Doepfer A184-1 Ring Modulator S+H/T&H Slew Limiter module [2nd Hand]

Module A-184-1 is the combination of three functions: 

• Ring Modulator
• Sample&Hold/Track&Hold unit
• Slew Limiter

The same functions are actually already available in other modules (e.g. A-114, A-148, A-170). But in many systems it’s not necessary to have two ring modulators (A-114) or two S&H units (A-148) or two slew limiters (A-170) available. That’s why we have compiled these function in one small 4 HP module.
The upper section is nothing but half of an A-114, i.e. a ring modulator with the usual X/Y inputs and the X*Y output.
The lower section is a Sample & Hold (S&H) / Track & Hold (T&H) unit (same as half of an A-148) followed by a slew limiter (same as the upper section the A-170). A toggle switch is used to set the mode to S&H or T&H. In S&H mode the unit picks out a sample from the voltage at the SH input at the rising edge of the trigger signal input. In T&H mode the output follows the input voltage as long as the level of the trigger signal is high. As soon as the trigger signal turns low, the last voltage is stored. The trigger input is internally normalled to high, i.e. the unit works just as a slew limiter in T&H mode when no trigger signal is applied.