The SNH-12-30-35 spike & hold board is a plug-and-play circuit board designed to generate the spike-and-hold voltage commonly required for solenoid valve applications. Each spike & hold  board can support up to four of Spectronik's HFV-3X-55 Highflow Miniature Valve Modules. The hold voltage can be factory-configured between 3.5-5VDC at the time of order.