High Voltage Driver Board - Rev. 1.0

This board has four independant high voltage drivers. These boards were designed to drive pinball machine solenoids, but their use is not limited to pinball machines. These boards can als be used to drive high power LEDs, DC motors, etc... As long as the used IRL540 MOSFETs are able to provide enough power to the device being driven. The MOSFETs are driven by the PC817 opto-couplers, so the digital inputs are isolated from the high-power section.

The outputs can be configured in two ways. Every output can be exposed by a separate 2-pin connector, or two outputs can be joined together into a 3-pin connector. This is useful for flipper solenoids.

Pin 1 (marked by the square footprint) on J1 is the common ground pin. Pin 1 on jumper J2 is +5V, pin 2 is ground, and pin 3 is +25V to max. +75V.

Warning: These designs are made as part of a hobby project and thus come with no guarantees. Do not use these designs in for any critical systems! Working with voltages higher than +40V can be potentially dangerous, please take appropriate safety measures!

BOM

Identifiers	Quantity	Part
D1	1x	5mm red LED
D2 - D5	4x	1N4004 compatible diode
J1	1x	JST XH connector, 2.5mm pitch, 5-way, through-hole
J2	1x	CH 3.96 connector, 3-way, through hole
J3 - J6		CH 3.96 connector, 2x 3-way or 4x 2-way, through-hole
Q1 - Q4	4x	IRL540 MOSFET
R1 - R4	4x	51Ω 0.25W resistor
R5	1x	470Ω 0.25W resistor
R6 - R9	4x	1kΩ 0.25W resistor
U1 - U4	4x	PC817 Sharp opto-coupler

Pictures