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Eggert Jung
2025-11-03 02:21:30 +01:00
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## Vacuum Tweezer
Replacement board for a Quick 381A. Old board died and I wanted to add some features anyway.
![](4096-2304-max.jpg)
#### TODO (for better matching with existing mating parts):
* hole pattern needs to be ~5mm wider
* change connector for footswitch to a 2.54mm one
* change ac input connector to 3.81 one
* change potentiometer connector from 3pin to 2pin with added internal 270k pullup
* optimize PWM duty cycle range
* code is very qnd, but quite usable
#### Connections:
* mains input to transformer primary; cut wires and connect with WAGOs.
* transformer secondary to ac input of pcb
* pump and valve to respective output terminals (cut wires and connect to screw terminals or change pcb to use original 3.81mm connector)
* footswitch
* led (connect to one of the led outputs, power or software controlled led)
* PE lead from the motor to the chassis
* optional: add a mode switch to the frontpanel and connect it with three wires to the remaining switch input connector (can be used to select inverted footswitch mode)