Tiptop Audio Buchla 245t Sequential Voltage Source

SEQUENTIAL VOLTAGE SOURCE - MODEL 245t

Buchla 245t has two sections: Pulser and Stored Voltage Stages.

The Pulser generates a control pulse which can be used to advance the stages in the Voltage Stage section.

The Voltage Stage section has 5 stages that store 4 voltages per stage.

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

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
• Stop 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