The relative phase and frequency stabilization setups for diode lasers are discussed. The construction and performance of an optical phase lock loop based on integrated phase-locked loop chips are shown along with practical tips facilitating its preparation. The interference pattern between two electronically locked lasers is shown as a proof of the system stability. The fringes contrast is a quantitative indicator of the mean-square phase error. Finally, an example of a very simple frequency offset lock realized with an all-in-one radio chip is also provided.