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System A - 100

Dual S&H A-148

1. Introduction

Module A-148 (Dual S&H) has two identical sample &

hold modules, designed to produce ‘staircase’ volta-

ges.

The signal present at the sample input (voltage range

-8V...+8V) is sampled at a rate set by the signal at the

trigger input, and held at that voltage at the S&H

output.

The exact shape of the staircase depends on the sort

of waveform at the sample input: NOISE or RANDOM

signals produce random patterns; an LFO produces

rising or falling staircase patterns.

Two LEDs for each S&H indicate the voltage (positive

or negative) of the sampled signal.

From August 2005 an improved version of the module

is manufactured: For each sub-module the operation

mode S&H (sample&hold) or T&H (track&hold) can

be selected by a jumper. In T&H mode the output si-

gnal follows the input signal while the trigger input is

"high". As soon as the trigger input turns to "low" the

last voltage is stored. The factory setting is S&H for

the upper device and T&H for the lower device. In ad-

dition the complete A-100 voltage range -12...+12V

can be processed (no longer limited to -8...+8V as for

the previous version).

Trig. In

Smp. In

S&H Out

Control

Trig. In

Smp. In

S&H Out

A-148

DUAL S&H

Control

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer Dual S&H A-148 1. Introduction A-148 DUAL S&H Trig. In Smp. In Control S&H Out Trig. In Smp. In Control S&H Out Module A-148 (Dual S&H) has two identical sample & hold modules, designed to produce ‘staircase’ voltages. The signal present at the sample input (voltage range -8V...+8V) is sampled at a rate set by the signal at the trigger input, and held at that voltage at the S&H output.
PAGE 2
A-148 Dual S&H System A - 100 doepfer Indicators: 2. Overview 1 LEDs: sampled voltage status indicators A-148 DUAL S&H ➊ Trig. In ➋ Smp. In ➌ S&H Out Ctr. In / Outputs: - + - + Trig. In Smp. In S&H Out Ctr.
PAGE 3
doepfer System A - 100 3. Indicators 1 LEDs These LEDs give a visual indication of the voltage level of the sampled and held signal (- LED: negative voltages, + LED: positive voltages). 4. In / Outputs Dual S&H A-148 For the new version of the module manufactured from August 2005 the complete A-100 voltage range can be processed (i.e. -12...+12V). § S&H Out The ‘sampled and held’ voltage is available at the S&H output (see Fig. 1). Fig.
PAGE 4
A-148 Dual S&H System A - 100 P 5. User examples Random arpeggios In the example in Fig. 2, an A-118 is used in conjunction with the A-148 to produce random voltages from the random output of the A-118. An LFO triggers the S&H module, so that with every oscillation of the LFO a new random voltage is output to the VCO’s CV input. If you patch an A-130 VCA in before the VCO, you can adjust the Gain and Out amounts to restrict the frequency range of the random voltages to whatever you want.
PAGE 5
System A - 100 doepfer CV A-170 S&H Dual S&H A-148 VCO LFO Abb. 3: Glissando P If you like you can patch the gate signal to the reset input of the LFO, so that its waveform starts at the beginning for each note. Instead of an LFO, you can also use the MIDI-Clock from a MIDI-CV interface. That will produce glissandi synced to MIDI. Random filter settings per note With the patch in Fig. 4, every time a keyboard gate voltage is received, a new random filter CV is sent out.
PAGE 6
A-148 Dual S&H System A - 100 6. Function of the jumpers (only for the new version manufactured from 2005) By means of the jumpers JP2 and JP3 the operation mode can be chosen (S&H or T&H). The factory setting is S&H for the upper device and T&H for the lower device.