Low temperature sensor (CB7814E)

Found in 90s Radio Electronics, this circuit is indicated for reading temperatures below zero.

600mA DC-DC Converter (CB1243E)
The circuit shown in the figure is suggested by Intersil (www.intersil.com) and makes use of the...
Tachometer (CB4960E)
We found this version of the automotive tachometer in a 1980s publication. Variations from other...
Motorcycle or Car Battery Charger (CB18939E)
The battery charger shown in the figure uses two 60 W incandescent bulbs in series to limit the...