AM928 Sample & Hold

Eurorack compatible clone of the Moog 928 sample and hold circuit.

This is a recreation of the Moog 928 Sample and Hold module. The Moog Modular synthesizers were launched in the 1960's without a sample and hold circuit, and only when ARP popularized this circuit in the 2600 and Odyssey did Moog introduce one, around 1975.
The Moog circuit is different to the ARP design, as it uses CMOS analog switches rather that a JFET to sample the input signal. It has two signal inputs for sampling sources; the X1 input provides unity gain and the X3 provides three times gain. There are two identical outputs.

A precision low frequency clock can be used as the sampling source (INT) or a V-trigger and S-trigger inputs (EXT). The square and triangle outputs of the clock are available on the front panel with a green LED indicating the internal clock rate.

The module has potentiometers for the internal clock rate and glide rate, and a slide switch to select the internal or an external clock source patched into the S or V-Trigger Inputs. There is also a slide switch to bypass the glide circuit to provide sharp waveform outputs.

The module is designed to complement the Behringer System 55 Modular System.

https://www.amsynthstore.co.uk/AM928_Sample___Hold/p1461448_20938400.aspx