WIRING DIAGRAM-NEW TIMBRAL OSCILLATOR
The NTO is composed of two PC boards, one marked NTO/VCO and one marked NTO/CON. The two will be stacked and held together with insulated stand offs after all the wiring has been completed. Each NTO uses two sets of power supply lines for maximum stability. One set (red-white-black) is connected to the PC boards in the usual fashion. The other set travels along the panel mounted components. The two sets are joined together (red+red, white+white, Black+black) as near to the power supply as possible. If power supply plug and sockets are used, the joining is done on the male plug. If a barrier strip with lugs is used, the two lines are mated at the terminats of the strip. Further instructions concerning double sets of power supply lines are in the Manual (Appendix H, pages 10 and 11). The power supply lines along the panel will also interconnect all NTO's and PCO's on that panel, so no matter how many oscillators are on the panel, there will always be two sets of red, white, and black wires to connect to the power supply from the entire panel.
Power supply wiring on the panel should be done first. The wires should be routed neatly around the pots and hugging the panel. Make certain that the stranded wires connected to potentiometer terminals are very neat, and no loose ends, pig tails, or bare wires are allowed to touch anywhere.
Panel mounted resistors should he installed next. Teflon tubing should be used on all leads that come near other resistor leads, near to the panel, or close to other terminals or bare wires.
The NTO/CON board is positioned in the panel rack with the other PC boards for that panel as usual. Wire this board up to the designated pads (the NTO/CON pads have a small "c" in the wiring diagram). All of the other boards in the rack should be wired up at this time.
The power supply lines to the boards should be wired as explained in the Manual (Appendix H, page 9).
Prop the rack and panel assembly open at a 90 degree angle as shown, and routing the wires between the other PC boards, wire up the NTO/VCO board. The pad connections to this board are indicated with a small "v" on the wiring diagram.
Cut 6 one inch pieces of insulated wire and strip one quarter inch of insulation off each end of all six wires. These wires are used to interconnect the two piggy backed boards. The six pad interconnections are shown on the lower left of the wiring diagram. These pads are all on the edge of the two boards, and when positioned with the NTO/VCO on top of the NTO/CON (The NTO/CON is closest to the panel when the rack is mounted in position), these pads should line up and can be easily connected with the six-pieces of wire. Next install the stand offs between the boards (only two are needed, make sure that they aren't installed in holes which will be used to mount the rack on the panel).
SELF TEST PROCEDURE: Check to verify that all outputs are the proper waveforms. This can be done by ear (sine=purest with no overtones; trianqle=sliqhtly reedy; sawtooth=rich in harnonics) .The variable waveform should produce richly varied harmonic content when turning the pot or with a CV. The frequency range should go from sub-audio to near the limit of perceptible frequencies in the hiqh range. FM modulation should be checked with an input from another oscillator and a CV from a slew into the FM control input. Check portamento operation, I volt/octave and IN/AUX inputs. Using a sawtooth waveform from another oscillator, check that the SYNC connection will lock the NTO to the other oscillator's frequency.