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Doepfer A-148 Dual Sample And Hold

Dual Sample & HoldModule A-148 (Dual S&H) has two identical sample & hold modules, designed to produce ‘staircase’ voltages. The signal present at the sample input is sampled at a rate set by the signal at the trigger input, and held at that voltage at the S&H output.

The shape of the staircase voltage generated by the S & H module depends on the shape of the signal applied to the sample input: random staircase patterns arise e.g. In the case of NOISE or RANDOM; Ascending and descending stairs are produced e.g. When an LFO signal is present. Two LEDs per unit are used to control the sampled voltage value (positive or negative). S & H units are often used to control the frequency of filters. In conjunction with a MIDI interface (A-190) and a clock divider (A-160), the S & H stages can be controlled in MIDI-synchronous mode.

With each of the two sub-modules, a jumper can be used to determine whether the unit in question is a sample & hold or track & hold. In Track & Hold, the output signal follows the input signal as long as the trigger signal is "high". If the trigger signal goes low, the last analog voltage is stored.

  • Two independent sample and hold circuits
  • Each sample and trigger input
  • Two LEDs per unit for the control of the sampled voltage value (positive or negative)
  • Power requirements: 20 mA (12 V) / -20 mA (-12V)
  • Width: 4 TE / 20.0 mm
  • Depth: 30 mm (measured from the rear of the front plate)

Informações adicionais

Module Yes
Empty Rack, Or Housing No
Basic System No
Accessories No
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A versatile little module

Zoë, 10.03.2014
This module contains two identical parts, either of which can be set to either sample and hold or track and hold by moving its jumper. By default, you get one of each.

I'm not aware of just how much sample and hold units can vary in quality, although this pair certainly does the job. When it comes to features, Doepfer comes out on top again, as track and hold units are certainly rarer.

Using (A-118) white noise as a sample input and an LFO as a trigger input, you can create the random LFO setting found on classic monosynths like the Roland SH and Yamaha CS ranges. Being modular, you can also put it to other creative uses. For instance, it can emulate the sound of a low fidelity digital sampler, akin to bitcrushing, with a sample rate you can dynamically tweak.

This is one of those small, basic utility modules (along with the A-114 ring modulator and A-150 voltage controlled switch) that are about as useful as you are imaginative. They can greatly expand the possibilities of your A-100 just as long as you can use them creatively.
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Hidden arpeggiator

26.10.2016
Most of us will think of a sample and hold in terms of random generated sounds from bleeps to gurgling streams but it can also be used to generate melodies and arpeggios.

I connect an lfo set to square wave as a trigger for sampling.
I use another lfo set to sine wave as sample input, play around with the frequency. The output is fed to either the cv in of a vco or the fm in of a vco if you have one. Play around with these as they give different effects. The key is to experiment with the lfo sample rate which takes you from arpeggio like patterns to random patterns. That's just with one of the sample and hold sections and we have two to play with and the only limit there is your imagination. Thanks Doepfer!
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