Döpfer A184-1 - Ring Modulator / S&H / T&H / Slew Limiter

The upper section is 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 followed by a slew limiter. 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.