614 QUAD LATCH is an analog synthesizer module available as a PCB/panel set for DIY construction. It consists of four identical bistable flip flops. Each has DATA, CLOCK, SET, and RESET inputs and a buffered GATE output (with LED indicator) that toggles between high and low states.

Like all 600 series modules, 614 QUAD LATCH is 20hp (101.3mm) wide. Knobs and panel jacks align to a uniform 20.32mm spacing grid. Power and mounting specifications conform to “Eurorack” standards. PCB construction is single-board and through-hole. Panel is black FR-4 and so might have some minor blemishes from the manufacturing process.

Usage:

With comparators on all inputs, 614 responds to any signal that crosses a 1-volt threshold. The rising edge of a threshold-crossing signal at CLOCK sets GATE high (roughly 5v) or low (0v) depending on the state of the signal at DATA (i.e., if DATA is above 1 volt, GATE goes high; if DATA is lower than 1 volt, GATE goes low). The rising edge of a threshold-crossing signal at SET will force GATE high asynchronously. Vice versa, the rising edge of a threshold-crossing signal at RESET will force GATE low asynchronously.

DATA is normalled to the logical inversion of GATE, meaning that if nothing is patched into DATA, the default operation of each flip flop is as a divide-by-two counter, with GATE going high at every other CLOCK event. CLOCKS 2, 3, and 4 are normalled to the preceding GATE, meaning that if only CLOCK 1 is used, 614 defaults as a a four-stage divider, with GATE 2 going high at every fourth CLOCK 1 event, GATE 3 at every eighth, and GATE 4 at every sixteenth.

Please consult the "bill of materials" for construction notes before ordering.

Resources:

PCB GERBER

SCHEMATIC

BILL OF MATERIALS

SIMULATION