From gacki@sax.sax.de Fri Oct 14 09:04:33 1994 Date: Fri, 14 Oct 1994 09:36:40 +0100 From: Malte Rogacki To: analogue@magnus.acs.ohio-state.edu Subject: Re: Oberheim SEMs ? So it's time again for me to post the connections for SEMs? Here we go: (Excerpt from original SEM Owners Manual) INPUT-OUTPUT-CONNECTIONS All input and output signal connections to the Expander module occur on several color-coded Molex connectors on the electronics board. The following table summarizes these connections. The connectors can be identified by noting the single alphabetic letter, etched onto the board, adjacent to each connector. Pin 1 of each connector is the pin at the beveled end of the connector. CONN. PIN FUNCTION CONN. COLOR A1 External Modulation Input - VCO 1 A2 Sawtooth Output - VCO 1 Orange A3 Pulse Output - VCO 1 B1 Control Voltage Input #1 - VCO 1 B2 Ground Red B3 Control Voltage Input #2 - VCO 1 C1 Sync Output - VCO 1 C2 Ground Yellow C3 Sync Input - VCO 1 D1 Control Voltage Input #1 - VCO 2 D2 Ground Red D3 Control Voltage Input #2 - VCO 2 E1 External Modulation Input - VCO 2 E2 Sawtooth Output - VCO 2 Orange E3 Pulse Output - VCO 2 F1 Sync Output - VCO 2 F2 Ground Yellow F3 Sync Input - VCO 21 G1 LFO Trigger Input G2 Ground Brown G3 LFO Output H1 Control Voltage Input #1 - VCF H2 Control Voltage Input #2 - VCF Grey H3 External Modulation Input - VCF I1 VCA Output I2 Ground White I3 Output Amplifier Input J1 Hi Pass Output - VCF J2 Ground White J3 Bandpass Output - VCF K1 Selected VCF Response Output K2 Ground White K3 Low Pass Output - VCF L1 External Audio Input #1 L2 Ground Blue L3 External Audio Input #1 M1 External Audio Input #2 M2 Ground Blue M3 External Audio Input #2 X1 Output - ENV 1 X2 Gate Input - ENV 1 Green X3 Trigger Input - ENV 1 Y1 Output - ENV 2 Y2 Gate Input - ENV 2 Green Y3 Trigger Input - ENV 2 Z1 +18.5 Regulated Voltage Input Z2 Ground Z3 Ground Black Z4 -18.5 Regulated Voltage Input --------------------------------------------------------------------- Hmmm, this should basically do the job. However, on the diagram is the numbering for connector C (only connector C!) exactly the other way around, so Pin 3 is on the beveled end with this one. You may want to check the reality for yourself (shouldn't cause any damage when wired wrong). In the owner manual are also descriptions how to set certain jumpers when you want to have the envelopes triggered individually. SEMs are preconfigured so that both envelopes are started by the same gate- or trigger-impuls. Another question: Does anybody know of a source for those 3-pin-connectors? Anybody going to order a few? Maybe a few hundreds? Malte Rogacki gacki@sax.sax.de 100116.154@compuserve.com ----------------------------------------------------------------------------- "Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you get no sound out of it." (ARP 2600 Owner's Manual) -----------------------------------------------------------------------------