Prototype shown - current release includes footprint for MOTM style conenctors

Due to the rather heavy usage of bypass capacitors in the synth and diy scene some shortcomings of commercial power supplies have come to light. The most frequent is the failure of one or both power rails to come up at power-on, caused by the initial demand of all the bypass capacitors. The power supplies sense this as an overload and shut down.

If modules were brought on-line in groups instead of all at once, the power-up surges would be limited to what the power supply can handle. Of course, once a group of modules has started, its current demands are less, allowing ample capacity for the supply to start another group of modules.

The CGS763 - Power Supply Delay does exactly that. After a predetermined time, it closes a set of relay contacts, powering the modules connected to it.

There is another advantage to doing this as well. The power supply has started and settled before modules are connected to it, giving them a cleaner power-on, and thus a cleaner reset signal for those modules that use a power supply based reset.

The delay is adjustable, so as more modules are added, extra Power Supply Delays can be added, adjusted to different times to keep the start-up load distributed.

When wiring the power feed to the CGS763 it is better to have each one wired directly from the power supply in a "star" configuration rather than connecting themin series.

The CGS763 is fitted with 4 x Doepfer compatible 16-way IDC open headers*. 2 LED's provide a status of the two main power rails. Connection from the power supply to the CGS763 is via a 3-way screw terminal block. A 4-way 0.1" header is provided for systems that require to use the 5V power rail and/or the common-control-lines. A connector at the right-hand end (not shown in the photograph) allows the number of delay outputs to be increased by adding a CGS73 Distribution board (or similar).

The CGS763 measures 182cm x 41cm so 2 can be fitted end-to-end along the back of a standard 19" rack providing support for up to 8 modules in a 3U section.

The CGS763 can be, alternatively, fitted with 0.156" conenctors to allow the module to be used in systems such as MOTM, Oakley and FracRack.

* We recommend the use of box headers to provide optimum orientation/polarisation of power cables. However, not all 3rd-party power cables are correctly terminated with the stripe at Pin 1 of the socket - extreme caution must be used when isntalling these cables to ensure the correct power supply routing.