ground and a big honkin' 220u cap, hoping that by doing so it will make this thing as quiet as possible in operation.

added in a simple circuit to flash an led white the gate is operating. didn't bother with t/b switching stuff.

here's the schematic first:

Image

and here's the vero i worked up... a second set of eyes is always welcome in these matters of course... if someone can give me a thumbs up or down, i plan on building this puppy posthaste.

Image

so... i would really appreciate advice, criticisms, GFY's, attaboys, whatever ya go!

thanks brothers...peace
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Re: simple noise gate idea...advice sought!!

Postby rocklander » 18 Jul 2013, 04:50

I know zero about the technical stuff but am looking forward to see if this works cos only within the last week or so I was asked to do a noise gate.. was gonna do the mxr, but if this works might do that instead.. be an easy one for me to 1590a-ize
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Re: simple noise gate idea...advice sought!!

Postby pinkjimiphoton » 18 Jul 2013, 05:58

i'm gonna give it a go for shitz and grinz, but paul at the other place says it will be fucked up... but he gave me an idea for an easy gate that may work out... i'll keep ya posted bro
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Re: simple noise gate idea...advice sought!!

Postby mictester » 18 Jul 2013, 22:42

The simplest gate I've found that works well uses a dual op-amp (5532, 4558), a 4066 CMOS switch and a couple of buffer transistors..

The first op-amp gives gain from the incoming audio, there's then a "diode pump" rectifier, which gives a DC voltage proportional to the incoming level. The second op-amp is configured as a comparator, with one input connected to the wiper of a pot (or preset) to set the threshold, and the other taking the audio-derived DC. The output of the second op-amp goes up to almost the battery rail voltage when the incoming audio is loud enough. The output of the second op-amp drives the control port on the 4066, "making" the internal connection in the IC. The audio is therefore switched on and off at a fixed level, suppressing low-level noise. If you want a circuit sketch, I'll put one up later.
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Re: simple noise gate idea...advice sought!!

Postby rocklander » 18 Jul 2013, 22:48

mictester wrote: If you want a circuit sketch, I'll put one up later.

please do :-)
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Re: simple noise gate idea...advice sought!!

Postby J0K3RX » 18 Jul 2013, 23:54

Here's a nice looking one... If you can translate the Russian there is a Sprint layout on there also..

looks like you can sub the KT3102 for a BC547 and the KP303 for a J201.

Sounds good from the youtube vid..

http://www.guitar-gear.ru/index.php?p=proj&id=120
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Re: simple noise gate idea...advice sought!!

Postby pinkjimiphoton » 19 Jul 2013, 00:31

@ joker... thanks bud...

@chris.. PLEASE DO!!
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Re: simple noise gate idea...advice sought!!

Postby thfred » 01 Sep 2013, 19:46

Ho Jimmy,

I have your 5534 noise gate on the breadboard and it is working. Not sure if it is ok for what I want to do but its serving its purpose.
Just wanted to let you know that there is an error in your handdrawn schematic. the Drain of the FET should NOT be connected to +9V. Its only connected to the Input signal.

Thomas

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Re: simple noise gate idea...advice sought!!

Postby adielricci » 01 Sep 2013, 22:01

Really nice idea!

Have you considered an input buffer?
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Re: simple noise gate idea...advice sought!!

Postby pinkjimiphoton » 01 Sep 2013, 22:25

thanks for the report thomas, i will amend the schematic and give it a try..

i DID finally break down and just buy an ns2. love it.
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Re: simple noise gate idea...advice sought!!

Postby pinkjimiphoton » 01 Sep 2013, 22:30

heres the schematic, fixed

Image
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Re: simple noise gate idea...advice sought!!

Postby adielricci » 03 Sep 2017, 22:19

After several failures trying to clone the MXR Noise Gate, I decided to move on. I found the Shutup! Noise Gate, assembled it, but it produces a ticking noise when the gate opens, and a nasty delay to close. After some modifications, I managed to overcome those problems, and added an LED gate status indicator and an optional swell effect, a Slow Gear simplified wannabe. This is the prototype of the AQR Noise Gate.

Image

Image

Image

Image
Last edited by adielricci on 03 Sep 2017, 23:24, edited 1 time in total.

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Re: simple noise gate idea...advice sought!!

Postby pinkjimiphoton » 03 Sep 2017, 23:19

nice bro!! gotta vero worked up too by chance?
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Re: simple noise gate idea...advice sought!!

Postby adielricci » 03 Sep 2017, 23:25

pinkjimiphoton wrote:nice bro!! gotta vero worked up too by chance?


Sorry, I did it "by ear"...

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