Tabletop Foam Cutter

Schematic
OpAmp Circuit
Example Cut
More Photos


The cutter uses a series of opamps to generate a PWM signal with a variable duty cycle that drives a power mosfet.

Parts:

* [Power Switch](https://www.amazon.com/gp/product/B01BTTOEQ6/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1)

* 3x 10k Resistors, 2x 4.7k Resistors, 1x 470ohm Resistor

* [10k Potentiometer](https://www.amazon.com/MCIGICM-potentiometer-linear-WH148-Shaft/dp/B0791GYLBZ/)

* .1uF Capacitor

* Red LED

* [30G Nichrome Wire](https://www.amazon.com/gp/product/B06XCBFN6K/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1)

* [LM324AN](https://www.ebay.com/itm/USA-5PCS-National-Semiconductor-LM324AN-LM324-Low-Power-Quad-Op-Amp-New-IC/192575025357)

* [P30N06LE](https://www.amazon.com/Jekewin-N-Channel-Power-Mosfet-220/dp/B071Z98SRG/ref=sr_1_cc_1?s=aps&ie=UTF8&qid=1531936784&sr=1-1-catcorr&keywords=p30n06le)

* [Terminal Blocks](https://www.amazon.com/gp/product/B071DN7GQ5/ref=oh_aui_detailpage_o09_s00?i