Bench thermometer (CB20501E)

With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a 1991 documentation.

STEVAL MKI139V5 MEMS Microphones
August 2017 - Mouser Electronics is making STMicroelectronics' Analog and Digital MEMs available in a...
Biofeedback Thermometer (CB24401E)
This circuit was found in February 1976, Radio Electronics magazine. The circuit is quite...
Transistor flasher (CB9785E)
This circuit has a very traditional configuration that can be found elsewhere on the site. R2 and...