Simple Tremolo Circuit

[MRTelec]

Hi,

What's the simplest tremolo circuit out there?  I need something easy as cake for a project I'm working on.

Thanks, I appreciate it.

[brett]

The Electronics Australia tremolo (aka EA tremolo) is fairly simple and very effective.

[MRTelec]

Thanks, but does it get even simpler than that?  

[petemoore]

Theres'a  pulsar and a Kay, both low parts count like the EA.
 I still need to build a couple more EA's ... one's bound to work sooner or later...everybody's elses is...lol

[nightingale]

hello~
i think the KAy is the lowest parts count... but it's been throwing me for a loop... i think it is really sensitive to the tranny's... i have etched/populated two boards to get very questionable results...
i am looking at the EA Trem next... i need a trem asap!
hope this helps you decide,
~ryanS

[Oliver]

HI,

look at this simple Circuit.... (i didn't try it yet, but looks cool)

http://forum.musikding.de/attachements/fet-trem.gif

bye
Oliver

[Ge_Whiz]

This last suggestion is no simpler than the EA design, since it needs a separate oscillator to drive the JFET. No, I reckon the EA design is the simplest. I have seen simpler, but they all 'pump' the speaker - not good.

[Paul Perry (Frostwave)]

The 'lowest parts count' trem might be a flashing led, coupled to a LDR forming half of a voltage divider, so that the input signal is modulated.
Downside: fixed lfo rate (vary depth with pot in series with the LDR).
It is probably the extreme variation between one fet & another that causes some peopel to have problems with the EA (or similar fet based designs).

[ExpAnonColin]

I'm almost done building an incredibly simple panner...  2 2n3904 square wave oscillators out of phase driving 2 LEDs, which then hit LDRs for each channel.  I'll probably end up amplifying it at the end, because I can imagine a bit of signal loss.

-Colin

[C Bradley]

I've got a tremolo I designed and built that uses a 555 timer and a 741 chip. It's real easy to build, but has a mild tick in the background.

I'll have to draw up a schematic of it. It's just a 555 used as a squarewave oscillator that drives an LED/LDR setup. The LDR grounds the output of the 741 amplifier. The 741 amplifier is a non-inverting amp with a gain of about 5.

Simple.

Chris B