Metallic clearing electrodes have been designed to absorb the photo-electrons in the DAΦNE positron ring. They have been inserted in the wiggler and dipole vacuum chambers and have been connected to external high voltage generators. In the paper we present the design of the devices and the results of the electromagnetic simulations of longitudinal beam coupling impedances. We also present the results of the RF tests on the installed electrodes. INTRODUCTION The Frascati Φ-factory DAΦNE is an ee collider operating at the energy of Φ-resonance (1.02 GeV c.m.) [1]. The main machine parameters in the last run for SIDDHARTA experiment and the crab waist collision scheme test [2] are given in Table 1. One of the main limitations in the maximum stored current of the e ring has been identified as a horizontal instability due to the e cloud effect [3]. To mitigate such instability metallic (copper) electrodes have been inserted in all dipole and wiggler chambers of the machine and have been connected to external dc voltage generators in order to absorb the photo-electrons [9]. Simulations of the e cloud density and instability threshold with and without the voltage applied to the electrodes are widely discussed in [4]. With a dc voltage of 500 V applied to each electrode we expect a reduction of such density by two orders of magnitude that will contribute to reduce substantially the source of the instability. Table 1: DAΦNE Parameters (last 2009 run)