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buchla/tiptop audio
245t: sequential voltage source

price : $245.00



245t: Sequential Voltage Source

tiptop audio's buchla series model 245t sequential voltage source is a faithful recreation of buchla's famed five-stage, four-row sequencer in the eurorack format. one of several 200 series adaptations developed in collaboration with buchla usa, the 245t is a one-to-one replica of the original buchla 245, remade to fit the eurorack standard. divided into two sections, the 245t is comprised of a pulser section (a voltage-controllable clock) with transport controls, as well as the main sequencer section, which offers four rows of highly-customizable five-step sequencing.

the pulser section offers a pulse and "ref" out, a saw wave perfectly in phase with the running clock. the pulse output has a definable length, acting much like a pulse-width control, which itself can be modulated for interesting gating/triggering patterns. the rate at which the pulse cycles is determined via the internal time control, and time shifts for slowing down or speeding up can be applied vai incoming control voltages, complete with an attenuverter at the cv input. additionally, the pulser offers transport controls for start and stop, each with their own manual button control or pulse input for triggering externally.

moving to the sequencing section, four rows labeled a through d each provide five freely assignable stages, allowing you to design several cv sequences for pitch sequencing, filter tracking, or anything your heart desires. you can easily progress linearly through each stage via the advance pulse input, or even select stages out of order by sending a pulse/trigger into one of the stage select inputs. combine the stage select inputs with the loop switches for creating selectable mini-sequencing, and introduce inverse, ping-pong, random sequencing, or even crude voltage quantizing with the analog input, which accepts continuous cv signals to sweep through the stages in a non-traditional manner. each stage outputs a trigger pulse, great for activating an envelope, creating new clock signals, or even selecting stages on other 245ts in your system!

bringing the joy of vintage buchla to your eurorack system, the tiptop audio buchla model 245t sequential voltage source is a brilliant sequencing option for creating anything from simple lines to complex, moving cv patterns.

features:
pulser section:
pulse - output generates a pulse with a 10v initial stage that lasts for 100usec (0.1ms) followed by a 5v gate stage length determined by the pulse length control.
ref - outputs a ramp wave that descends from 10v to 0v at the rate of the pulser.
pulse length - sets the length of the 5v stage of the pulse from 0 to 100% of the duty cycle. external cv control is added to the knob setting.
internal time - controls the period of the pulser output from 10 seconds (full cw) to a few milliseconds (full ccw). external cv has an attenuverted control to either add (cw) or subtract (ccw) external voltage from the knob setting. external cv can increase the maximum and minimum period of the pulser to approximately 50 seconds to 1ms (1khz) (*).
start - pressing this button starts generating a pulse and reference ramp at those outputs. a pulse on the start input also begins pulser generation.
stop - pressing the button or sending a pulse to the input jack stops the pulser if already running. additional presses or pulses to the stop input will manually trigger a single pulse output from the pulser.

stored voltage stages:
advance in - accepts a pulse from the pulser or external source (281t eoc for example) and each pulse advances to the next stage from 1 to 5. the switches in the stage select section can control the number of stages played back.
note, with all stage switches in down position playback will be on hold.
stage gate output - each stage has a dedicated gate output that produces a high voltage (10v) when that stage is active. this gate can be used to trigger events like envelopes.
out - the voltage output of the current active stage. each of the outputs has an independent voltage.
stored voltages - 4 rows of 5 locations of stored analog voltages set by a control knob.
analog (in) - cv input (0-10v) that addresses the stages. when the voltage is above the o range the analog input is active and the advance and stage select inputs are disabled. ranges are approximately(*): o (0v - 0.75v), stage 1 (0.75v - 2.5v) stage 2 (2.5v to 4.25v) stage 3 (4.25v to 6v) stage 4 (6v to 7.75v) stage 5 (7.75v to 10v)
stage select inputs - pulses on these 5 inputs will immediately set the active stage to the corresponding input. using these inputs can create a type of analog preset memory for 4 cv settings in your modular system.
stage switches - these 4 switches enable or disable the stage transitions. switch 1 controls stage 1 to 2 transition, switch 2 stage 2 to 3 and so on. by disabling a stage transition the length of the sequence can be shortened or captured.

specifications:
ref out: 0 - 10v
pulser out: 0 to 10v
pulse length: cv 0 - 10v
internal time: cv 0 - 10v
start pulse in: 0 - 10v
advance in: 0 - 10v
analog in: 0 - 10v
stage select in: 0 - 10v
stored voltage out: 0 - 10v
stage gate out: 0 - 10v
size: 30hp
depth: 25mm
power: +12v 63ma / -12v 28ma

* note: due to the analog nature of the design specifications for pulser timing and length and analog in will slightly vary from unit to unit.

download the users manual here.

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