The adaptation of developed metrology-grade ac current source (MCS) in the velocity mode of measurements of the Planck-Balance 2 (PB2) as a means for generating ac mechanical oscillations is presented. The universality in operating with the MCS unit especially practical to Planck-Balance setup for frequencies of 0.1 Hz to 20 Hz (including but not limited to the negligence of a broader range of 0.01 Hz up to several hundred Hz) and for amplitudes of up to 10 mA with 16(offset with 14)-bit effective resolution is demonstrated. The MCS allows generating complex ac waveform signals as a waveform synthesizer by adding to the original signal extra 5 independent harmonic components each of which with an adjustable resolution of 10 ns for phase and 16-bit for amplitude. Additionally, the MCS is supported by an external clock at 10 MHz frequency which serves also as a common reference time base for the comparison between the direct output signal of MCS, or of the induced voltage in the coil of the Planck-Balance resulting due to the applied current by MCS, with the ac quantum voltage standard at the required accuracy levels.