# Smooth 12V pwm signal running at 4 KHz

I'm making a fermentation chamber using a Peltier element (TEC1-12706). As recommended by the data-sheet ($V_{max} = 14.4 V, I_{max} = 6.4 A$), I'm using a 12V/3A 4 kHz PWM power supply.

I want to smooth/filter PWM output (e.g., RC circuit) so as to increase the lifetime of the Peltier element. The problem is that I also need to reverse the current direction (for fast heating & fast cooling).

How can this be done?

• Check out H-bridge. – Dmitry Grigoryev Jun 28 '17 at 14:58