This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all components are common. The transformer is 12 + 12 V with at least 1 A and the diodes 1N4002.
This circuit for discharging NiCad batteries limits the current to a value that can be adjusted in the...
This circuit found in a 90s Popular Electronics, triggers a huge array of LEDs from the sounds...
Found in an Electronic Design from the 90s, this circuit uses a component of the time, difficult...