Doepfer A-170 Dual Slew Limiter

Dual portamento and AR envelope shaping

8 HP Eurorack module

The A-170 Dual Slew Limiter is a portamento and envelope shaping module containing two independent slew limiters that smooth abrupt voltage transitions into gradual glides. The upper SL offers a single joint rise/fall time control ideal for precision portamento, while the lower SL provides separate rise and fall controls with a three-position time range switch, making it usable as a simple AR envelope generator with musical sweep and glide effects.

Features

• Two independent slew limiters in one module
• Upper SL: single joint rise/fall time control (0 to 10 seconds)
• Lower SL: separate rise and fall time controls
• Three-position time range switch on lower SL: Low (0~0.5s), Medium (0~10s), High (0~minutes)
• Lower SL usable as simple AR envelope generator
• Two LEDs per slew limiter indicating rising and falling voltage states
• Upper SL recommended for precision 1V/octave portamento work
• Lower SL has diode-based circuit with approximately 0.5V offset, unsuitable for precision pitch CV
• Actual times depend on the amount of voltage change

Controls & Jacks (12)

• In (Upper SL)
• Upper SL Time
• Out (Upper SL)
• - LED (Upper SL)
• + LED (Upper SL)
• In (Lower SL)
• Lower SL Rise Time
• Lower SL Fall Time
• Time Range
• Out (Lower SL)
• - LED (Lower SL)
• + LED (Lower SL)

How-To Guides

• Classic Portamento Glide
• Simple AR Envelope Generator
• Percussive Bass with AR Envelope
• Glissando AM Timbral Sweep
• Ultra-Slow Voltage Morphing
• Complex Sequenced Envelopes
• Dual Portamento for Two VCOs
• Stepped CV Smoothing for VCF

Explore the interactive A-170 Dual Slew Limiter panel on BleepDex — tap any control to learn what it does.