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Tremolo Effect

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djstumerch

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Hi everyone, I have been working on a tremolo effect for a university project. it's an old R A Penfold design. I have breadboarded from the schematic but used a 2m2 Log pot instead of a 2m2 Lin as I could not get hold of one of these at my local electronic outlets.

Does RV2 control the rate or the depth?

When I tested it earlier I could hear a slight tremolo effect but nothing like I expected. Could this be caused by the log pot?

Cheers Stu
 

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  • Tremolo Schematic.png
    Tremolo Schematic.png
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Looks to me as if RV1 is depth and RV2 is rate (IC2a & IC2b are the oscillator).

It should work equally well with linear or log pots, so you must have made a mistake somewhere.
 
I always believed that the CD4007 part was obsolete. TI has a data sheet revised on 2003. (!)
 
Hi, I purchased the CD4007 from Farnells. I went through the breadboard again and had it checked over by a friend who seemed to think it was correct too. I played it again through some rokit krk6's as I thought it was possible the speakers I was originally testing the circuit on didn't cover the lower end audio bandwidth but still you could only hear a slight stutter. I have changed the chips and checked over breadboard enough times to know its correct. Any ideas?
 
Isolate the problem.
Check the AC voltage on pin 1 of IC2.
Than disconnect the 47k pot from pin 1 and connect it to +9V. Vary the pot and the FET should act like a volume control.
Replace the FET with the other 2 in the package or go to a discreete (2N5460?)
E
 
could it be because it is created on a breadboard. Breadboard's have a high capacitance so audio circuits are not very good when made on them. High frequency oscillations occur along with other noises such as picking up radio signals :D

also check all your component values are correct and your power supply has little noise on it

a log potentiometer is the same as a linear but it has a different movement direction so that isn't the cause of the problem
 
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