Supplemental board for sPWM v3.

What you need: -Omron B3SL-1002P or similar tac switch or external switch of your choice -11 male pin headers, 2.54mm pitch -Model 93 pot (for onboard use) or 2 switches of your choice for the pot wiring -LED or 3-wire VM -6mm Standoffs -screws of appropriate size (i.e. M1.6) -sPWM v3

The sPWM is sandwiched between this PCB and the enclosure wall, with the mosfet facing the enclosure. Board has a cutout to solder the power wires directly to the sPWM.

small PCB which features a SOT-23 N-fet and 0805 resistor to drive an LED strip

v0.1 - any feedback appreciated!!!

Edit: after several tests, it’s proofed to work fine

The sPWM v3’s LED pin is only capable of 15mA, so here’s a little PCB to add LED strip support. This PCB is intended to be used with 2 tactile switches as up / down buttons.

additional components:

• SOT-23 n-fet (i.e. AO 3422 or similar)
• 100k 0805 resistor (optional, only if MosMax' supplemental board or a master on/off switch is used)
• 2.54 pitch male connection headers (https://www.digikey.com/product-detail/en/harwin-inc/M20-9990446/952-2266-ND/3728230)

Wiring:

• “LEDs+”: LED strip’s positive
• “LEDs-”: LED strip’s negative
• “GND”: wires coming from up/down tac switches, switch and black VM wire
• “VMr”: red VM wire
• “VMy”: yellow VM wire
• “Vin”: battery+
• “Pot+”: wire from UP tac switch
• “Pot-”: wire from DOWN tac switch
• “Sw”: wire from switch
• use standard 2.54mm pitch headers to solder on the sPWM v3 by Voltrove (Mosfet facing up!)
• if using an LED instead of a voltmeter, solder LED+ to VMr, leave VMy free
• all wires are routed to the left

adds a slightly bigger footprint to the v3

Links:

-MosMax sPWM v3 supplemental board

-Smart PWM Mods group on Facebook

-sPWM v3 documents