Magnetic Stirrer w/ Hotplate for <$30

Step 3 The Hotplate

Adding the hotplate is very easy! Just add an extra switch and LED to the thermoelectronic cooler to the power supply. Check the schematics if you have questions.

To mount the heater/cooler, identify the heating side and place it face up on the metal. Secure the device with a dot of hot glue. Make sure this is centered above the motor you mounted in the last step.

Comments

[GreenD]

So the hot glue will not melt because the otherside is kept cool correct?

[GreenD]

Last comment:
You have forgotten to mention that your power supply will need >10 amps, which isn't exactly inexpensive (more than 30$) and you also need to lable your amperage amounts on your potentiometers, etc...

[articice]

He also didn't predict that such current running through the LED or a potentiometer would quickly damage it. A thyristor-based (or other kind of power dimming device) regulation is needed.