Doefper — A-148
Doepfer A-148 Dual S&H Manual PDF
Doepfer A-148 Dual S&H – Cheat Sheet
Quick Overview
The Doepfer A-148 is a dual Sample & Hold (S&H) and Track & Hold (T&H) module. It can generate random or stepped voltages for controlling other modules. Each of the two identical sections can be independently set to S&H or T&H by internal jumpers (for modules manufactured from Aug 2005 on).
Panel Controls & Features
| Label |
Type |
Function |
Voltage Range |
| Trig In |
Jack |
Input for the trigger signal (sampling clock) |
Any A-100 trigs/gates |
| Smp In |
Jack |
Input for the signal to be sampled/held |
-12V ... +12V |
| S&H Out |
Jack |
Output for the sampled and held (or tracked and held) voltage |
-12V ... +12V |
| LEDs |
Visual |
Shows the polarity of the output voltage (+ LED: positive, - LED: negative) |
N/A |
| Jumper (int.) |
Header |
Sets upper/lower circuit to S&H or T&H mode (default: Upper = S&H, Lower = T&H) |
N/A |
How it Works
- Sample & Hold (S&H): At each positive edge on Trig In, the voltage at Smp In is "captured" and held until the next trigger.
- Track & Hold (T&H): The output follows the input while Trig In is high; when Trig In goes low, it holds the last value.
Input/Output Reference
Inputs
- Trig In
- Type: Gate/Trigger input
- Purpose: Determines when to sample Smp In
- Smp In
- Type: CV/Audio input
- Purpose: Signal to be sampled or tracked
- Voltage Range: -12V to +12V (modules after Aug 2005; previous versions: -8V to +8V)
Outputs
- S&H Out
- Type: CV output
- Purpose: Output the last sampled/tracked value
- Voltage Range: Follows input within -12V to +12V (post-2005)
Typical Patch Examples
- Random Arpeggios:
- Patch white noise (A-118) to Smp In, LFO to Trig In, S&H Out to VCO CV.
- Glissando:
- Keyboard CV through slew limiter to Smp In, LFO to Trig In, S&H Out to VCO CV.
- Random Filter:
- Noise to Smp In, keyboard gate to Trig In, S&H Out to filter CV input.
Version Differences & Jumpers
- Pre-Aug 2005: Max input/output voltage range -8V to +8V.
- Post-Aug 2005: Full A-100 range, -12V to +12V, and S&H/T&H selectable via jumpers JP2 (upper), JP3 (lower).
Useful Tips
- LEDs helpful for monitoring whether the last held voltage is positive or negative.
- Voltage Range: Always ensure input voltages are within Doepfer’s -12V to +12V standard.
- Mode Setting: Factory default is S&H (upper), T&H (lower).
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