Eurorack Clock Module

This listing is for a eurorack Clock module with the following features:

• Clock module utilising the 555 timer chip
• Rate/speed control
• 3 speed modes selectable by switch
• Stop/Run switch
• LED for visual confirmation of speed
• Reverse power protection
• 4hp width, 20 mm module depth (panel to back of power connector)
• Front panel is made from 1.6 mm FR4 (PCB material)
• Power cable included

Very simple clock module - why waste an LFO when you can used a dedicated clock module instead?

These modules were built by me from publicly available circuits. Please note that this is a relatively simple circuit utilising the 555 timer chip. As such, when using the Stop/Run switch the first trigger pulse is slightly longer than the subsequent ones as the timing capacitor needs time to fill up. After the first beat it is regular as clockwork, as you'd expect. 555-based clocks tend not to include a Stop/Run switch for this reason but seeing as the feature was available I figured why not?

Some additional info

I often find myself needing basic utility modules but struggle to find these at low cost. Most of the ones I find come with additional functionality that I either don't need, or prefer to have in a separate module. So, for me, building my own based on publicly available schematics is the best solution.

Due to minimum order quantities for PCBs I tend to have spares. These spares are the modules I offer for sale here. I enjoy building, so rather than offer the PCBs and front panels up for sale, I sell built modules. I'm not in the business of producing & selling modules (this is a hobby after all) and so there likely won't be any more of these. I want to keep the cost low so I'm selling these for essentially what they cost to build plus a little extra so that I can carry on building other modules for myself. Hopefully they'll be useful if you're looking for some cost-effective utility modules.

These utility modules are built around basic functionality with no bells and whistles as I prefer utility modules in my rack to do a simple job. You'll definitely be able to find more fully featured modules out there that take up less rack space if thats what you are looking for. But if you want a simple, single function module then this will definitely fit the bill.

The modules have all been tested in my system to check they work as they should. The power header is keyed to help with orienting the power cable (red stripe to -12V). Reverse power protection is built in to the circuit.