Found in a 1980s German publication, this circuit tests batteries by type. The circuit is based on a range of LEDs of different colors and is given a table with indications for various voltage ranges.
This Linear Technology circuit charges a battery from the energy produced by a wind generator that can...
This circuit was found in the 1967 RCA SCR manual. The circuit generates approximately 300 V at a...
Found in old American documentation, this circuit can divide the frequency of a signal by 2 or 3...