EA Tremolo Question (ROG)

[Dizzy_G]

Hi all,

I have built a RunOffGroove version of the EA tremolo using the layout provided and I'm having a slight problem.
Problem is there is no tremolo signal.
The circuit will work in bypass mode and i get a clean signal but when i switch to tremolo i get no signal what so ever. The LED is flashing and i can change the rate at which it flashes no problem using the rate pot.
I have also adjusted the trim pot but to no avail, still no signal.

I used MKT caps for C2, C3, C5, C6, C7 & C8. Could these be causing a problem?

I will go ever the off board wiring again to see if i have made a mess of something but if someone has any ideas please let me know as it would be greatly appreciated.
Thanks
D_G

[arma61]

Hi

hard to tell the reason why isn't working (also by experts here) unless you can give more infos

have you seen this : http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

with those infos you'll get your Tremolo working in less that you can think     

Cheers
Armando

[Dizzy_G]

Okay thanks,

I can provide more info bar the transistor voltage values, i will measure those tonight and post them later on.

1.What does it do, not do, and sound like? No sound on "effect", bypass working fine
2.Name of the circuit = EA Tremolo
3.Source of the circuit (URL of schematic or project) = runoffgroove
4.Any modifications to the circuit? N
5.Any parts substitutions? No all as per the parts list, J201 used for Q2
6.Positive ground to negative ground conversion? N
7.Brand new battery.

LED is pulsing in relation to the rate knob, however no sound is coming thru.
Voltage values for Q1, Q2 & Q3 to follow

Thanks

[MarcoMike]

audio probe

[earthtonesaudio]

audio probe

+1.

You're in luck, because "No sound" is better than "wrong sound" in terms of how easy it will be to fix, most of the time.  It's very likely a missed connection somewhere, transistor installed incorrectly, or some other relatively easy fix.  There's also the less likely possibility the MOSFET is busted.

[squidsquad]

Make sure your blinking LED is installed properly...it is necessary for it to function.

[Dizzy_G]

Hi guys, thanks for the help,
Got it working, very simple problem in the end, there was a tiny piece of solder shorting under a cap  could not see it as i had to put one cap under the board, damn MKT's were too big to fit all together.

It sounds pretty good, but i might play with cap values as it is for bass, but for now it will do.

Thank ye all very much for the help, i'm sure i will be back again.

D_G

[tasos]

i double all capacitor values and made the same tremolo from tonepad!since i am a bass player too!