True Random Number Generators (TRNGs) are essential in all security systems. Unfortunately, large design effort is required to ensure that a TRNG design on a Field-Programmable Gate Array (FPGA) generates a sufficient entropy density at its output. This design effort relates to the fact that for each FPGA family a manual placement and routing procedure has to be executed. On top of this often comes the additional effort of finding a suitable location inside the target FPGA. This searching procedure has to be repeated for every device separately. In this demo, we show the working of a novel entropy source for the Coherent Sampling Ring Oscillator (COSO) based TRNG. This entropy source eliminates the need for any manual intervention during the implementation process. It generates two oscillating signals that can be matched with a precision of a few picoseconds. A controller regulates this entropy source based on some predefined bounds on the period length difference of the two oscillating signals.