Doepfer A-148 Dual Sample&Hold - Manual

doepfer System A - 100 Dual S&H A-148
1
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