Simply CLOCK – the heart of your modular rack, in just 4 HP.

Simply CLOCK is a compact master clock for Eurorack synthesizers, designed and built by BIGZUN. It keeps your sequencers, drum modules, LFOs and envelopes in perfect time – with no knobs to bump and no menus to get lost in. Four buttons, a bright OLED screen and four jacks are all you need.

★ KEY FEATURES

• Internal clock from 1 to 400 BPM – tap for single steps, hold to speed up (steps of 5, then 10)

• CLOCK IN – patch any external clock and Simply CLOCK follows it automatically; when the clock stops, it returns to its own tempo after 2 seconds

• Start on the beat – press START while following an external clock and the module waits, then starts exactly on the next incoming pulse

• RESET IN – starts a new bar instantly; both outputs restart and the divider counts from zero

• CLOCK OUT – one pulse per beat

• CLOCK OUT 2 – divided or multiplied clock: /1024, /512, /256, /128, /64, /32, /16, /8, /4, /2, x2, x4, x8

• Pulse length for both outputs: 50 % GATE or 1, 2, 5, 10, 20, 50 ms trigger – automatically limited to half a period, so pulses never merge

• Tempo shown in BPM or Hz

• Two screen styles: SIMPLY (big LCD-watch digits, readable from across the room) and ADVANCED (clock source, tempo, OUT2 ratio, RUN/STOP/WAIT and output activity at a glance)

• All settings saved automatically – no save button

• Always starts in STOP at power-up, so your system never starts playing on its own

★ CONTROLS & CONNECTIONS

• Inputs: CLOCK IN, RESET IN (5-10 V gate/trigger, protected)

• Outputs: CLOCK OUT, CLOCK OUT 2 (approx. 0 / 5 V, transistor buffered)

• Buttons: UP +, DOWN −, START/STOP, MENU

• Display: 0.91" 128×32 OLED

★ SPECIFICATIONS

• Format: Eurorack 3U, 4 HP

• Power: 10-pin Eurorack power header, +12 V only, reverse-polarity protected

• Tempo range: 1-400 BPM (external clock displayed up to 999 BPM)

• Output timing resolution: 100 µs

• Microcontroller: CH32V003, 32-bit RISC-V, 48 MHz

★ GREAT FOR

• Master clock for a small or medium Eurorack system

• Clock divider / multiplier for an existing clock source

• Second, independent clock in a large system

• Berlin School sequences, generative and ambient patches

A full user manual in English (PDF) is available – a Polish version is available too.

Simply CLOCK is part of the Timewind Project by BIGZUN – handmade Eurorack modules from Poland.