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Check the listing for details. DC12V Upgraded TL494 Inverter Driver Board Front Driver Board Pulse Board. Condition: New. Listed at 14.83 USD. DC12V Upgraded TL494 Inverter Driver Board Front Driver Board Power Pulse Width Modulation Drive Board DIY Inverter Pulse Board. Output frequency: about 30KHz. 12V to 220V Modified Wave Inverter Circuit Board 300W Driver DC12V to AC220V.