Demeter
DEMETER: Compulator Optical Compressor
Another compressor for the day – have not built this one yet, but I have tried the Baja LA2A that’s heavily based on this, and it sounds pretty good. Suggest testing the DIY vactrol off-board first to find something that works with the available parts. 5mm yellow LED worked well for me with the Baja version. … Read more
Demeter Fat Control
Looking for a mid-range frequency booster? This one’s apparently really good at it. Schematic and discussion on FSB here.
Demeter Fuzzulator
Here’s an interesting opamp-based fuzz from Demeter for Fuzz Friday. I imagine other dual opamps can be used in place of the LF442, so socket and experiment. The trimmer in the original seems to be set at 2.5k. Schematic can be found here.
Demeter Tremulator
Here’s a great sounding tremolo circuit from Demeter–the Tremulator. It’s an optical trem, using a VTL5C1. That part can be replaced with an LED and a LDR (600Ω on/50M off) combo. Also, the diodes used in the originals are 1N5229 4.3v zenners, though you can use other zenners up to 5.1v. Here’s the schematic for … Read more
Demeter Compulator
Here’s a really nice optical compressor from Demeter. It offers vintage studio compression that’s very transparent and a fairly simple simple build as well. The trimpot sets the gain of the compressor’s preamp stage. If the signal is distorted, turn down the trimmer till it’s clean. Here’s the schematic for reference.
Demeter Fuzzulator
This design was pretty awkward to get down to a reasonable size due to two opamps, a trimmer and mere ten diodes on board. I’m not liking the asymmetry, but i still fitted it in a quite compact size. In the demos, this one sounds like a nice and creamy opamp fuzz.. From Demeter site: … Read more