EA tremolo hiss/noise on the puls

[wyn]

 Just made a EA tremolo efter beavis audios schematic and it works fine, apart from an annoying hiss on the puls.

Is it because its on the breadboard?

something wrong? help guys.

heres the audio if you want to hear it.

https://plus.google.com/u/0/102729661034733473192/posts/CH6Zx462kDA?pid=6239738840109185906&oid=102729661034733473192

[antonis]

If you have a Rate indicator LED, try to replace it with a 4k7 resistor and see if it stops..

(or temporary short it's legs..)

[wyn]

nope, still there....

[Transmogrifox]

Is this what you're looking at?


Short Q2 drain to source and see if you get steady hiss.  Then you know it's not coming from the oscillator section nor from the control FET.

This very well may be a result of breadboard wiring.  Are you using a battery or some kind of a wall wart to power it?  Could be noise from the power supply it it's not a battery.

Are you going directly into this with a guitar or are there other stompboxes/buffers in front.  Maybe it's just amplifying noise that's already at the input and maybe nothing wrong with the EA   It has a fair amount of gain when wide open.

[garcho]

^ beware the dual Q2; one is BJT one is FET

when there is a blanket of hiss, if it's low enough, you stop noticing immediately. shake that blanket out with a trem and all of a sudden you notice it every period

EDIT:
wow, i should have listened to the audio, never mind. it sounds a little like something that should be grounded isn't.

[deadastronaut]

its a good crickets effect

[wyn]

i think it maybe amp noise and because its open on the breadboard. ive just made the EA version from homewrecker. theres still a little bit of hiss but not as much as the first version.

it sounds better as well.

transmogrifox - guitar directly into an open jack and into the breadboard plus a 9V battery.

Garcho - ille doublecheck the grounding next time i breadboad it.

thanks again for the input guys!

[wyn]

its a good crickets effect

True, i usually ignore it when i make a fuzz or something dirty, it usually goes away when i move the pickup to a humbucker. Hopefully its gone when i make it and put it in an enclosure.

[duck_arse]

while you're there, remove C2 and link across.

where did that particular "mod" originate, I wonder.

[wyn]

while you're there, remove C2 and link across.

where did that particular "mod" originate, I wonder.

I dont know, but it sounds as if you do.

ille do that as well.... remove C2

[garcho]

^ capacitors in series are like resistors in parallel, so, unless you needed a 215nF capacitor instead of a 220nF, you can forget about the 10µF cap (or the 220nF cap)