Supa-Trem / Demeter Tremulator

Fulltone Supa-trem x Demeter Tremulator

More one case that one cloned another one...
Supa-trem ($219.00) and Demeter Tremulator ($200.00) have pratically the same circuit...
James Demeter developed his tremolo in the 80's based on a old fender twin tremolo, and later it was cloned by Fulltone and renamed as Supa-trem... Fulltone also made some mods surrounding the IC LF442... and others useless mods like put foot-switches for change the potentiometers... but who already saw square and sine waves in the same song?
anyway Demeter did a great job! its one of the best tremolos ever built...

Fulltone Supa-trem and Demeter Tremulator Boxes showing their internal circuits

....in the circuit the lfo and the amplification stages are in a quite different way... allowing a versatile 'Depth' control (called 'Mix' in the Supa-trem)
in the supa-trem the speed foot-switch is used to drive the rate pot which is a double pot 1M/500k, changing to a lower resistance we have an increase on the rate... and the Hard/Soft foot-switch is connected in parallel with a internal pot, that control the amount of bright of the lfo LED and this way controlling the wave's shape... being one fine control of depth... (in the Demeter also has this trimpot for fine depth... but not the other supa-trem's trimpot that control the level, which is replaced by a 10k resistor)...
They maybe can sound a little different just because of differences in the regulation of internal trimpots.

Here there is a video comparing Fulltone Supa-Trem and Demeter tremolator.

All components are easy to find, I had problems only with some resistors values like 7k5 and 8k8...
I used a LED/LDR isolated with heat shrink cable insted of an optoisolator like the VTL5C3...
My schematic was based on Baja Trembulator and on the original Supa-trem and the layout was based on Patrick Johnson's "Dull Bone Koopa-Gem"... i used a millenium 4049 together with the circuit and changed to use only one on/off LED who also blink with the ocillation...

My Supa-Trem / Demeter Tremulator pcb