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Studio Electronics Boomstar Manual 1 Design Behind the ‘Stars

THE DESIGN BEHIND THE ‘STARS

As SEfansknow,we’vebeendoingthemultiplelterthingforsometime,andwhileourapproachhasneverbeen

one of exact emulation of the original synthesizers—that could only be accomplished if the entire signal path were

cloned as well—the focus and purpose was, and remains, to bring the main essence—the “spirit” of the classic

originals into our own unique, performance-based platforms, and in the case of the Boomstar accomplish that

withasmanyhardwarefeatures,i.e.,crossmod,ringmod,overdrive,feedback,thatwouldt!Judgingfromthe

manyatteringremarks(fromowners,well-wishers,followers),anddownrighteusivepraise,satisfactionhasbeen

achieved—andthankstoall!

Critical Circuit Details: For oscillators we’ve essentially been using the same Moog-based design since our reissue

of the MiniMoog® stabilized oscillator board. In the Boomstar synths we replaced the Fairchild cans with 3046s,

which are stabilized with temperature compensating resistors placed on top—something very similar to what is in

an S.E.M: it gives us just the right amount of warmth and tuning stability. The Moog®lteremployedinallourown

synths is a clone, except that in the Boomstar 5089, a 3046 replaces the original hand-matched transistors in the

top and bottom of the ladder. The resonance produced is lovely; it sits perfectly along with the signal, singing out,

but never dominates. The 4075, 3003, and S.E.M. are faithful to the original circuit designs, with some license taken

by Tim Caswell in case of the SE80lter,dueto1970scustomlterICsemployedinYamaha’sdesign.TheVCAinthe

BoomStar is the MiniM—g® VCA, which we used in the SE-1(X) as well, while the Omega and ATC series synths use

a VCA incorporating an LM13700, in case you were wondering.

Theseare“through-hole”(tobecontrastedwith“surface-mount”)anddecidedlydiscreteanalogsynthesizers:the

Holy Grail of PCB assembly procedures, built to last and remain completely serviceable—bound to be necessary if

theystickaroundmakingpeoplehappyaslongasweexpectthemto!

Greg St. Regis 5.3.14

El Segundo, CA USA

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