Easy Schmitt Square Wave Oscillator

The capacitor and pin 7 go to ground.

Put oscilloscope probe near pin 2.

Capacitor is ceramic 100nF (0.1uF).

Resistor is 100K ohms.

Voltage is 2.5vDC.

Here it is running: 

Cardioid curve heart-shaped push latch

This is a Cardioid Curve Latch I made for Valentine's Day.

I made this Cardioid curve push push latch with my new milling machine and drill press. The straightaway is lower than the diagonal path so the pointer can't go up the diagonal, only down it on the return.

Scrap aluminum, wd-40 as cutting fluid. Little Machine Shop manual mill.

Angles milled by just turning the rotating base machine vise and locking it down again for each angle. 

I saw This Old Tony make a similar one (though he used a CNC machine) and figured if I changed the return curve to a properly angled diagonal I could make it with my manual mill.

Cardioid = heart-shaped

I was avoiding a cardio workout from shoveling snow.

Happy Valentine's Day 2022!